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@@ -908,3 +908,8 @@ videochat2/lib/python3.10/site-packages/tensorflow/compiler/tf2xla/ops/_xla_ops.
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+videochat2/lib/python3.10/site-packages/torch/lib/libc10_cuda.so filter=lfs diff=lfs merge=lfs -text

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videochat2/lib/python3.10/site-packages/torch/include/c10/core/Allocator.h

@@ -0,0 +1,319 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <memory>
+#include <utility>
+
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Exception.h>
+#include <c10/util/ThreadLocalDebugInfo.h>
+#include <c10/util/UniqueVoidPtr.h>
+
+namespace c10 {
+
+// A DataPtr is a unique pointer (with an attached deleter and some
+// context for the deleter) to some memory, which also records what
+// device is for its data.
+//
+// nullptr DataPtrs can still have a nontrivial device; this allows
+// us to treat zero-size allocations uniformly with non-zero allocations.
+//
+class C10_API DataPtr {
+ private:
+  c10::detail::UniqueVoidPtr ptr_;
+  Device device_;
+
+ public:
+  // Choice of CPU here is arbitrary; if there's an "undefined" device
+  // we could use that too
+  DataPtr() : ptr_(), device_(DeviceType::CPU) {}
+  DataPtr(void* data, Device device) : ptr_(data), device_(device) {}
+  DataPtr(void* data, void* ctx, DeleterFnPtr ctx_deleter, Device device)
+      : ptr_(data, ctx, ctx_deleter), device_(device) {}
+  void* operator->() const {
+    return ptr_.get();
+  }
+  void clear() {
+    ptr_.clear();
+  }
+  void* get() const {
+    return ptr_.get();
+  }
+  void* mutable_get() {
+    return ptr_.get();
+  }
+  void* get_context() const {
+    return ptr_.get_context();
+  }
+  void* release_context() {
+    return ptr_.release_context();
+  }
+  std::unique_ptr<void, DeleterFnPtr>&& move_context() {
+    return ptr_.move_context();
+  }
+  operator bool() const {
+    return static_cast<bool>(ptr_);
+  }
+  template <typename T>
+  T* cast_context(DeleterFnPtr expected_deleter) const {
+    return ptr_.cast_context<T>(expected_deleter);
+  }
+  DeleterFnPtr get_deleter() const {
+    return ptr_.get_deleter();
+  }
+  /**
+   * Compare the deleter in a DataPtr to expected_deleter.
+   * If it matches, replace the deleter with new_deleter
+   * and return true; otherwise, does nothing and returns
+   * false.
+   *
+   * In general, it is not safe to unconditionally set the
+   * deleter on a DataPtr, because you don't know what
+   * the deleter is, and thus will have a hard time properly
+   * disposing of the deleter without storing the original
+   * deleter (this is difficult to do, because DeleterFnPtr
+   * is not a closure, and because the context on DataPtr is
+   * only a single word, you generally don't have enough
+   * space to store both the original deleter and its context).
+   * However, in some cases, you know /exactly/ what the deleter
+   * is, and you have a new deleter that manually wraps
+   * the old one.  In this case, you can safely swap the deleter
+   * after asserting that the deleters line up.
+   *
+   * What are the requirements on new_deleter?  It must still
+   * properly dispose of the void* pointer passed in as its argument,
+   * where void* is whatever the context of the original deleter
+   * is.  So in general, you expect the new deleter to look something
+   * like this:
+   *
+   *      [](void* ptr) {
+   *        some_new_stuff(ptr);
+   *        get_orig_allocator()->raw_deleter(ptr);
+   *      }
+   *
+   * Note that it won't work to close over the original
+   * allocator; you don't have enough space to do that!  Also,
+   * it's unsafe to assume that the passed in pointer in
+   * question is the memory pointer in question; it might not
+   * be; be sure to read the source code of the Allocator
+   * in question to confirm this.
+   */
+  C10_NODISCARD bool compare_exchange_deleter(
+      DeleterFnPtr expected_deleter,
+      DeleterFnPtr new_deleter) {
+    return ptr_.compare_exchange_deleter(expected_deleter, new_deleter);
+  }
+  Device device() const {
+    return device_;
+  }
+  // Unsafely mutates the device on a DataPtr.  Under normal use,
+  // you should never actually need to call this function.
+  // We need this for the implementation of the hack detailed
+  // in Note [Masquerading as CUDA]
+  void unsafe_set_device(Device device) {
+    device_ = device;
+  }
+};
+
+// NB: Device is NOT tested for here; a CUDA nullptr is as much a nullptr as a
+// CPU nullptr
+
+inline bool operator==(const DataPtr& dp, std::nullptr_t) noexcept {
+  return !dp;
+}
+inline bool operator==(std::nullptr_t, const DataPtr& dp) noexcept {
+  return !dp;
+}
+inline bool operator!=(const DataPtr& dp, std::nullptr_t) noexcept {
+  return dp;
+}
+inline bool operator!=(std::nullptr_t, const DataPtr& dp) noexcept {
+  return dp;
+}
+
+// Note [raw_allocate/raw_deallocate and Thrust]
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Thrust's support for custom allocators requires us to write something
+// like this:
+//
+//  class ThrustAllocator {
+//    char* allocate(size_t);
+//    void deallocate(char*, size_t);
+//  };
+//
+// This is not good for our unique_ptr based allocator interface, as
+// there is no way to get to the context when we free.
+//
+// However, in some cases the context is exactly the same as
+// the data pointer.  In this case, we can support the "raw"
+// allocate and deallocate interface.  This is what
+// raw_deleter signifies.  By default, it returns a nullptr, which means that
+// the raw interface is not implemented.  Be sure to implement it whenever
+// possible, or the raw interface will incorrectly reported as unsupported,
+// when it is actually possible.
+
+struct C10_API Allocator {
+  virtual ~Allocator() = default;
+
+  virtual DataPtr allocate(size_t n) = 0;
+
+  // Clones an allocation that came from this allocator.
+  //
+  // To perform the copy, this function calls `copy_data`, which
+  // must be implemented by derived classes.
+  //
+  // Note that this explicitly ignores any context that may have been
+  // attached to the input data.
+  //
+  // Requires: input data was allocated by the same allocator.
+  DataPtr clone(const void* data, std::size_t n);
+
+  // Checks if DataPtr has a simple context, not wrapped with any out of the
+  // ordinary contexts.
+  virtual bool is_simple_data_ptr(const DataPtr& data_ptr) const;
+
+  // If this returns a non nullptr, it means that allocate()
+  // is guaranteed to return a unique_ptr with this deleter attached;
+  // it means the rawAllocate and rawDeallocate APIs are safe to use.
+  // This function MUST always return the same BoundDeleter.
+  virtual DeleterFnPtr raw_deleter() const {
+    return nullptr;
+  }
+  void* raw_allocate(size_t n) {
+    auto dptr = allocate(n);
+    AT_ASSERT(dptr.get() == dptr.get_context());
+    return dptr.release_context();
+  }
+  void raw_deallocate(void* ptr) {
+    auto d = raw_deleter();
+    AT_ASSERT(d);
+    d(ptr);
+  }
+
+  // Copies data from one allocation to another.
+  // Pure virtual, so derived classes must define behavior.
+  // Derived class implementation can simply call `default_copy_data`
+  // to use `std::memcpy`.
+  //
+  // Requires: src and dest were allocated by this allocator
+  // Requires: src and dest both have length >= count
+  virtual void copy_data(void* dest, const void* src, std::size_t count)
+      const = 0;
+
+ protected:
+  // Uses `std::memcpy` to copy data.
+  // Child classes can use this as `copy_data` when an alternative copy
+  // API is not needed.
+  void default_copy_data(void* dest, const void* src, std::size_t count) const;
+};
+
+// This context is used to generate DataPtr which have arbitrary
+// std::function deleters associated with them.  In some user facing
+// functions, we give a (user-friendly) interface for constructing
+// tensors from external data which take an arbitrary std::function
+// deleter.  Grep for InefficientStdFunctionContext to find these
+// occurrences.
+//
+// This context is inefficient because we have to do a dynamic
+// allocation InefficientStdFunctionContext, on top of the dynamic
+// allocation which is implied by std::function itself.
+struct C10_API InefficientStdFunctionContext {
+  void* ptr_;
+  std::function<void(void*)> deleter_;
+  InefficientStdFunctionContext(void* ptr, std::function<void(void*)> deleter)
+      : ptr_(ptr), deleter_(std::move(deleter)) {}
+  ~InefficientStdFunctionContext() {
+    if (deleter_) {
+      deleter_(ptr_);
+    }
+  }
+  static DataPtr makeDataPtr(
+      void* ptr,
+      std::function<void(void*)> deleter,
+      Device device);
+};
+
+/** Set the allocator for DeviceType `t`. The passed in allocator pointer is
+ *  expected to have static lifetime; this function does NOT take ownership
+ *  of the raw pointer. (The reason for this is to prevent existing pointers
+ *  to an allocator of a particular device from being invalidated when
+ *  SetAllocator is called.)
+ *
+ *  Also note that this is not thread-safe, and we assume this function will
+ *  only be called during initialization.
+ *
+ *  The 'priority' flag is introduced when we want to overwrite the default
+ *  allocator, since the allocators are set statically. The default priority
+ *  is 0, which means the lowest. Only higher or equal priority can overwrite
+ *  existing ones.
+ */
+C10_API void SetAllocator(DeviceType t, Allocator* alloc, uint8_t priority = 0);
+C10_API Allocator* GetAllocator(const DeviceType& t);
+
+template <DeviceType t>
+struct AllocatorRegisterer {
+  explicit AllocatorRegisterer(Allocator* alloc) {
+    SetAllocator(t, alloc);
+  }
+};
+
+#define REGISTER_ALLOCATOR(t, f)                       \
+  namespace {                                          \
+  static c10::AllocatorRegisterer<t> g_allocator_d(f); \
+  }
+
+// An interface for reporting thread local memory usage
+// per device
+struct C10_API MemoryReportingInfoBase : public c10::DebugInfoBase {
+  MemoryReportingInfoBase();
+  ~MemoryReportingInfoBase() override = default;
+
+  /**
+   * alloc_size corresponds to the size of the ptr.
+   *
+   * total_allocated corresponds to total allocated memory.
+   *
+   * total_reserved corresponds to total size of memory pool, both used and
+   * unused, if applicable.
+   */
+  virtual void reportMemoryUsage(
+      void* ptr,
+      int64_t alloc_size,
+      size_t total_allocated,
+      size_t total_reserved,
+      Device device) = 0;
+
+  virtual void reportOutOfMemory(
+      int64_t alloc_size,
+      size_t total_allocated,
+      size_t total_reserved,
+      Device device);
+
+  virtual bool memoryProfilingEnabled() const = 0;
+};
+
+C10_API bool memoryProfilingEnabled();
+C10_API void reportMemoryUsageToProfiler(
+    void* ptr,
+    int64_t alloc_size,
+    size_t total_allocated,
+    size_t total_reserved,
+    Device device);
+
+C10_API void reportOutOfMemoryToProfiler(
+    int64_t alloc_size,
+    size_t total_allocated,
+    size_t total_reserved,
+    Device device);
+
+// used to hold traceback information in allocators
+struct GatheredContext {
+  virtual ~GatheredContext() = default;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/AutogradState.h

@@ -0,0 +1,72 @@
+#pragma once
+
+#include <c10/macros/Export.h>
+
+namespace c10 {
+
+// Structure used to pack all the thread local boolean
+// flags used by autograd
+struct C10_API AutogradState {
+  static AutogradState& get_tls_state();
+  static void set_tls_state(AutogradState state);
+
+  AutogradState(
+      bool grad_mode,
+      bool inference_mode,
+      bool fw_grad_mode,
+      bool multithreading_enabled)
+      : grad_mode_(grad_mode),
+        inference_mode_(inference_mode),
+        fw_grad_mode_(fw_grad_mode),
+        multithreading_enabled_(multithreading_enabled),
+        view_replay_enabled_(false) {}
+
+  void set_grad_mode(bool enabled) {
+    grad_mode_ = enabled;
+  }
+
+  void set_fw_grad_mode(bool enabled) {
+    fw_grad_mode_ = enabled;
+  }
+
+  void set_inference_mode(bool enabled) {
+    inference_mode_ = enabled;
+  }
+
+  void set_multithreading_enabled(bool multithreading_enabled) {
+    multithreading_enabled_ = multithreading_enabled;
+  }
+
+  void set_view_replay_enabled(bool view_replay_enabled) {
+    view_replay_enabled_ = view_replay_enabled;
+  }
+
+  bool get_grad_mode() const {
+    return grad_mode_;
+  }
+
+  bool get_fw_grad_mode() const {
+    return fw_grad_mode_;
+  }
+
+  bool get_inference_mode() const {
+    return inference_mode_;
+  }
+
+  bool get_multithreading_enabled() const {
+    return multithreading_enabled_;
+  }
+
+  bool get_view_replay_enabled() const {
+    return view_replay_enabled_;
+  }
+
+ private:
+  bool grad_mode_ : 1;
+  bool inference_mode_ : 1;
+  bool fw_grad_mode_ : 1;
+  bool multithreading_enabled_ : 1;
+  bool view_replay_enabled_ : 1;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/Backend.h

@@ -0,0 +1,387 @@
+#pragma once
+
+#include <c10/core/DeviceType.h>
+#include <c10/core/DispatchKey.h>
+#include <c10/core/DispatchKeySet.h>
+#include <c10/util/Exception.h>
+
+#include <stdexcept>
+
+namespace c10 {
+
+/**
+ * This legacy enum class defines the set of backends supported by old school,
+ * code generated Type-based ATen.  A "backend" in this sense roughly
+ * corresponds to the cartesian product of (device type, layout), but restricted
+ * only to combinations which we actually have kernels for.  Backend does NOT
+ * include dtype.
+ *
+ * The reason we are sunsetting this enum class is because it doesn't allow for
+ * open registration; e.g., if you want to add SparseXLA, you'd have to
+ * edit this enum; you wouldn't be able to do it out of tree.  DispatchKey is
+ * the replacement for Backend which supports open registration.
+ *
+ * NB: The concept of 'Backend' here disagrees with the notion of backend
+ * exposed to users in torch.backends.  Backend here is something like "CPU"
+ * or "SparseCUDA"; backend in torch.backends is something like "MKL" or
+ * "CUDNN".
+ */
+enum class Backend {
+  CPU,
+  CUDA,
+  HIP,
+  VE,
+  FPGA,
+  IPU,
+  XPU,
+  SparseCPU,
+  SparseCUDA,
+  SparseCsrCPU,
+  SparseCsrCUDA,
+  SparseHIP,
+  SparseVE,
+  SparseXPU,
+  SparsePrivateUse1,
+  SparseCsrHIP,
+  SparseCsrVE,
+  SparseCsrXPU,
+  SparseCsrPrivateUse1,
+  MAIA,
+  XLA,
+  Vulkan,
+  Metal,
+  Meta,
+  QuantizedCPU,
+  QuantizedCUDA,
+  QuantizedXPU,
+  QuantizedPrivateUse1,
+  Undefined,
+  MkldnnCPU,
+  MPS,
+  HPU,
+  Lazy,
+  MTIA,
+  PrivateUse1,
+  NumOptions
+};
+
+inline Backend dispatchKeyToBackend(DispatchKey t) {
+  if (t == DispatchKey::CPU || t == DispatchKey::AutogradCPU) {
+    return Backend::CPU;
+  } else if (t == DispatchKey::CUDA || t == DispatchKey::AutogradCUDA) {
+    return Backend::CUDA;
+  } else if (t == DispatchKey::HIP) {
+    return Backend::HIP;
+  } else if (t == DispatchKey::VE) {
+    return Backend::VE;
+  } else if (t == DispatchKey::FPGA) {
+    return Backend::FPGA;
+  } else if (t == DispatchKey::MAIA) {
+    return Backend::MAIA;
+  } else if (t == DispatchKey::XLA || t == DispatchKey::AutogradXLA) {
+    return Backend::XLA;
+  } else if (t == DispatchKey::Lazy || t == DispatchKey::AutogradLazy) {
+    return Backend::Lazy;
+  } else if (t == DispatchKey::MPS || t == DispatchKey::AutogradMPS) {
+    return Backend::MPS;
+  } else if (t == DispatchKey::Vulkan) {
+    return Backend::Vulkan;
+  } else if (t == DispatchKey::Metal) {
+    return Backend::Metal;
+  } else if (t == DispatchKey::Meta) {
+    return Backend::Meta;
+  } else if (t == DispatchKey::SparseCPU) {
+    return Backend::SparseCPU;
+  } else if (t == DispatchKey::SparseCUDA) {
+    return Backend::SparseCUDA;
+  } else if (t == DispatchKey::SparseHIP) {
+    return Backend::SparseHIP;
+  } else if (t == DispatchKey::SparseVE) {
+    return Backend::SparseVE;
+  } else if (t == DispatchKey::SparsePrivateUse1) {
+    return Backend::SparsePrivateUse1;
+  } else if (t == DispatchKey::SparseCsrCPU) {
+    return Backend::SparseCsrCPU;
+  } else if (t == DispatchKey::SparseCsrCUDA) {
+    return Backend::SparseCsrCUDA;
+  } else if (t == DispatchKey::SparseCsrHIP) {
+    return Backend::SparseCsrHIP;
+  } else if (t == DispatchKey::SparseCsrVE) {
+    return Backend::SparseCsrVE;
+  } else if (t == DispatchKey::SparseCsrPrivateUse1) {
+    return Backend::SparseCsrPrivateUse1;
+  } else if (t == DispatchKey::MkldnnCPU) {
+    return Backend::MkldnnCPU;
+  } else if (t == DispatchKey::QuantizedCPU) {
+    return Backend::QuantizedCPU;
+  } else if (t == DispatchKey::QuantizedCUDA) {
+    return Backend::QuantizedCUDA;
+  } else if (t == DispatchKey::IPU || t == DispatchKey::AutogradIPU) {
+    return Backend::IPU;
+  } else if (t == DispatchKey::XPU || t == DispatchKey::AutogradXPU) {
+    return Backend::XPU;
+  } else if (t == DispatchKey::SparseXPU) {
+    return Backend::SparseXPU;
+  } else if (t == DispatchKey::SparseCsrXPU) {
+    return Backend::SparseCsrXPU;
+  } else if (t == DispatchKey::QuantizedXPU) {
+    return Backend::QuantizedXPU;
+  } else if (t == DispatchKey::QuantizedPrivateUse1) {
+    return Backend::QuantizedPrivateUse1;
+  } else if (t == DispatchKey::HPU || t == DispatchKey::AutogradHPU) {
+    return Backend::HPU;
+  } else if (t == DispatchKey::MTIA || t == DispatchKey::AutogradMTIA) {
+    return Backend::MTIA;
+  } else if (
+      t == DispatchKey::PrivateUse1 || t == DispatchKey::AutogradPrivateUse1) {
+    return Backend::PrivateUse1;
+  } else if (t == DispatchKey::Undefined) {
+    return Backend::Undefined;
+  } else {
+    TORCH_CHECK(false, "Unrecognized tensor type ID: ", t);
+  }
+}
+
+inline DispatchKey backendToDispatchKey(Backend b) {
+  switch (b) {
+    case Backend::CPU:
+      return DispatchKey::CPU;
+    case Backend::CUDA:
+      return DispatchKey::CUDA;
+    case Backend::HIP:
+      return DispatchKey::HIP;
+    case Backend::VE:
+      return DispatchKey::VE;
+    case Backend::FPGA:
+      return DispatchKey::FPGA;
+    case Backend::MAIA:
+      return DispatchKey::MAIA;
+    case Backend::XLA:
+      return DispatchKey::XLA;
+    case Backend::Lazy:
+      return DispatchKey::Lazy;
+    case Backend::IPU:
+      return DispatchKey::IPU;
+    case Backend::XPU:
+      return DispatchKey::XPU;
+    case Backend::SparseXPU:
+      return DispatchKey::SparseXPU;
+    case Backend::SparseCsrXPU:
+      return DispatchKey::SparseCsrXPU;
+    case Backend::SparseCPU:
+      return DispatchKey::SparseCPU;
+    case Backend::SparseCUDA:
+      return DispatchKey::SparseCUDA;
+    case Backend::SparseHIP:
+      return DispatchKey::SparseHIP;
+    case Backend::SparseVE:
+      return DispatchKey::SparseVE;
+    case Backend::SparsePrivateUse1:
+      return DispatchKey::SparsePrivateUse1;
+    case Backend::SparseCsrCPU:
+      return DispatchKey::SparseCsrCPU;
+    case Backend::SparseCsrCUDA:
+      return DispatchKey::SparseCsrCUDA;
+    case Backend::SparseCsrHIP:
+      return DispatchKey::SparseCsrHIP;
+    case Backend::SparseCsrVE:
+      return DispatchKey::SparseCsrVE;
+    case Backend::SparseCsrPrivateUse1:
+      return DispatchKey::SparseCsrPrivateUse1;
+    case Backend::MkldnnCPU:
+      return DispatchKey::MkldnnCPU;
+    case Backend::Vulkan:
+      return DispatchKey::Vulkan;
+    case Backend::Metal:
+      return DispatchKey::Metal;
+    case Backend::Meta:
+      return DispatchKey::Meta;
+    case Backend::QuantizedCPU:
+      return DispatchKey::QuantizedCPU;
+    case Backend::QuantizedCUDA:
+      return DispatchKey::QuantizedCUDA;
+    case Backend::QuantizedPrivateUse1:
+      return DispatchKey::QuantizedPrivateUse1;
+    case Backend::Undefined:
+      return DispatchKey::Undefined;
+    case Backend::MPS:
+      return DispatchKey::MPS;
+    case Backend::HPU:
+      return DispatchKey::HPU;
+    case Backend::MTIA:
+      return DispatchKey::MTIA;
+    case Backend::PrivateUse1:
+      return DispatchKey::PrivateUse1;
+    default:
+      throw std::runtime_error("Unknown backend");
+  }
+}
+
+inline DeviceType backendToDeviceType(Backend b) {
+  switch (b) {
+    case Backend::CPU:
+    case Backend::MkldnnCPU:
+    case Backend::SparseCPU:
+    case Backend::SparseCsrCPU:
+    case Backend::QuantizedCPU:
+      return DeviceType::CPU;
+    case Backend::CUDA:
+    case Backend::SparseCUDA:
+    case Backend::QuantizedCUDA:
+    case Backend::SparseCsrCUDA:
+      return DeviceType::CUDA;
+    case Backend::HIP:
+      return DeviceType::HIP;
+    case Backend::VE:
+      return DeviceType::VE;
+    case Backend::FPGA:
+      return DeviceType::FPGA;
+    case Backend::MAIA:
+      return DeviceType::MAIA;
+    case Backend::XLA:
+      return DeviceType::XLA;
+    case Backend::Lazy:
+      return DeviceType::Lazy;
+    case Backend::SparseHIP:
+      return DeviceType::HIP;
+    case Backend::SparseVE:
+      return DeviceType::VE;
+    case Backend::SparseCsrHIP:
+      return DeviceType::HIP;
+    case Backend::SparseCsrVE:
+      return DeviceType::VE;
+    case Backend::IPU:
+      return DeviceType::IPU;
+    case Backend::XPU:
+    case Backend::SparseXPU:
+    case Backend::SparseCsrXPU:
+    case Backend::QuantizedXPU:
+      return DeviceType::XPU;
+    case Backend::Vulkan:
+      return DeviceType::Vulkan;
+    case Backend::Metal:
+      return DeviceType::Metal;
+    case Backend::Meta:
+      return DeviceType::Meta;
+    case Backend::MPS:
+      return DeviceType::MPS;
+    case Backend::HPU:
+      return DeviceType::HPU;
+    case Backend::MTIA:
+      return DeviceType::MTIA;
+    case Backend::PrivateUse1:
+    case Backend::SparsePrivateUse1:
+    case Backend::SparseCsrPrivateUse1:
+    case Backend::QuantizedPrivateUse1:
+      return DeviceType::PrivateUse1;
+    case Backend::Undefined:
+      TORCH_CHECK(false, "Undefined backend is not a valid device type");
+    default:
+      TORCH_CHECK(false, "Unknown backend");
+  }
+}
+
+inline const char* toString(Backend b) {
+  switch (b) {
+    case Backend::CPU:
+      return "CPU";
+    case Backend::CUDA:
+      return "CUDA";
+    case Backend::HIP:
+      return "HIP";
+    case Backend::VE:
+      return "VE";
+    case Backend::FPGA:
+      return "FPGA";
+    case Backend::XPU:
+      return "XPU";
+    case Backend::IPU:
+      return "IPU";
+    case Backend::MAIA:
+      return "MAIA";
+    case Backend::XLA:
+      return "XLA";
+    case Backend::Lazy:
+      return "Lazy";
+    case Backend::MPS:
+      return "MPS";
+    case Backend::SparseCPU:
+      return "SparseCPU";
+    case Backend::SparseCUDA:
+      return "SparseCUDA";
+    case Backend::SparseHIP:
+      return "SparseHIP";
+    case Backend::SparseVE:
+      return "SparseVE";
+    case Backend::SparseXPU:
+      return "SparseXPU";
+    case Backend::SparsePrivateUse1:
+      return "SparsePrivateUse1";
+    case Backend::SparseCsrCPU:
+      return "SparseCsrCPU";
+    case Backend::SparseCsrCUDA:
+      return "SparseCsrCUDA";
+    case Backend::SparseCsrHIP:
+      return "SparseCsrHIP";
+    case Backend::SparseCsrVE:
+      return "SparseCsrVE";
+    case Backend::SparseCsrXPU:
+      return "SparseCsrXPU";
+    case Backend::SparseCsrPrivateUse1:
+      return "SparseCsrPrivateUse1";
+    case Backend::MkldnnCPU:
+      return "MkldnnCPU";
+    case Backend::Vulkan:
+      return "Vulkan";
+    case Backend::Metal:
+      return "Metal";
+    case Backend::Meta:
+      return "Meta";
+    case Backend::QuantizedCPU:
+      return "QuantizedCPU";
+    case Backend::QuantizedCUDA:
+      return "QuantizedCUDA";
+    case Backend::QuantizedXPU:
+      return "QuantizedXPU";
+    case Backend::QuantizedPrivateUse1:
+      return "QuantizedPrivateUse1";
+    case Backend::HPU:
+      return "HPU";
+    case Backend::MTIA:
+      return "MTIA";
+    case Backend::PrivateUse1:
+      return "PrivateUseOne";
+    default:
+      return "UNKNOWN_BACKEND";
+  }
+}
+
+inline bool isSparse(Backend b) {
+  switch (b) {
+    case Backend::SparseXPU:
+    case Backend::SparseCPU:
+    case Backend::SparseCUDA:
+    case Backend::SparseHIP:
+    case Backend::SparseVE:
+    case Backend::SparsePrivateUse1:
+      return true;
+    default:
+      return false;
+  }
+}
+
+inline bool isSparseCsr(Backend b) {
+  switch (b) {
+    case Backend::SparseCsrXPU:
+    case Backend::SparseCsrCPU:
+    case Backend::SparseCsrCUDA:
+    case Backend::SparseCsrHIP:
+    case Backend::SparseCsrVE:
+    case Backend::SparseCsrPrivateUse1:
+      return true;
+    default:
+      return false;
+  }
+}
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/CachingDeviceAllocator.h

@@ -0,0 +1,131 @@
+#pragma once
+
+#include <c10/core/Allocator.h>
+#include <c10/util/irange.h>
+
+#include <array>
+
+namespace c10::CachingDeviceAllocator {
+
+struct Stat {
+  void increase(size_t amount) {
+    current += static_cast<int64_t>(amount);
+    peak = std::max(current, peak);
+    allocated += static_cast<int64_t>(amount);
+  }
+
+  void decrease(size_t amount) {
+    current -= static_cast<int64_t>(amount);
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
+        current >= 0,
+        "Negative tracked stat in device allocator (likely logic error).");
+    freed += static_cast<int64_t>(amount);
+  }
+
+  void reset_accumulated() {
+    allocated = 0;
+    freed = 0;
+  }
+
+  void reset_peak() {
+    peak = current;
+  }
+
+  int64_t current = 0;
+  int64_t peak = 0;
+  int64_t allocated = 0;
+  int64_t freed = 0;
+};
+
+enum struct StatType : uint64_t {
+  AGGREGATE = 0,
+  SMALL_POOL = 1,
+  LARGE_POOL = 2,
+  NUM_TYPES = 3 // remember to update this whenever a new stat type is added
+};
+
+using StatArray = std::array<Stat, static_cast<size_t>(StatType::NUM_TYPES)>;
+using StatTypes = std::array<bool, static_cast<size_t>(StatType::NUM_TYPES)>;
+
+template <typename Func>
+void for_each_selected_stat_type(const StatTypes& stat_types, Func f) {
+  for (const auto stat_type : c10::irange(stat_types.size())) {
+    if (stat_types[stat_type]) {
+      f(stat_type);
+    }
+  }
+}
+
+// Struct containing memory allocator summary statistics for a device.
+struct DeviceStats {
+  // COUNT: allocations requested by client code
+  StatArray allocation;
+  // COUNT: number of allocated segments from device memory allocation.
+  StatArray segment;
+  // COUNT: number of active memory blocks (allocated or used by stream)
+  StatArray active;
+  // COUNT: number of inactive, split memory blocks (unallocated but can't be
+  // released via device memory deallocation)
+  StatArray inactive_split;
+
+  // SUM: bytes allocated by this memory alocator
+  StatArray allocated_bytes;
+  // SUM: bytes reserved by this memory allocator (both free and used)
+  StatArray reserved_bytes;
+  // SUM: bytes within active memory blocks
+  StatArray active_bytes;
+  // SUM: bytes within inactive, split memory blocks
+  StatArray inactive_split_bytes;
+  // SUM: bytes requested by client code
+  StatArray requested_bytes;
+
+  // COUNT: total number of failed calls to device malloc necessitating cache
+  // flushes.
+  int64_t num_alloc_retries = 0;
+
+  // COUNT: total number of OOMs (i.e. failed calls to device memory allocation
+  // after cache flush)
+  int64_t num_ooms = 0;
+
+  // COUNT: total number of oversize blocks allocated from pool
+  Stat oversize_allocations;
+
+  // COUNT: total number of oversize blocks requiring malloc
+  Stat oversize_segments;
+
+  // COUNT: total number of synchronize_and_free_events() calls
+  int64_t num_sync_all_streams = 0;
+
+  // COUNT: total number of device memory allocation calls. This includes both
+  // mapped and malloced memory.
+  int64_t num_device_alloc = 0;
+
+  // COUNT: total number of device memory deallocation calls. This includes both
+  // un-mapped and free memory.
+  int64_t num_device_free = 0;
+
+  // SIZE: maximum block size that is allowed to be split.
+  int64_t max_split_size = 0;
+};
+
+// Size pretty-printer
+inline std::string format_size(uint64_t size) {
+  std::ostringstream os;
+  os.precision(2);
+  os << std::fixed;
+  if (size <= 1024) {
+    os << size << " bytes";
+  } else if (size <= 1048576) {
+    os << (static_cast<double>(size) / 1024.0);
+    os << " KiB";
+  } else if (size <= 1073741824ULL) {
+    os << static_cast<double>(size) / 1048576.0;
+    os << " MiB";
+  } else {
+    os << static_cast<double>(size) / 1073741824.0;
+    os << " GiB";
+  }
+  return os.str();
+}
+
+} // namespace c10::CachingDeviceAllocator

videochat2/lib/python3.10/site-packages/torch/include/c10/core/CompileTimeFunctionPointer.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <c10/util/TypeTraits.h>
+#include <type_traits>
+
+namespace c10 {
+
+/**
+ * Represent a function pointer as a C++ type.
+ * This allows using the function pointer as a type
+ * in a template and calling it from inside the template
+ * allows the compiler to inline the call because it
+ * knows the function pointer at compile time.
+ *
+ * Example 1:
+ *  int add(int a, int b) {return a + b;}
+ *  using Add = TORCH_FN_TYPE(add);
+ *  template<class Func> struct Executor {
+ *    int execute(int a, int b) {
+ *      return Func::func_ptr()(a, b);
+ *    }
+ *  };
+ *  Executor<Add> executor;
+ *  EXPECT_EQ(3, executor.execute(1, 2));
+ *
+ * Example 2:
+ *  int add(int a, int b) {return a + b;}
+ *  template<class Func> int execute(Func, int a, int b) {
+ *    return Func::func_ptr()(a, b);
+ *  }
+ *  EXPECT_EQ(3, execute(TORCH_FN(add), 1, 2));
+ */
+template <class FuncType_, FuncType_* func_ptr_>
+struct CompileTimeFunctionPointer final {
+  static_assert(
+      guts::is_function_type<FuncType_>::value,
+      "TORCH_FN can only wrap function types.");
+  using FuncType = FuncType_;
+
+  static constexpr FuncType* func_ptr() {
+    return func_ptr_;
+  }
+};
+
+template <class T>
+struct is_compile_time_function_pointer : std::false_type {};
+template <class FuncType, FuncType* func_ptr>
+struct is_compile_time_function_pointer<
+    CompileTimeFunctionPointer<FuncType, func_ptr>> : std::true_type {};
+
+} // namespace c10
+
+#define TORCH_FN_TYPE(func)                                           \
+  ::c10::CompileTimeFunctionPointer<                                  \
+      std::remove_pointer_t<std::remove_reference_t<decltype(func)>>, \
+      func>
+#define TORCH_FN(func) TORCH_FN_TYPE(func)()

videochat2/lib/python3.10/site-packages/torch/include/c10/core/ConstantSymNodeImpl.h

@@ -0,0 +1,110 @@
+#pragma once
+
+#include <c10/core/SymNodeImpl.h>
+#include <c10/macros/Export.h>
+#include <c10/util/Exception.h>
+#include <cstdint>
+#include <optional>
+#include <string>
+#include <variant>
+
+namespace c10 {
+
+// Unlike other SymNodeImpl, this cannot be "dispatched" conventionally,
+// as it typically needs to defer to another SymNodeImpl
+//
+// Can either represent a bool, int (don't support float yet) this is useful
+// for representing otherwise unrepresentable large negative integer constant.
+template <typename T>
+class C10_API ConstantSymNodeImpl : public SymNodeImpl {
+  static_assert(
+      ::std::is_same_v<T, int64_t> || ::std::is_same_v<T, bool>,
+      "ConstantSymNodeImpl can only accept int64_t or bool types");
+
+ public:
+  ConstantSymNodeImpl(T val) : value_(val) {}
+
+  bool is_int() override {
+    return is_int_();
+  }
+  bool is_bool() override {
+    return is_bool_();
+  }
+  bool is_float() override {
+    return false;
+  }
+  int64_t guard_int(
+      const char* file [[maybe_unused]],
+      int64_t line [[maybe_unused]]) override {
+    TORCH_CHECK(is_int(), "not an int");
+    return int_();
+  }
+  bool guard_bool(
+      const char* file [[maybe_unused]],
+      int64_t line [[maybe_unused]]) override {
+    TORCH_CHECK(is_bool(), "not a bool");
+    return bool_();
+  }
+  double guard_float(
+      const char* file [[maybe_unused]],
+      int64_t line [[maybe_unused]]) override {
+    TORCH_CHECK(false, "not a float");
+  }
+  int64_t int_() override {
+    TORCH_CHECK(is_int(), "not an int");
+    return ::std::get<int64_t>(value_);
+  }
+  bool bool_() override {
+    TORCH_CHECK(is_bool(), "not a bool");
+    return ::std::get<bool>(value_);
+  }
+  bool has_hint() override {
+    return true;
+  }
+  c10::SymNode eq(const c10::SymNode& other) override;
+  c10::SymNode ne(const c10::SymNode& other) override;
+  c10::SymNode ge(const c10::SymNode& other) override;
+  c10::SymNode le(const c10::SymNode& other) override;
+  c10::SymNode lt(const c10::SymNode& other) override;
+  c10::SymNode gt(const c10::SymNode& other) override;
+  c10::SymNode mul(const c10::SymNode& other) override;
+  ::std::string str() override {
+    if constexpr (is_int_()) {
+      return ::std::to_string(::std::get<int64_t>(value_));
+    } else {
+      return ::std::get<bool>(value_) ? "true" : "false";
+    }
+  }
+  std::optional<int64_t> constant_int() override {
+    if constexpr (is_int_()) {
+      return ::std::get<int64_t>(value_);
+    } else {
+      return std::nullopt;
+    }
+  }
+  std::optional<bool> constant_bool() override {
+    if constexpr (is_bool_()) {
+      return ::std::get<bool>(value_);
+    } else {
+      return std::nullopt;
+    }
+  }
+  bool is_constant() override {
+    return true;
+  }
+  bool is_symbolic() override {
+    return false;
+  }
+
+ private:
+  ::std::variant<int64_t, bool> value_;
+
+  static constexpr bool is_int_() {
+    return ::std::is_same_v<T, int64_t>;
+  }
+  static constexpr bool is_bool_() {
+    return ::std::is_same_v<T, bool>;
+  }
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/DefaultDtype.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <c10/core/ScalarType.h>
+#include <c10/macros/Export.h>
+
+namespace caffe2 {
+class TypeMeta;
+} // namespace caffe2
+
+namespace c10 {
+C10_API void set_default_dtype(caffe2::TypeMeta dtype);
+C10_API const caffe2::TypeMeta get_default_dtype();
+C10_API ScalarType get_default_dtype_as_scalartype();
+C10_API const caffe2::TypeMeta get_default_complex_dtype();
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/DefaultTensorOptions.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/core/Layout.h>
+#include <c10/core/ScalarType.h>
+#include <c10/util/typeid.h>
+
+namespace c10 {
+
+struct TensorOptions;
+
+/// Like TensorOptions, but all fields are guaranteed to be filled.
+struct DefaultTensorOptions {
+  DefaultTensorOptions() = default;
+
+  caffe2::TypeMeta dtype() const noexcept {
+    return dtype_;
+  }
+  Device device() const noexcept {
+    return device_;
+  }
+  Layout layout() const noexcept {
+    return layout_;
+  }
+  bool requires_grad() const noexcept {
+    return requires_grad_;
+  }
+
+  // Defined in TensorOptions.h
+  inline DefaultTensorOptions& merge(const TensorOptions& options);
+
+ private:
+  caffe2::TypeMeta dtype_ = caffe2::TypeMeta::Make<float>(); // 64-bit
+  Device device_ = at::kCPU; // 32-bit
+  Layout layout_ = at::kStrided; // 8-bit
+  bool requires_grad_ = false; // 8-bit
+};
+
+inline const DefaultTensorOptions& getDefaultTensorOptions() {
+  static const auto options = DefaultTensorOptions();
+  return options;
+}
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/Device.h

@@ -0,0 +1,216 @@
+#pragma once
+
+#include <c10/core/DeviceType.h>
+#include <c10/macros/Export.h>
+#include <c10/util/Exception.h>
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <iosfwd>
+#include <string>
+
+namespace c10 {
+
+/// An index representing a specific device; e.g., the 1 in GPU 1.
+/// A DeviceIndex is not independently meaningful without knowing
+/// the DeviceType it is associated; try to use Device rather than
+/// DeviceIndex directly.
+using DeviceIndex = int8_t;
+
+/// Represents a compute device on which a tensor is located. A device is
+/// uniquely identified by a type, which specifies the type of machine it is
+/// (e.g. CPU or CUDA GPU), and a device index or ordinal, which identifies the
+/// specific compute device when there is more than one of a certain type. The
+/// device index is optional, and in its defaulted state represents (abstractly)
+/// "the current device". Further, there are two constraints on the value of the
+/// device index, if one is explicitly stored:
+/// 1. A negative index represents the current device, a non-negative index
+/// represents a specific, concrete device,
+/// 2. When the device type is CPU, the device index must be zero.
+struct C10_API Device final {
+  using Type = DeviceType;
+
+  /// Constructs a new `Device` from a `DeviceType` and an optional device
+  /// index.
+  /* implicit */ Device(DeviceType type, DeviceIndex index = -1)
+      : type_(type), index_(index) {
+    validate();
+  }
+
+  /// Constructs a `Device` from a string description, for convenience.
+  /// The string supplied must follow the following schema:
+  /// `(cpu|cuda)[:<device-index>]`
+  /// where `cpu` or `cuda` specifies the device type, and
+  /// `:<device-index>` optionally specifies a device index.
+  /* implicit */ Device(const std::string& device_string);
+
+  /// Returns true if the type and index of this `Device` matches that of
+  /// `other`.
+  bool operator==(const Device& other) const noexcept {
+    return this->type_ == other.type_ && this->index_ == other.index_;
+  }
+
+  /// Returns true if the type or index of this `Device` differs from that of
+  /// `other`.
+  bool operator!=(const Device& other) const noexcept {
+    return !(*this == other);
+  }
+
+  /// Sets the device index.
+  void set_index(DeviceIndex index) {
+    index_ = index;
+  }
+
+  /// Returns the type of device this is.
+  DeviceType type() const noexcept {
+    return type_;
+  }
+
+  /// Returns the optional index.
+  DeviceIndex index() const noexcept {
+    return index_;
+  }
+
+  /// Returns true if the device has a non-default index.
+  bool has_index() const noexcept {
+    return index_ != -1;
+  }
+
+  /// Return true if the device is of CUDA type.
+  bool is_cuda() const noexcept {
+    return type_ == DeviceType::CUDA;
+  }
+
+  /// Return true if the device is of PrivateUse1 type.
+  bool is_privateuseone() const noexcept {
+    return type_ == DeviceType::PrivateUse1;
+  }
+
+  /// Return true if the device is of MPS type.
+  bool is_mps() const noexcept {
+    return type_ == DeviceType::MPS;
+  }
+
+  /// Return true if the device is of HIP type.
+  bool is_hip() const noexcept {
+    return type_ == DeviceType::HIP;
+  }
+
+  /// Return true if the device is of VE type.
+  bool is_ve() const noexcept {
+    return type_ == DeviceType::VE;
+  }
+
+  /// Return true if the device is of XPU type.
+  bool is_xpu() const noexcept {
+    return type_ == DeviceType::XPU;
+  }
+
+  /// Return true if the device is of IPU type.
+  bool is_ipu() const noexcept {
+    return type_ == DeviceType::IPU;
+  }
+
+  /// Return true if the device is of XLA type.
+  bool is_xla() const noexcept {
+    return type_ == DeviceType::XLA;
+  }
+
+  /// Return true if the device is of MTIA type.
+  bool is_mtia() const noexcept {
+    return type_ == DeviceType::MTIA;
+  }
+
+  /// Return true if the device is of HPU type.
+  bool is_hpu() const noexcept {
+    return type_ == DeviceType::HPU;
+  }
+
+  /// Return true if the device is of Lazy type.
+  bool is_lazy() const noexcept {
+    return type_ == DeviceType::Lazy;
+  }
+
+  /// Return true if the device is of Vulkan type.
+  bool is_vulkan() const noexcept {
+    return type_ == DeviceType::Vulkan;
+  }
+
+  /// Return true if the device is of Metal type.
+  bool is_metal() const noexcept {
+    return type_ == DeviceType::Metal;
+  }
+
+  /// Return true if the device is of MAIA type.
+  bool is_maia() const noexcept {
+    return type_ == DeviceType::MAIA;
+  }
+
+  /// Return true if the device is of META type.
+  bool is_meta() const noexcept {
+    return type_ == DeviceType::Meta;
+  }
+
+  /// Return true if the device is of CPU type.
+  bool is_cpu() const noexcept {
+    return type_ == DeviceType::CPU;
+  }
+
+  /// Return true if the device supports arbitrary strides.
+  bool supports_as_strided() const noexcept {
+    return type_ != DeviceType::IPU && type_ != DeviceType::XLA &&
+        type_ != DeviceType::Lazy && type_ != DeviceType::MTIA;
+  }
+
+  /// Same string as returned from operator<<.
+  std::string str() const;
+
+ private:
+  DeviceType type_;
+  DeviceIndex index_ = -1;
+  void validate() {
+    // Removing these checks in release builds noticeably improves
+    // performance in micro-benchmarks.
+    // This is safe to do, because backends that use the DeviceIndex
+    // have a later check when we actually try to switch to that device.
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
+        index_ >= -1,
+        "Device index must be -1 or non-negative, got ",
+        static_cast<int>(index_));
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
+        !is_cpu() || index_ <= 0,
+        "CPU device index must be -1 or zero, got ",
+        static_cast<int>(index_));
+  }
+};
+
+C10_API std::ostream& operator<<(std::ostream& stream, const Device& device);
+
+} // namespace c10
+
+namespace std {
+template <>
+struct hash<c10::Device> {
+  size_t operator()(c10::Device d) const noexcept {
+    // Are you here because this static assert failed?  Make sure you ensure
+    // that the bitmasking code below is updated accordingly!
+    static_assert(sizeof(c10::DeviceType) == 1, "DeviceType is not 8-bit");
+    static_assert(sizeof(c10::DeviceIndex) == 1, "DeviceIndex is not 8-bit");
+    // Note [Hazard when concatenating signed integers]
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    // We must first convert to a same-sized unsigned type, before promoting to
+    // the result type, to prevent sign extension when any of the values is -1.
+    // If sign extension occurs, you'll clobber all of the values in the MSB
+    // half of the resulting integer.
+    //
+    // Technically, by C/C++ integer promotion rules, we only need one of the
+    // uint32_t casts to the result type, but we put in both for explicitness's
+    // sake.
+    uint32_t bits = static_cast<uint32_t>(static_cast<uint8_t>(d.type()))
+            << 16 |
+        static_cast<uint32_t>(static_cast<uint8_t>(d.index()));
+    return std::hash<uint32_t>{}(bits);
+  }
+};
+} // namespace std

videochat2/lib/python3.10/site-packages/torch/include/c10/core/DeviceArray.h

@@ -0,0 +1,28 @@
+#include <c10/core/Allocator.h>
+#include <c10/util/Exception.h>
+#include <cstddef>
+#include <cstdint>
+#include <type_traits>
+
+namespace c10 {
+
+template <typename T>
+class DeviceArray {
+ public:
+  DeviceArray(c10::Allocator& allocator, size_t size)
+      : data_ptr_(allocator.allocate(size * sizeof(T))) {
+    static_assert(std::is_trivial<T>::value, "T must be a trivial type");
+    TORCH_INTERNAL_ASSERT(
+        0 == (reinterpret_cast<intptr_t>(data_ptr_.get()) % alignof(T)),
+        "c10::DeviceArray: Allocated memory is not aligned for this data type");
+  }
+
+  T* get() {
+    return static_cast<T*>(data_ptr_.get());
+  }
+
+ private:
+  c10::DataPtr data_ptr_;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/DeviceGuard.h

@@ -0,0 +1,199 @@
+#pragma once
+
+#include <c10/core/Device.h>
+#include <c10/core/impl/DeviceGuardImplInterface.h>
+#include <c10/core/impl/InlineDeviceGuard.h>
+#include <c10/core/impl/VirtualGuardImpl.h>
+#include <c10/util/Optional.h>
+
+namespace c10 {
+
+/// RAII guard that sets a certain default device in its constructor, and
+/// changes it back to the device that was originally active upon destruction.
+///
+/// The device is always reset to the one that was active at the time of
+/// construction of the guard. Even if you `set_device` after construction, the
+/// destructor will still reset the device to the one that was active at
+/// construction time.
+///
+/// This device guard does NOT have an uninitialized state; it is guaranteed
+/// to reset a device on exit.  If you are in a situation where you *might*
+/// want to setup a guard (i.e., are looking for the moral equivalent
+/// of std::optional<DeviceGuard>), see OptionalDeviceGuard.
+class DeviceGuard {
+ public:
+  /// No default constructor; see Note [Omitted default constructor from RAII]
+  explicit DeviceGuard() = delete;
+
+  /// Set the current device to the passed Device.
+  explicit DeviceGuard(Device device) : guard_(device) {}
+
+  /// This constructor is for testing only.
+  explicit DeviceGuard(
+      Device device,
+      const impl::DeviceGuardImplInterface* impl)
+      : guard_(device, impl) {}
+
+  /// Copy is disallowed
+  DeviceGuard(const DeviceGuard&) = delete;
+  DeviceGuard& operator=(const DeviceGuard&) = delete;
+
+  /// Move is disallowed, as DeviceGuard does not have an uninitialized state,
+  /// which is required for moves on types with nontrivial destructors.
+  DeviceGuard(DeviceGuard&& other) = delete;
+  DeviceGuard& operator=(DeviceGuard&& other) = delete;
+
+  /// Sets the device to the given one.  The specified device must be consistent
+  /// with the device type originally specified during guard construction.
+  ///
+  /// TODO: The consistency check here is inconsistent with StreamGuard's
+  /// behavior with set_stream, where a stream on a different device than
+  /// the original one isn't an error; we just reset the stream and then
+  /// switch devices.
+  void reset_device(at::Device device) {
+    guard_.reset_device(device);
+  }
+
+  /// This method is for testing only.
+  void reset_device(
+      at::Device device,
+      const impl::DeviceGuardImplInterface* impl) {
+    guard_.reset_device(device, impl);
+  }
+
+  /// Sets the device index to the given one.  The device type is inferred
+  /// from the original device type the guard was constructed with.
+  void set_index(DeviceIndex index) {
+    guard_.set_index(index);
+  }
+
+  /// Returns the device that was set at the time the guard was constructed.
+  Device original_device() const {
+    return guard_.original_device();
+  }
+
+  /// Returns the most recent device that was set using this device guard,
+  /// either from construction, or via set_device.
+  Device current_device() const {
+    return guard_.current_device();
+  }
+
+ private:
+  impl::InlineDeviceGuard<impl::VirtualGuardImpl> guard_;
+};
+
+/**
+ * A OptionalDeviceGuard is an RAII class that sets a device to some value on
+ * initialization, and resets the device to its original value on destruction.
+ * Morally, a OptionalDeviceGuard is equivalent to std::optional<DeviceGuard>,
+ * but with extra constructors and methods as appropriate.
+ *
+ * Besides its obvious use (optionally applying a DeviceGuard),
+ * OptionalDeviceGuard is often also used for the following idiom:
+ *
+ *    OptionalDeviceGuard g;
+ *    for (const auto& t : tensors) {
+ *      g.set_device(t.device());
+ *      do_something_with(t);
+ *    }
+ *
+ * This usage is marginally more efficient than constructing a DeviceGuard every
+ * iteration of the for loop, as it avoids an unnecessary device reset.
+ *
+ * Unlike DeviceGuard, a OptionalDeviceGuard may be uninitialized.  This occurs
+ * when you use the nullary constructor, or pass a nullopt to the constructor.
+ * Uninitialized OptionalDeviceGuards do *nothing*; they do not know what the
+ * original device was and they do not reset on destruction.  This is why
+ * original_device() and current_device() return std::optional<Device> rather
+ * than Device (as they do in DeviceGuard), and also is why we didn't just
+ * provide OptionalDeviceGuard by default and hide DeviceGuard from users.
+ *
+ * The semantics of an OptionalDeviceGuard are exactly explained by thinking
+ * of it as an std::optional<DeviceGuard>.  In particular, an initialized
+ * OptionalDeviceGuard doesn't restore device to its value at construction; it
+ * restores device to its value *at initialization*.  So if you have the
+ * program:
+ *
+ *     setDevice(1);
+ *     OptionalDeviceGuard g;
+ *     setDevice(2);
+ *     g.reset_device(Device(DeviceType::CUDA, 3));  // initializes!
+ *
+ * On destruction, g will reset device to 2, rather than 1.
+ *
+ * An uninitialized OptionalDeviceGuard is distinct from a (initialized)
+ * DeviceGuard whose original_device_ and current_device_ match, since the
+ * DeviceGuard will still reset the device to original_device_.
+ */
+class OptionalDeviceGuard {
+ public:
+  /// Create an uninitialized guard.  Set the guard later using reset_device.
+  explicit OptionalDeviceGuard() = default;
+
+  /// Initialize the guard, setting the current device to the passed Device.
+  explicit OptionalDeviceGuard(Device device) : guard_(device) {}
+
+  /// Initialize the guard if a Device is passed; otherwise leave the
+  /// guard uninitialized.
+  explicit OptionalDeviceGuard(std::optional<Device> device) : guard_(device) {}
+
+  /// Constructor for testing only.
+  explicit OptionalDeviceGuard(
+      Device device,
+      const impl::DeviceGuardImplInterface* impl)
+      : guard_(device, impl) {}
+
+  /// Copy is disallowed
+  OptionalDeviceGuard(const OptionalDeviceGuard&) = delete;
+  OptionalDeviceGuard& operator=(const OptionalDeviceGuard&) = delete;
+
+  /// Move is disallowed
+  /// See Note [Explicit initialization of optional fields]
+  /// and // Note [Move construction for RAII guards is tricky]
+  /// for rationale.
+  OptionalDeviceGuard(OptionalDeviceGuard&& other) = delete;
+  OptionalDeviceGuard& operator=(OptionalDeviceGuard&& other) = delete;
+
+  /// Sets the device to the given one.  The specified device must be consistent
+  /// with the device type originally specified during guard construction.
+  void reset_device(at::Device device) {
+    guard_.reset_device(device);
+  }
+
+  /// For testing only
+  void reset_device(
+      at::Device device,
+      const impl::DeviceGuardImplInterface* impl) {
+    guard_.reset_device(device, impl);
+  }
+
+  /// Returns the device that was set at the time the guard was constructed.
+  std::optional<Device> original_device() const {
+    return guard_.original_device();
+  }
+
+  /// Returns the most recent device that was set using this device guard,
+  /// either from construction, or via reset_device.
+  std::optional<Device> current_device() const {
+    return guard_.current_device();
+  }
+
+ private:
+  impl::InlineOptionalDeviceGuard<impl::VirtualGuardImpl> guard_{};
+};
+
+// Note [Whither the DeviceGuard boilerplate]
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Design note: in principle, we could avoid these wrappers using:
+//
+// using DeviceGuard = impl::InlineDeviceGuard<impl::VirtualGuardImpl>;
+// using OptionalDeviceGuard =
+// impl::InlineOptionalDeviceGuard<impl::VirtualGuardImpl>;
+//
+// But the error messages are worse, and our users can't just look at the
+// header file to find out what's going on.  Furthermore, for specializations
+// like CUDAStreamGuard, it can be profitable to replace some interfaces with
+// refined types (e.g., return CUDAStream instead of Stream).  So, we eat
+// the boilerplate and write out the API explicitly.
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/DispatchKey.h

@@ -0,0 +1,747 @@
+#pragma once
+
+#include <c10/core/DeviceType.h>
+#include <c10/macros/Export.h>
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <ostream>
+#include <string>
+
+namespace c10 {
+
+// Semantically, each value of BackendComponent identifies a "backend" for our
+// dispatch. Some functionalities that we may dispatch to are allowed to
+// register different handlers for each backend. The BackendComponent is then
+// used to figure out which backend implementation to dispatch to.
+
+// In implementation terms, the backend component identifies a specific "bit" in
+// a DispatchKeySet. The bits in the DispatchKeySet are split between the bottom
+// ~12 "BackendComponent" bits, while the remaining upper bits are assigned to
+// functionalities. When we encounter a functionality bit that is known to be
+// customizable per-backend, then we also look at the lower BackendComponent
+// bits and take the highest bit to determine which backend's implementation to
+// use.
+
+// WARNING!  If you add a new backend component to the end of this list,
+// make sure you register it before Meta.
+// Meta must be at the end so that meta key in tls triggers meta kernels.
+// (But you shouldn't: private use keys should have higher precedence than all
+// built-in keys)
+
+// If you add a new (non-privateuse) backend here,
+// make sure to add an Autograd<Backend> fallthrough kernel
+// in aten/src/ATen/core/VariableFallbackKernel.cpp
+
+#define C10_FORALL_BACKEND_COMPONENTS(_, extra) \
+  _(CPU, extra)                                 \
+  _(CUDA, extra)                                \
+  _(HIP, extra)                                 \
+  _(XLA, extra)                                 \
+  _(MPS, extra)                                 \
+  _(IPU, extra)                                 \
+  _(XPU, extra)                                 \
+  _(HPU, extra)                                 \
+  _(VE, extra)                                  \
+  _(Lazy, extra)                                \
+  _(MTIA, extra)                                \
+  _(PrivateUse1, extra)                         \
+  _(PrivateUse2, extra)                         \
+  _(PrivateUse3, extra)                         \
+  _(Meta, extra)
+
+// WARNING!  If we add a new per-backend functionality key that has higher
+// priority than Autograd, then make sure you update EndOfRuntimeBackendKeys
+
+#define C10_FORALL_FUNCTIONALITY_KEYS(_) \
+  _(Dense, )                             \
+  _(Quantized, Quantized)                \
+  _(Sparse, Sparse)                      \
+  _(SparseCsr, SparseCsr)                \
+  _(NestedTensor, NestedTensor)          \
+  _(AutogradFunctionality, Autograd)
+
+enum class BackendComponent : uint8_t {
+
+  // A "backend" is colloquially used to refer to handlers for dispatch
+  // which actually implement the numerics of an operation in question.
+  //
+  // Due to the nature of the enum, these backends are specified in
+  // an ordered way, but for most backends this order is not semantically
+  // meaningful (e.g., it's valid to reorder these backends without changing
+  // semantics).  The only situation when backend ordering is meaningful
+  // is when the backend participates in multiple dispatch with another
+  // backend; e.g., CPU and CUDA (cuda must have higher priority).
+
+  // These keys don't correspond to individual kernels.
+  // Instead, they represent the backends that are allowed to override specific
+  // pieces of functionality:
+  // - dense kernels (e.g. DispatchKey::CPU)
+  // - sparse kernels (e.g. DispatchKey::SparseCPU)
+  // - quantized kernels (e.g. DispatchKey::QuantizedCPU)
+  // - autograd kernels (e.g. DispatchKey::AutogradCPU)
+  // We reserve space in the runtime operator table for this full cross product
+  // of
+  // [backends in this enum] x [keys below that are explicitly marked as having
+  // per-backend functionality]
+  //
+  // A meta tensor is a tensor without any data associated with it.  (They
+  // have also colloquially been referred to as tensors on the "null" device).
+  // A meta tensor can be used to dry run operators without actually doing any
+  // computation, e.g., add on two meta tensors would give you another meta
+  // tensor with the output shape and dtype, but wouldn't actually add anything.
+
+  InvalidBit = 0,
+#define DEFINE_BACKEND_COMPONENT(n, _) n##Bit,
+  C10_FORALL_BACKEND_COMPONENTS(DEFINE_BACKEND_COMPONENT, unused)
+#undef DEFINE_BACKEND_COMPONENT
+
+  // Define an alias to represent end of backend dispatch keys.
+  // If you add new backend keys after PrivateUse3, please also update it here.
+  EndOfBackendKeys = MetaBit,
+};
+
+// Semantically, a dispatch key identifies a possible "level" in our
+// dispatch, for which a handler may be registered. Each handler corresponds
+// to a type of functionality.
+//
+// In implementation terms, the dispatch key identifies a specific "bit" in a
+// DispatchKeySet.  Higher bit indexes get handled by dispatching first (because
+// we "count leading zeros" when we extract the highest priority dispatch
+// key.)
+//
+// Note [DispatchKey Classification]
+// This enum actually contains several types of keys, which are explained
+// in more detail further down:
+// (1) non-customizable backends (e.g. FPGA)
+// (2) non-customizable functionalities (e.g. Functionalize)
+// (3) functionalized that are customizable per backend (e.g. Dense, Sparse,
+// AutogradFunctionality) (4) per-backend instances of customizable
+// functionalities (e.g. CPU, SparseCPU, AutogradCPU) (5) alias keys (e.g.
+// CompositeImplicitAutograd)
+//
+// Of the categories above, it's important to note:
+// (a) which keys are assigned individual bits in a DispatchKeySet
+// (b) which keys are assigned individual slots in the runtime operator table
+// ("Runtime keys")
+//
+// (1), (2) and (3) all get their own dedicated bits in the DispatchKeySet.
+// (1), (2) and (4) all get their own dedicated slots in the runtime operator
+// table.
+
+// See Note [DispatchKeySet Internal Representation] for more details.
+//
+// NOTE: Keep the list in sync with `DispatchKey` in torchgen/model.py
+enum class DispatchKey : uint16_t {
+
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~~ UNDEFINED ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
+  // This is not a "real" functionality, but it exists to give us a "nullopt"
+  // element we can return for cases when a DispatchKeySet contains no elements.
+  // You can think a more semantically accurate definition of DispatchKey is:
+  //
+  //    using DispatchKey = std::optional<RealDispatchKey>
+  //
+  // and Undefined == nullopt.  We didn't actually represent
+  // it this way because std::optional<RealDispatchKey> would take two
+  // words, when DispatchKey fits in eight bits.
+
+  Undefined = 0,
+
+  // Define an alias for Undefined to represent CatchAll (long term
+  // this will get eliminated, but for now it's convenient)
+  CatchAll = Undefined,
+
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~~ Functionality Keys ~~~~~~~~~~~~~~~~~~~~~~ //
+  // Every value in the enum (up to EndOfFunctionalityKeys)
+  // corresponds to an individual "functionality" that can be dispatched to.
+  // This is represented in the DispatchKeySet by assigning each of these enum
+  // values
+  // to each of the remaining (64 - len(BackendComponent)) bits.
+  //
+  // Most of these functionalities have a single handler assigned to them,
+  // making them "runtime keys".
+  // That map to a single slot in the runtime operator table.
+  //
+  // A few functionalities are allowed to be customizable per backend.
+  // See [Note: Per-Backend Functionality Dispatch Keys] for details.
+
+  // See [Note: Per-Backend Functionality Dispatch Keys]
+  Dense,
+
+  // Below are non-extensible backends.
+  // These are backends that currently don't have their own overrides for
+  // Autograd/Sparse/Quantized kernels,
+  // and we therefore don't waste space in the runtime operator table allocating
+  // space for them.
+  // If any of these backends ever need to customize, e.g., Autograd, then we'll
+  // need to add a DispatchKey::*Bit for them.
+
+  // TODO: put this in BackendComponents
+  FPGA, // Xilinx support lives out of tree at
+  // https://gitlab.com/pytorch-complex/vitis_kernels
+
+  // TODO: put this in BackendComponents
+  // MAIA backend lives out of tree
+  // - test/cpp_extensions/maia_extension.cpp
+  // - test/test_torch.py
+  // - aten/src/ATen/test/extension_backend_test.cpp
+  MAIA,
+
+  Vulkan, // TODO: put this in BackendComponents
+  Metal, // TODO: put this in BackendComponents
+
+  // See [Note: Per-Backend Functionality Dispatch Keys]
+  Quantized,
+
+  // This backend is to support custom RNGs; it lets you go
+  // to a different kernel if you pass in a generator that is not a
+  // traditional CPUGeneratorImpl/CUDAGeneratorImpl.  To make use of this
+  // key:
+  //  1) set it as a second parameter of at::Generator constructor call in
+  //     the user-defined PRNG class.
+  //  2) use it as a dispatch key while registering custom kernels
+  //     (templatized kernels specialized for user-defined PRNG class)
+  // intended for out of tree use; tested by aten/src/ATen/test/rng_test.cpp
+  CustomRNGKeyId,
+
+  // TODO: Make Mkldnn a functionality key, so we can give it Meta
+  // support
+  // Here are backends which specify more specialized operators
+  // based on the layout of the tensor.  Note that the sparse backends
+  // are one case where ordering matters: sparse multi-dispatches with
+  // the corresponding dense tensors, and must be handled before them.
+  MkldnnCPU, // registered at build/aten/src/ATen/RegisterMkldnnCPU.cpp
+  // NB: not to be confused with MKLDNN, which is Caffe2 only
+
+  // See [Note: Per-Backend Functionality Dispatch Keys]
+  Sparse,
+
+  SparseCsr,
+
+  NestedTensor,
+
+  // In some situations, it is not immediately obvious what the correct
+  // backend for function is, because the function in question doesn't
+  // have any "tensor" arguments.  In this case, a BackendSelect function
+  // can be registered to implement the custom determination of the
+  // correct backend.
+  BackendSelect,
+
+  Python,
+
+  // Out-of-core key for Fake Tensor in torchdistx.
+  // See https://pytorch.org/torchdistx/latest/fake_tensor.html
+  // TODO: delete this in favor of Python-implemented fake tensor
+  Fake,
+  // See Note [Out-of-tree vmap+grad prototype]. The purpose of this key
+  // is to insert code after the "autograd subsystem" runs, so this key should
+  // be directly after ADInplaceOrView and all of the autograd keys.
+  FuncTorchDynamicLayerBackMode,
+
+  // Alias and mutation removal.
+  // If some backends want to opt into only alias removal or only mutation
+  // removal,
+  // we can consider adding separate keys dedicated to those individual passes.
+  // See Note [Functionalization Pass In Core] for details.
+  Functionalize,
+
+  // The named dispatch key is set for any tensors with named dimensions.
+  // Although we have a dispatch key for named tensors, for historical reasons,
+  // this dispatch key doesn't do any of the substantive functionality for named
+  // tensor (though, hypothetically, it could!)  At the moment, it's just
+  // responsible for letting us give good error messages when operations
+  // don't support named tensors.
+  //
+  // NB: If you ever consider moving named tensor functionality into
+  // this dispatch key, note that it might be necessary add another dispatch
+  // key that triggers before composite operators, in case a composite operator
+  // has named dimension propagation that doesn't match that of its
+  // constituent parts.
+  // TODO: delete this once torchdim lands in functorch
+  Named,
+
+  // The Conjugate dispatch key is set for any tensors that need to perform
+  // conjugation
+  // This is implemented at a dispatch level right before any backends run
+  Conjugate,
+
+  // The Negative dispatch key is set for any tensors that need to perform
+  // negation
+  // This is implemented at a dispatch level right before any backends run
+  Negative,
+
+  ZeroTensor, // registered at build/aten/src/ATen/RegisterZeroTensor.cpp
+
+  // Note [ADInplaceOrView key]
+  // ADInplaceOrView key is used by inplace or view ops to register a kernel
+  // that does additional setup for future autograd computation.
+  //
+  // 1. For inplace ops this kernel does version bump
+  // 2. For view ops this kernel does `as_view` setup where we properly setup
+  //    DifferentiableViewMeta on the view tensors.
+  //
+  // For other ops it's fallthrough kernel since there's no extra
+  // work to do.
+  //
+  // Note [Dream: skip VariableType kernel when requires_grad=false]
+  //
+  // In an ideal world where we can skip VariableType kernel for inputs
+  // with requires_grad=false, instead of a fallthrough kernel, we'll
+  // register a kernel shown below to all functional ops as well:
+  // torch::Tensor my_functional_op(...) {
+  //   {
+  //     // Note for every op in VariableType, you need to go through
+  //     // `AutoDispatchBelowADInplaceOrView` guard exactly once to add the
+  //     // key to TLS excluded set. If you don't go through it at all,
+  //     // inplace/view ops called through `at::` inside your backend
+  //     // kernel will dispatch to ADInplaceOrView kernels and do a lot
+  //     // of extra work.
+  //     at::AutoDispatchBelowADInplaceOrView guard;
+  //     at::redispatch::my_functional_op(...);
+  //   }
+  // }
+  // But this work is currently blocked since it adds an extra dispatch
+  // for all ops and it's non-trivial overhead at model level(a few percents).
+  // Thus our current approach takes advantage of the fact every kernel go
+  // through VariableType kernel first and pulls the
+  // `at::AutoDispatchBelowADInplaceOrView` guard of functional ops
+  // up to the `VariableType` kernel. Thus we only add the extra dispatch
+  // to view/inplace ops to minimize its perf impact to real models.
+  ADInplaceOrView,
+  // Note [Alias Dispatch Key : Autograd]
+  // All backends are oblivious to autograd; autograd is handled as a
+  // layer which happens on top of all backends. It inspects the autograd
+  // metadata of all inputs, determines what autograd metadata should be
+  // constructed by the output, and otherwise defers to the backend to
+  // actually do the numeric computation.  Autograd contains
+  // the bulk of this logic.
+
+  // Autograd is now an alias dispatch key which by default maps to all
+  // backend-specific autograd keys.
+  // Backend-specific allow backends to override the default kernel registered
+  // to Autograd key as needed.
+  // For example, XLA wants to define autograd for einsum directly.
+  // Registering a custom autograd implementation at the XLA key won't work
+  // because we process Autograd before XLA.  This key has higher priority and
+  // gets processed first.  You generally should NOT redispatch after handling
+  // autograd here (since that would result in execution of the Autograd
+  // operator, which you're trying to skip).  In AutogradXLA implementations,
+  // you are responsible for handling autograd yourself, or deferring to other
+  // operators which support autograd.
+
+  // Currently we only have backend-specific autograd keys for CPU/CUDA/XLA and
+  // reserved user-defined backends. All other in-tree backends share the
+  // AutogradOther key. We can add specific autograd key for those backends
+  // upon request.
+  AutogradOther,
+
+  // See [Note: Per-Backend Functionality Dispatch Keys]
+  AutogradFunctionality,
+
+  // NestedTensor is an example of something that isn't a "real backend"
+  // (because it mostly consists of redispatching kernels)
+  // but it would like to override autograd functionality in C++.
+  // We can handle cases like this by adding an extra functionality key
+  // exclusively for handling autograd for NestedTensor.
+  // lives out of tree at
+  // https://github.com/pytorch/nestedtensor
+  AutogradNestedTensor,
+
+  Tracer,
+
+  // TODO: make Autocast a functionality key
+  // Autocasting precedes VariableTypeId, to ensure casts are autograd-exposed
+  // and inputs are saved for backward in the post-autocast type.
+  AutocastCPU,
+  AutocastXPU,
+  AutocastIPU,
+  AutocastHPU,
+  AutocastXLA,
+  // AutocastXLA is only being used for TPUs. XLA GPUs continue to use
+  // AutocastCUDA.
+  AutocastMPS,
+  AutocastCUDA,
+  AutocastPrivateUse1,
+
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ WRAPPERS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
+  // There are a number of alternative modes which may want to handle before
+  // autograd; for example, error checking, tracing, profiling or vmap.  They
+  // go here.
+
+  FuncTorchBatched, // See Note [Out-of-tree vmap+grad prototype]
+
+  // Dispatch key for BatchedTensorImpl wrapping a nested tensor.
+  BatchedNestedTensor,
+
+  FuncTorchVmapMode, // See Note [Out-of-tree vmap+grad prototype]
+
+  // This is the dispatch key for BatchedTensorImpl, which is used to implement
+  // batching rules for vmap.
+  Batched,
+
+  // When we are inside a vmap, all tensors dispatch on this key.
+  // See Note: [DispatchKey::VmapMode usage] for more details.
+  VmapMode,
+
+  FuncTorchGradWrapper, // See Note [Out-of-tree vmap+grad prototype]
+
+  // Out-of-core key for Deferred Module Initialization in torchdistx.
+  // See https://pytorch.org/torchdistx/latest/deferred_init.html
+  DeferredInit,
+
+  // Used by Python key logic to know the set of tls on entry to the dispatcher
+  // This kernel assumes it is the top-most non-functorch-related DispatchKey.
+  // If you add a key above, make sure to update the fallback implementation for
+  // this.
+  PythonTLSSnapshot,
+
+  // This key should be at the very top of the dispatcher
+  FuncTorchDynamicLayerFrontMode, // See Note [Out-of-tree vmap+grad prototype]
+
+  // TESTING: This is intended to be a generic testing tensor type id.
+  // Don't use it for anything real; its only acceptable use is within a single
+  // process test.  Use it by creating a TensorImpl with this DispatchKey, and
+  // then registering operators to operate on this type id.  See
+  // aten/src/ATen/core/dispatch/backend_fallback_test.cpp for a usage example.
+  TESTING_ONLY_GenericWrapper,
+
+  // TESTING: This is intended to be a generic testing tensor type id.
+  // Don't use it for anything real; its only acceptable use is within a ingle
+  // process test.  Use it by toggling the mode on and off via
+  // TESTING_ONLY_tls_generic_mode_set_enabled and then registering operators
+  // to operate on this type id.  See
+  // aten/src/ATen/core/dispatch/backend_fallback_test.cpp
+  // for a usage example
+  TESTING_ONLY_GenericMode,
+
+  // This key is used for pre-dispatch tracing in make_fx.
+  // It has lower priority than the PythonDispatcher key
+  // because we use the PythonDispatcher to intercept the key from python,
+  // and avoid having to implement it in C++.
+  PreDispatch,
+
+  // This is a bypass that allows you to skip running the C++ dispatcher
+  // entirely
+  PythonDispatcher,
+
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ FIN ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
+  EndOfFunctionalityKeys, // End of functionality keys.
+
+// ~~~~~~~~~~~~~~ "Dense" Per-Backend Dispatch keys ~~~~~~~~~~~~~~~~~~~~ //
+// Here are backends which you think of as traditionally specifying
+// how to implement operations on some device.
+
+#define DEFINE_PER_BACKEND_KEYS_FOR_BACKEND(n, prefix) prefix##n,
+
+#define DEFINE_PER_BACKEND_KEYS(fullname, prefix)      \
+  StartOf##fullname##Backends,                         \
+      C10_FORALL_BACKEND_COMPONENTS(                   \
+          DEFINE_PER_BACKEND_KEYS_FOR_BACKEND, prefix) \
+          EndOf##fullname##Backends = prefix##Meta,
+
+  C10_FORALL_FUNCTIONALITY_KEYS(DEFINE_PER_BACKEND_KEYS)
+
+#undef DEFINE_PER_BACKEND_KEYS
+#undef DEFINE_PER_BACKEND_KEYS_FOR_BACKEND
+
+      EndOfRuntimeBackendKeys = EndOfAutogradFunctionalityBackends,
+
+  // ~~~~~~~~~~~~~~~~~~~~~~ Alias Dispatch Keys ~~~~~~~~~~~~~~~~~~~~~~~~~~ //
+  // Note [Alias Dispatch Keys]
+  // Alias dispatch keys are synthetic dispatch keys which map to multiple
+  // runtime dispatch keys. Alisa keys have precedence, but they are always
+  // lower precedence than runtime keys. You can register a kernel to an
+  // alias key, the kernel might be populated to the mapped runtime keys
+  // during dispatch table computation.
+  // If a runtime dispatch key has multiple kernels from alias keys, which
+  // kernel wins is done based on the precedence of alias keys (but runtime
+  // keys always have precedence over alias keys).
+  // Alias keys won't be directly called during runtime.
+
+  // See Note [Alias Dispatch Key : Autograd]
+  Autograd,
+  CompositeImplicitAutograd, // registered at
+  // build/aten/src/ATen/RegisterCompositeImplicitAutograd.cpp
+
+  // Note: The alias keyset for FuncTorchBatchedDecomposition is disjoint from
+  // all
+  // other alias keysets
+  // and so precedence order doesn't matter
+  FuncTorchBatchedDecomposition, // registered at
+  // build/aten/src/ATen/RegisterFuncTorchBatchedDecomposition.cpp
+  // Note: The alias keyset for CompositeImplicitAutogradNestedTensor is
+  // disjoint from all other alias keysets
+  CompositeImplicitAutogradNestedTensor, // registered at
+  // build/aten/src/ATen/RegisterCompositeImplicitAutogradNestedTensor.cpp
+  CompositeExplicitAutograd, // registered at
+  // build/aten/src/ATen/RegisterCompositeExplicitAutograd.cpp
+  // See Note [CompositeExplicitAutogradNonFunctional Key]
+  CompositeExplicitAutogradNonFunctional, // registered at
+  // build/aten/src/ATen/RegisterCompositeExplicitAutograd.cpp
+
+  // Define an alias key to represent end of alias dispatch keys.
+  // If you add new alias keys after Autograd, please also update it here.
+  StartOfAliasKeys = Autograd,
+  EndOfAliasKeys = CompositeExplicitAutogradNonFunctional, //
+
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~ BC ALIASES ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
+  // The aliases exist for backwards compatibility reasons, they shouldn't
+  // be used
+  CPUTensorId = CPU,
+  CUDATensorId = CUDA,
+  DefaultBackend = CompositeExplicitAutograd,
+  PrivateUse1_PreAutograd = AutogradPrivateUse1,
+  PrivateUse2_PreAutograd = AutogradPrivateUse2,
+  PrivateUse3_PreAutograd = AutogradPrivateUse3,
+  Autocast = AutocastCUDA,
+};
+
+// Note [Private use DispatchKey]
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Private use tensor IDs are preallocated tensor type IDs for use in user
+// applications.  Similar to private use fields in HTTP, they can be used
+// by end users for experimental or private applications, without needing
+// to "standardize" the tensor ID (which would be done by submitting a PR
+// to PyTorch to add your type ID).
+//
+// Private use tensor IDs are appropriate to use if you want to experiment
+// with adding a new tensor type (without having to patch PyTorch first) or
+// have a private, non-distributed application that needs to make use of a
+// new tensor type.  Private use tensor IDs are NOT appropriate to use for
+// libraries intended to be distributed to further users: please contact
+// the PyTorch developers to get a type ID registered in this case.
+//
+// We provide two classes of private user tensor id: regular DispatchKeys
+// and Autograd DispatchKeys.  DispatchKeys serve the role of ordinary "backend"
+// DispatchKeys; if you were adding support for a new type of accelerator, you
+// would use a backend DispatchKey, and ideally automatically reuse
+// AutogradOther definitions already defined in PyTorch.  AutogradPrivateUse
+// DispatchKeys serve as "wrapper" DispatchKeys: they are only necessary for
+// tensors that compose multiple internal tensors, and for cases when the
+// built-in autograd formulas for operators are not appropriate.
+
+static_assert(
+    (static_cast<uint8_t>(BackendComponent::EndOfBackendKeys) +
+     static_cast<uint8_t>(DispatchKey::EndOfFunctionalityKeys)) <= 64,
+    "The BackendComponent and DispatchKey enums (below EndOfFunctionalityKeys)"
+    " both map to backend and functionality bits"
+    " into a 64-bit bitmask; you must have less than 64 total entries between them");
+
+// Check if a DispatchKey is an alias mapping to other runtime keys.
+constexpr bool isAliasDispatchKey(DispatchKey k) {
+  return k >= DispatchKey::StartOfAliasKeys && k <= DispatchKey::EndOfAliasKeys;
+}
+
+// [Note: Per-Backend Functionality Dispatch Keys]
+// Check if a DispatchKey is a per-backend functionality key
+// Any functionalities that can be customized per-backend should be added here.
+// These keys correspond to functionalities that can be customized individually
+// per backend. While they only take up one bit in the `DispatchKeySet` bitset,
+// they map to (# backends) slots in the operator table.
+// Each of these keys also has a separate set of "runtime keys" in the dispatch
+// key enum, per backend, which *do* map to the individual operator table slots.
+// For example, the "Sparse" key maps to an individual bit in the
+// DispatchKeySet, while `SparseCPU`, `SparseCUDA`, etc all map to individual
+// slots in the runtime operator table.
+
+constexpr bool isPerBackendFunctionalityKey(DispatchKey k) {
+  if (k == DispatchKey::Dense || k == DispatchKey::Quantized ||
+      k == DispatchKey::Sparse || k == DispatchKey::SparseCsr ||
+      k == DispatchKey::AutogradFunctionality ||
+      k == DispatchKey::NestedTensor) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+// Note that this includes Undefined in the total count.
+// BUT EndOfFunctionalityKeys is its own (placeholder) key.
+// e.g. Undefined=0, Dense=1, Sparse=2, EndOfFunctionalityKeys=3.
+// In the above example, there are 3 total functionality keys.
+constexpr uint8_t num_functionality_keys =
+    static_cast<uint8_t>(DispatchKey::EndOfFunctionalityKeys);
+
+constexpr uint8_t num_backends =
+    static_cast<uint8_t>(BackendComponent::EndOfBackendKeys);
+
+// Note [No More Than 16 Backends]
+// Search for this note to find places in the code where the "no more than 16
+// backends" invariant is baked in.
+static_assert(
+    static_cast<uint8_t>(BackendComponent::EndOfBackendKeys) <= 16,
+    "BackendComponent currently only supports <= 16 backends. If we really need to extend this, \
+there are a few places where this invariant is baked in");
+
+constexpr uint8_t numPerBackendFunctionalityKeys() {
+  uint8_t count = 0;
+  for (uint8_t k = 0; k <= num_functionality_keys; ++k) {
+    if (isPerBackendFunctionalityKey(static_cast<DispatchKey>(k)))
+      ++count;
+  }
+  return count;
+}
+
+#if defined(C10_MOBILE_TRIM_DISPATCH_KEYS)
+// See [Note: Trimmed Mobile Dispatch Keys]
+constexpr uint16_t num_runtime_entries = 8;
+#else
+constexpr uint16_t num_runtime_entries = num_functionality_keys +
+    (numPerBackendFunctionalityKeys() * (num_backends - 1));
+#endif
+
+// See Note [No More Than 16 Backends]
+constexpr uint16_t full_backend_mask =
+    (static_cast<uint16_t>(1) << num_backends) - 1;
+
+C10_API const char* toString(DispatchKey);
+C10_API const char* toString(BackendComponent);
+C10_API std::ostream& operator<<(std::ostream&, DispatchKey);
+C10_API std::ostream& operator<<(std::ostream&, BackendComponent);
+
+C10_API DispatchKey getAutogradKeyFromBackend(BackendComponent k);
+
+// Parses a string into a dispatch key.
+// If the string cannot be correctly parsed, throws an exception.
+C10_API c10::DispatchKey parseDispatchKey(const std::string& k);
+
+// These are some convenience identifiers for dispatch keys which are
+// shorter to type than their long counterparts.  Note that some of these
+// dispatch keys directly correspond to DeviceType; and most APIs that
+// accept DispatchKey also accept DeviceType; e.g.,
+// torch::dispatch(torch::kCPU, ...) is also valid.
+constexpr DispatchKey kAutograd = DispatchKey::Autograd;
+
+// See Note [The Ordering of Per-Backend Dispatch Keys Matters!]
+// This function relies on the invariant that the dispatch keys between
+// StartOfDenseBackends and EndOfRuntimeBackendKeys are ordered by backend
+// in the same order as `BackendComponent`.
+constexpr BackendComponent toBackendComponent(DispatchKey k) {
+  if (k >= DispatchKey::StartOfDenseBackends &&
+      k <= DispatchKey::EndOfDenseBackends) {
+    return static_cast<BackendComponent>(
+        static_cast<uint8_t>(k) -
+        static_cast<uint8_t>(DispatchKey::StartOfDenseBackends));
+  } else if (
+      k >= DispatchKey::StartOfQuantizedBackends &&
+      k <= DispatchKey::EndOfQuantizedBackends) {
+    return static_cast<BackendComponent>(
+        static_cast<uint8_t>(k) -
+        static_cast<uint8_t>(DispatchKey::StartOfQuantizedBackends));
+  } else if (
+      k >= DispatchKey::StartOfSparseBackends &&
+      k <= DispatchKey::EndOfSparseBackends) {
+    return static_cast<BackendComponent>(
+        static_cast<uint8_t>(k) -
+        static_cast<uint8_t>(DispatchKey::StartOfSparseBackends));
+  } else if (
+      k >= DispatchKey::StartOfSparseCsrBackends &&
+      k <= DispatchKey::EndOfSparseCsrBackends) {
+    return static_cast<BackendComponent>(
+        static_cast<uint8_t>(k) -
+        static_cast<uint8_t>(DispatchKey::StartOfSparseCsrBackends));
+  } else if (
+      k >= DispatchKey::StartOfNestedTensorBackends &&
+      k <= DispatchKey::EndOfNestedTensorBackends) {
+    return static_cast<BackendComponent>(
+        static_cast<uint8_t>(k) -
+        static_cast<uint8_t>(DispatchKey::StartOfNestedTensorBackends));
+  } else if (
+      k >= DispatchKey::StartOfAutogradFunctionalityBackends &&
+      k <= DispatchKey::EndOfAutogradFunctionalityBackends) {
+    return static_cast<BackendComponent>(
+        static_cast<uint8_t>(k) -
+        static_cast<uint8_t>(
+            DispatchKey::StartOfAutogradFunctionalityBackends));
+  } else {
+    return BackendComponent::InvalidBit;
+  }
+}
+
+constexpr DispatchKey toFunctionalityKey(DispatchKey k) {
+  if (k <= DispatchKey::EndOfFunctionalityKeys) {
+    return k;
+  } else if (k <= DispatchKey::EndOfDenseBackends) {
+    return DispatchKey::Dense;
+  } else if (k <= DispatchKey::EndOfQuantizedBackends) {
+    return DispatchKey::Quantized;
+  } else if (k <= DispatchKey::EndOfSparseBackends) {
+    return DispatchKey::Sparse;
+  } else if (k <= DispatchKey::EndOfSparseCsrBackends) {
+    return DispatchKey::SparseCsr;
+  } else if (k <= DispatchKey::EndOfNestedTensorBackends) {
+    return DispatchKey::NestedTensor;
+  } else if (k <= DispatchKey::EndOfAutogradFunctionalityBackends) {
+    return DispatchKey::AutogradFunctionality;
+  } else {
+    return DispatchKey::Undefined;
+  }
+}
+
+BackendComponent toBackendComponent(DeviceType device_type);
+
+// Given (DispatchKey::Dense, BackendComponent::CUDABit), returns
+// DispatchKey::CUDA.
+// See Note [The Ordering of Per-Backend Dispatch Keys Matters!]
+// This function relies on the invariant that the dispatch keys between
+// StartOfDenseBackends and EndOfRuntimeBackendKeys are ordered by backend
+// in the same order as `BackendComponent`.
+constexpr DispatchKey toRuntimePerBackendFunctionalityKey(
+    DispatchKey functionality_k,
+    BackendComponent backend_k) {
+  if (functionality_k == DispatchKey::Dense) {
+    return static_cast<DispatchKey>(
+        static_cast<uint8_t>(DispatchKey::StartOfDenseBackends) +
+        static_cast<uint8_t>(backend_k));
+  }
+  if (functionality_k == DispatchKey::Sparse) {
+    return static_cast<DispatchKey>(
+        static_cast<uint8_t>(DispatchKey::StartOfSparseBackends) +
+        static_cast<uint8_t>(backend_k));
+  }
+  if (functionality_k == DispatchKey::SparseCsr) {
+    return static_cast<DispatchKey>(
+        static_cast<uint8_t>(DispatchKey::StartOfSparseCsrBackends) +
+        static_cast<uint8_t>(backend_k));
+  }
+  if (functionality_k == DispatchKey::Quantized) {
+    return static_cast<DispatchKey>(
+        static_cast<uint8_t>(DispatchKey::StartOfQuantizedBackends) +
+        static_cast<uint8_t>(backend_k));
+  }
+  if (functionality_k == DispatchKey::NestedTensor) {
+    return static_cast<DispatchKey>(
+        static_cast<uint8_t>(DispatchKey::StartOfNestedTensorBackends) +
+        static_cast<uint8_t>(backend_k));
+  }
+  if (functionality_k == DispatchKey::AutogradFunctionality) {
+    return static_cast<DispatchKey>(
+        static_cast<uint8_t>(
+            DispatchKey::StartOfAutogradFunctionalityBackends) +
+        static_cast<uint8_t>(backend_k));
+  }
+  return DispatchKey::Undefined;
+}
+
+} // namespace c10
+
+namespace torch {
+// Expose the constant, but not the TYPE (DispatchKey is an implementation
+// detail!)
+// NOLINTNEXTLINE(misc-unused-using-decls)
+using c10::kAutograd;
+} // namespace torch
+
+// NB: You really shouldn't use this instance; this enum is guaranteed
+// to be pretty small so a regular array should be acceptable.
+namespace std {
+template <>
+struct hash<c10::DispatchKey> {
+  typedef size_t result_type;
+  typedef c10::DispatchKey argument_type;
+
+  size_t operator()(c10::DispatchKey x) const {
+    return static_cast<size_t>(x);
+  }
+};
+} // namespace std

videochat2/lib/python3.10/site-packages/torch/include/c10/core/DispatchKeySet.h

@@ -0,0 +1,949 @@
+#pragma once
+#include <c10/core/DispatchKey.h>
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Exception.h>
+#include <c10/util/Metaprogramming.h>
+#include <c10/util/TypeList.h>
+#include <c10/util/llvmMathExtras.h>
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <initializer_list>
+#include <iterator>
+#include <ostream>
+#include <string>
+#include <type_traits>
+
+namespace c10 {
+
+struct FunctionalityOffsetAndMask {
+  // empty constructor shouldn't be used; only needed to initialize
+  // the array before populating it.
+  FunctionalityOffsetAndMask() = default;
+  FunctionalityOffsetAndMask(uint16_t offset, uint16_t mask)
+      : offset(offset), mask(mask) {}
+  // This needs to big enough to cover the size of the operator table.
+  uint16_t offset{};
+  // See Note [No More Than 16 Backends]
+  // This mask needs to be big enough to mask all of the backend bits.
+  // We probably don't ever want to have more than 16 backend bits, so uint16_t
+  // should be enough.
+  uint16_t mask{};
+};
+static_assert(
+    c10::num_runtime_entries < 65536,
+    "The dispatcher currently only supports up to 2^16 runtime entries");
+
+C10_API std::array<FunctionalityOffsetAndMask, num_functionality_keys>
+initializeFunctionalityOffsetsAndMasks();
+
+C10_ALWAYS_INLINE static const std::
+    array<FunctionalityOffsetAndMask, num_functionality_keys>&
+    offsetsAndMasks() {
+  static auto offsets_and_masks_ = initializeFunctionalityOffsetsAndMasks();
+  return offsets_and_masks_;
+}
+
+// A representation of a set of DispatchKeys. A DispatchKeySet contains both
+// "functionality" bits and "backend bits", and every tensor holds its own
+// DispatchKeySet. The Dispatcher implements multiple dispatch by grabbing the
+// keyset on every input tensor, or’ing them together, and dispatching to a
+// specific piece of functionality. The functionality bits are *ordered*. When
+// multiple functionality bits are set, we use the highest priority
+// functionality. Similarly, multiple backend bits can theoretically be set if
+// you call an operator with multiple tensors from difference devices (e.g. CPU
+// and CUDA), although support for mixed device dispatch is limited (the only
+// kernels that gracefully handle mixed device inputs for now are cuda kernels
+// that take in a scalar cpu tensor).
+
+// A representation of a set of DispatchKeys.  A tensor may have multiple
+// tensor type ids, e.g., a Variable tensor can also be a CPU tensor; the
+// DispatchKeySet specifies what type ids apply.  The internal representation is
+// as a 64-bit bit set (this means only 64 tensor type ids are supported).
+//
+// As mentioned above, DispatchKeys are ordered; thus, we can ask questions like
+// "what is the highest priority DispatchKey in the set"?  (The set itself is
+// not ordered; two sets with the same ids will always have the ids ordered in
+// the same way.)
+//
+// Note [DispatchKeySet Internal Representation]
+// Internally, dispatch keys are packed into 64-bit DispatchKeySet objects
+// that get passed around at runtime.
+// However, there isn't necessarily a 1-to-1 mapping between bits in the keyset
+// and individual dispatch keys.
+//
+// First: why do we have this distinction, and why not map every dispatch key
+// directly to a bit? This is mostly because we have several types of
+// functionalities that different backends would like to customize. For example,
+// we have:
+// - "Dense":     CPU, CUDA, XLA, ... (~12 keys)
+// - "Sparse":    SparseCPU, SparseCUDA, ...
+// - "SparseCsr": SparseCsrCPU, SparseCsrCUDA, ...
+// - "Quantized": QuantizedCPU, QuantizedCUDA, QuantizedXLA, ...
+// - "Autograd":  AutogradCPU, AutogradCUDA, Autograd XLA, ...
+// The problem is that total number of keys grows quadratically with [#
+// backends] x [# functionalities], making it very difficult to map each key
+// directly to a bit in a bitset without dramatically increasing the size of the
+// bitset over time.
+//
+// The two enums (BackendComponent and DispatchKey) can be divided roughly into
+// 5 categories.
+//
+// (1) "Building block" keys
+//    (a) backends: Everything in the BackendComponent enum (e.g. CPUBit,
+//    CUDABit) (b) functionalities: (per-backend) functionality-bit DispatchKeys
+//    (e.g. AutogradFunctionality, SparseCsr, Sparse, Dense)
+// (2) "Runtime" keys
+//    (a) "non-customizable backends" (e.g. FPGA)
+//    (b) "non-customizable functionalities" (e.g. Functionalize)
+//    (c) "per-backend instances of customizable functionalities" (e.g. CPU,
+//    SparseCPU, AutogradCPU)
+// (3) "Alias" DispatchKeys (see Note [Alias Dispatch Keys])
+//
+// (1) Building block keys always correspond to individual bits in a
+// DispatchKeySet. They can also be combined in a DispatchKeySet to form actual
+// runtime keys. e.g.
+//     auto dense_cpu_ks = DispatchKeySet({DispatchKey::CPUBit,
+//     DispatchKey::Dense});
+//     // The keyset has the runtime dense-cpu key.
+//     dense_cpu_ks.has(DispatchKey::CPU);
+//     // And it contains the building block keys too.
+//     dense_cpu_ks.has(DispatchKey::CPUBit);
+//     dense_cpu_ks.has(DispatchKey::Dense);
+//
+// Not every backend and not every functionality counts as a "building block
+// key". This is mostly to give us more levers to pull in the design space.
+// Backend keys and functionality keys that count as "building blocks" will
+// contribute to a full cross product of functionality that can be overriden.
+//
+// For example, right now we have at least 12 "backend" building
+// blocks (CPU, CUDA, XLA, ...) and at least 5 "functionality"
+// building blocks (Dense, Sparse, SparseCsr, Quantized,
+// AutogradFunctionality, ...). These keys together allow every
+// dispatcher operator to be customized in up to 12*4 different
+// ways. Each of those requires a slot in the operator table of every
+// dispatcher operator.  Not every piece of functionality necessarily
+// needs to be customizable per-backend, and not every backend
+// necessarily needs to be able to customize every type of
+// functionality.
+//
+//
+// (2) Every runtime key corresponds directly to a slot in an operator's runtime
+// dispatch table, and you can directly register kernels to a runtime dispatch
+// key.
+//
+// For per-backend functionalities like "Dense" or "AutogradFunctionality",
+// you can think of the corresponding runtime dispatch keys as "instances" of
+// that functionality, per backend. E.g. "CPU", "CUDA", "XLA", etc. are all
+// runtime instances of the "Dense" building block key.
+
+// (2a) and (2b) are represented identically in the DispatchKeySet logic:
+// - backend-agnostic functionalities (e.g. FuncTorchBatched) are NOT
+// customizable per backend.
+//   In order to do so, we'd need to promote it to a per-backend functionality
+//   "building block" key.
+// - non-customizable backends (e.g. FPGA) can NOT customize existing
+// functionality like Sparse, Autograd, etc.
+//   In order to do so, we'd need to promote it to a backend "building block"
+//   key.
+//
+// In both cases, these keys directly correspond to runtime slots in the
+// operator table.
+//
+//
+// (3) "Alias" keys
+// See Note [Alias Dispatch Keys]
+//
+// Final note: for anyone making future changes to the Dispatcher +
+// DispatchKeySet internals, there's a closed PR with a basic
+// python-implementation of the Dispatcher that might be useful in quickly
+// testing out and validating changes. See it at
+// https://github.com/pytorch/pytorch/pull/68743
+
+// An undefined tensor is one with an empty tensor type set.
+class DispatchKeySet final {
+ public:
+  enum Full { FULL };
+  enum FullAfter { FULL_AFTER };
+  enum Raw { RAW };
+
+  // NB: default constructor representation as zero is MANDATORY as
+  // use of DispatchKeySet in TLS requires this.
+  constexpr DispatchKeySet() = default;
+
+  constexpr DispatchKeySet(Full)
+      : repr_((1ULL << (num_backends + num_functionality_keys - 1)) - 1) {}
+
+  constexpr DispatchKeySet(FullAfter, DispatchKey t)
+      // LSB after t are OK, but not t itself.
+      // "functionalities" have a notion of ordering (e.g. Autograd > Sparse >
+      // Quantized > Dense). But backends don't really have an ordering.
+      // Therefore, we're enforcing that FullAfter can only be used on
+      // "functionality" keys.
+      : repr_(
+            (1ULL
+             << (num_backends + static_cast<uint8_t>(toFunctionalityKey(t)) -
+                 1)) -
+            1) {
+    *this = add(DispatchKey::PythonDispatcher);
+  }
+
+  // Public version of DispatchKeySet(uint64_t) API; external users
+  // must be explicit when they do this!
+  constexpr DispatchKeySet(Raw, uint64_t x) : repr_(x) {}
+
+  constexpr explicit DispatchKeySet(BackendComponent k) {
+    if (k == BackendComponent::InvalidBit) {
+      repr_ = 0;
+    } else {
+      repr_ = 1ULL << (static_cast<uint8_t>(k) - 1);
+    }
+  }
+
+  constexpr explicit DispatchKeySet(DispatchKey k) {
+    // NOLINTNEXTLINE(bugprone-branch-clone)
+    if (k == DispatchKey::Undefined) {
+      // Case 1: handle Undefined specifically
+      repr_ = 0;
+    } else if (k <= DispatchKey::EndOfFunctionalityKeys) {
+      // Case 2: handle "functionality-only" keys
+      // These keys have a functionality bit set, but no backend bits
+      // These can technically be either:
+      // - valid runtime keys (e.g. DispatchKey::AutogradOther,
+      // DispatchKey::FuncTorchBatched, etc)
+      // - "building block" keys that aren't actual runtime keys (e.g.
+      // DispatchKey::Dense or Sparse)
+      uint64_t functionality_val = 1ULL
+          << (num_backends + static_cast<uint8_t>(k) - 1);
+      repr_ = functionality_val;
+    } else if (k <= DispatchKey::EndOfRuntimeBackendKeys) {
+      // Case 3: "runtime" keys that have a functionality bit AND a backend bit.
+      // First compute which bit to flip for the functionality.
+      auto functionality_k = toFunctionalityKey(k);
+      // The - 1 is because Undefined is technically a "functionality" that
+      // doesn't show up in the bitset. So e.g. Dense is technically the second
+      // functionality, but the lowest functionality bit.
+      uint64_t functionality_val = 1ULL
+          << (num_backends + static_cast<uint8_t>(functionality_k) - 1);
+
+      // then compute which bit to flip for the backend
+      // Case 4a: handle the runtime instances of "per-backend functionality"
+      // keys For example, given DispatchKey::CPU, we should set:
+      // - the Dense functionality bit
+      // - the CPUBit backend bit
+      // first compute which bit to flip for the backend
+      auto backend_k = toBackendComponent(k);
+      uint64_t backend_val = backend_k == BackendComponent::InvalidBit
+          ? 0
+          : 1ULL << (static_cast<uint8_t>(backend_k) - 1);
+      repr_ = functionality_val + backend_val;
+    } else {
+      // At this point, we should have covered every case except for alias keys.
+      // Technically it would be possible to add alias dispatch keys to a
+      // DispatchKeySet, but the semantics are a little confusing and this
+      // currently isn't needed anywhere.
+      repr_ = 0;
+    }
+  }
+
+  constexpr uint64_t keys_to_repr(std::initializer_list<DispatchKey> ks) {
+    uint64_t repr = 0;
+    for (auto k : ks) {
+      repr |= DispatchKeySet(k).repr_;
+    }
+    return repr;
+  }
+
+  constexpr uint64_t backend_bits_to_repr(
+      std::initializer_list<BackendComponent> ks) {
+    uint64_t repr = 0;
+    for (auto k : ks) {
+      repr |= DispatchKeySet(k).repr_;
+    }
+    return repr;
+  }
+
+  explicit constexpr DispatchKeySet(std::initializer_list<DispatchKey> ks)
+      : repr_(keys_to_repr(ks)) {}
+
+  explicit constexpr DispatchKeySet(std::initializer_list<BackendComponent> ks)
+      // Note: for some reason, putting this logic directly in the constructor
+      // appears to fail to compile on CUDA 10.1.
+      // See an example internal failure at
+      // https://www.internalfb.com/intern/skycastle/run/76561193669136035/artifact/actionlog.76561193742069401.stderr
+      : repr_(backend_bits_to_repr(ks)) {}
+
+  // Test if a DispatchKey is in the set
+  inline bool has(DispatchKey t) const {
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(t != DispatchKey::Undefined);
+    return has_all(DispatchKeySet(t));
+  }
+  constexpr bool has_backend(BackendComponent t) const {
+    return has_all(DispatchKeySet(t));
+  }
+
+  // Test if a DispatchKey is in the set
+  // Given a DispatchKeySet of functionality keys and (potentially) backend
+  // keys, tests if all of them are in the current set.
+  constexpr bool has_all(DispatchKeySet ks) const {
+    return static_cast<bool>((repr_ & ks.repr_) == ks.repr_);
+  }
+
+  // Given a DispatchKeySet of functionality keys and (potentially) backend
+  // keys, tests if any of them are in the current set. This could technically
+  // be pretty easily implemented using has(). It is strictly a perf
+  // optimization though. There are many places in the code base where we want
+  // to test for multiple functionality keys together. HOWEVER, runtime
+  // per-backend functionality keys aren't allowed to be used with this
+  // function, because you can end up with weird results. e.g.
+  // DispatchKeySet(DispatchKey::AutogradCPU).has_any(DispatchKeySet(DispatchKey::CPU))
+  // would return true.
+  inline bool has_any(DispatchKeySet ks) const {
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
+        // Either there are no backend bits in the input keyset
+        ((ks.repr_ & full_backend_mask) == 0) ||
+        // or there are no per-backend-functionality bits
+        // See [Note: Per-Backend Functionality Dispatch Keys]
+        ((ks &
+          DispatchKeySet({
+                             DispatchKey::Dense,
+                             DispatchKey::Quantized,
+                             DispatchKey::Sparse,
+                             DispatchKey::SparseCsr,
+                             DispatchKey::AutogradFunctionality,
+                         })
+              .repr_) == 0));
+    return static_cast<bool>((repr_ & ks.repr_) != 0);
+  }
+  // Test if DispatchKeySet is a superset of ks.
+  bool isSupersetOf(DispatchKeySet ks) const {
+    return (repr_ & ks.repr_) == ks.repr_;
+  }
+  // Perform set union
+  constexpr DispatchKeySet operator|(DispatchKeySet other) const {
+    return DispatchKeySet(repr_ | other.repr_);
+  }
+  // Perform set intersection
+  constexpr DispatchKeySet operator&(DispatchKeySet other) const {
+    return DispatchKeySet(repr_ & other.repr_);
+  }
+  // Compute the set difference self - other,
+  // but ONLY for the functionality keys.
+  // Any backend bits set on self will remain unchanged.
+  // See Note [Removing keys from DispatchKeySet Only Affects Functionality
+  // Keys]
+  constexpr DispatchKeySet operator-(DispatchKeySet other) const {
+    return DispatchKeySet(repr_ & (full_backend_mask | ~other.repr_));
+  }
+
+  // Compute self ^ other
+  constexpr DispatchKeySet operator^(DispatchKeySet other) const {
+    return DispatchKeySet(repr_ ^ other.repr_);
+  }
+  bool operator==(DispatchKeySet other) const {
+    return repr_ == other.repr_;
+  }
+  bool operator!=(DispatchKeySet other) const {
+    return repr_ != other.repr_;
+  }
+  // Add a DispatchKey to the DispatchKey set.  Does NOT mutate,
+  // returns the extended DispatchKeySet!
+  C10_NODISCARD constexpr DispatchKeySet add(DispatchKey t) const {
+    return *this | DispatchKeySet(t);
+  }
+  C10_NODISCARD constexpr DispatchKeySet add(DispatchKeySet ks) const {
+    return *this | ks;
+  }
+
+  // Remove a DispatchKey from the DispatchKey set.
+  // This is generally not an operation you should be doing
+  // (it's used to implement the printing overload, operator<<)
+  //
+  // Note [Removing keys from DispatchKeySet Only Affects Functionality Keys]
+  // Only functionality bits are allowed to be removed from a keyset.
+  // For now, we're only allowing removal of "functionality bits" from the
+  // keyset, which is specifically needed by the fallthrough key calculation
+  // logic. Why is removing backend bits problematic? Consider this example:
+  //
+  // DispatchKeySet([DispatchKey.CPU, DispatchKey.AutogradCUDA,
+  // DispatchKey.CUDA]).remove(DispatchKey.AutogradCUDA)
+  // DispatchKeySet([DispatchKey.CPU,
+  // DispatchKey.AutogradCUDA]).remove(DispatchKey.AutogradCUDA)
+  //
+  // What do we want to happen?
+  // Technically, we'd like it to be true that after removal,
+  // the first keyset still has the CUDA dispatch key while the second doesn't.
+  // Unfortunately there's no way to represent that, because the two keysets are
+  // represented the same way internally: functionality bits: Autograd, Dense
+  // backend bits: CPU, CUDA
+  //
+  // Instead, remove(DispatchKey.AutogradCPU) will only remove the "Autograd"
+  // bit from the bitset.
+  C10_NODISCARD constexpr DispatchKeySet remove(DispatchKey t) const {
+    return DispatchKeySet(
+        repr_ & ~(DispatchKeySet(t).repr_ & ~full_backend_mask));
+  }
+  // You're allowed to remove a backend bit from a DispatchKeySet,
+  // but you have to be explicit about it (remove_backend() instead of
+  // remove()).
+  constexpr DispatchKeySet remove_backend(BackendComponent b) const {
+    return DispatchKeySet(repr_ & ~(DispatchKeySet(b).repr_));
+  }
+  // Is the set empty?  (AKA undefined tensor)
+  bool empty() const {
+    return repr_ == 0;
+  }
+  uint64_t raw_repr() {
+    return repr_;
+  }
+
+  DispatchKey highestFunctionalityKey() const {
+    auto functionality_idx = indexOfHighestBit();
+    // This means that none of the functionality bits were set.
+    if (functionality_idx < num_backends)
+      return DispatchKey::Undefined;
+    // The first num_backend bits in the keyset don't correspond to real
+    // dispatch keys.
+    return static_cast<DispatchKey>(functionality_idx - num_backends);
+  }
+
+  // This is similar like toBackendComponent(DispatchKey), but less restrictive.
+  // toBackendComponent() errors out if the key that it was passed has no
+  // backend bits, which is useful for error checking. We need a version of that
+  // here that can also handle "fake" backends like FPGA, because they need to
+  // map to the AutogradOther key. For those backends, we return
+  // BackendComponent::InvalidBit.
+  BackendComponent highestBackendKey() const {
+    // mask to mask out functionality bits
+    auto backend_idx =
+        DispatchKeySet(repr_ & full_backend_mask).indexOfHighestBit();
+    // all zeros across the backend bits means that no backend bits are set.
+    if (backend_idx == 0)
+      return BackendComponent::InvalidBit;
+    return static_cast<BackendComponent>(backend_idx);
+  }
+
+  // returns the DispatchKey of highest priority in the set.
+  DispatchKey highestPriorityTypeId() const {
+    auto functionality_k = highestFunctionalityKey();
+    if (isPerBackendFunctionalityKey(functionality_k)) {
+      return toRuntimePerBackendFunctionalityKey(
+          functionality_k, highestBackendKey());
+    }
+    return functionality_k;
+  }
+
+  // Returns the index of the most-significant bit in the keyset.
+  // This is used to as part of the calculation into the operator table to get:
+  // - the highest "functionality" bit in the keyset.
+  // - the highest "backend" bit in the keyset.
+  uint8_t indexOfHighestBit() const {
+    return 64 - llvm::countLeadingZeros(repr_);
+  }
+
+#if defined(C10_MOBILE_TRIM_DISPATCH_KEYS)
+  // [Note: Trimmed Mobile Dispatch Keys]
+  /**
+   * The method below maps the dispatch key in the enum DispatchKey to an
+   * integer index in the dispatchTable_ array in OperatorEntry. The array
+   * is trimmed for mobile to reduce peak memory usage since it's
+   * unnecessary to reserve additional space for dispatch keys that will
+   * never be used on mobile.
+   */
+  int getDispatchTableIndexForDispatchKeySet() const {
+    auto dk = highestPriorityTypeId();
+    switch (dk) {
+      case DispatchKey::Undefined:
+        return 0;
+      case DispatchKey::CPU:
+        return 1;
+      case DispatchKey::QuantizedCPU:
+        return 2;
+      case DispatchKey::SparseCPU:
+        return 3;
+      case DispatchKey::BackendSelect:
+        return 4;
+      case DispatchKey::ADInplaceOrView:
+        return 5;
+      case DispatchKey::AutogradOther:
+        return 6;
+      case DispatchKey::AutogradCPU:
+        return 7;
+      default:
+        return -1;
+    }
+  }
+#else
+  // returns the index in the operator table of highest priority key in the the
+  // keyset Note that we could in theory implement this using
+  // highestPriorityTypeId(), but this code is very hotpath and we can do it
+  // faster without it.
+  int getDispatchTableIndexForDispatchKeySet() const {
+    auto functionality_idx =
+        DispatchKeySet(repr_ >> num_backends).indexOfHighestBit();
+    auto offset_and_mask = offsetsAndMasks()[functionality_idx];
+    // Mask the functionality bits out first, then right-shift by 1.
+    // right-shifting by 1 because everything is zero-indexed.
+    // E.g. 000001 (CPU) should give us an offset of 0, 000010 (CUDA) should
+    // give us an offset of 1, etc.
+    auto backend_idx =
+        DispatchKeySet((repr_ & offset_and_mask.mask) >> 1).indexOfHighestBit();
+    return offset_and_mask.offset + backend_idx;
+  }
+#endif
+
+  // returns the "index" of the highest priority backend in the keyset.
+  // This is pretty similar to getBackendKey(), but:
+  // - It's hotpath code (part of the runtime bitset calculation)
+  // - I's returns an integer index, not an enum value
+  // - Everything is shifted to the right by 1.
+  //   BackendComponent::InvalidBit is technically the lowest enum value,
+  //   but it isn't included in the runtime table. So CPUBit = 1, CUDABit = 2,
+  //   etc.
+  uint64_t getBackendIndex() const {
+    return DispatchKeySet((repr_ & full_backend_mask) >> 1).indexOfHighestBit();
+  }
+
+ private:
+  constexpr DispatchKeySet(uint64_t repr) : repr_(repr) {}
+  uint64_t repr_ = 0;
+
+ public:
+  // STL iterator for DispatchKeySet. Iterates through all runtime DispatchKeys
+  // in the set. The iterator is only invalidated by the destruction of the
+  // underlying DispatchKeySet as the iterator stores a pointer to the raw
+  // representation of the DispatchKeySet. Note: When we encounter a per-backend
+  // functionality (e.g. Dense or Sparse), we will iterate through EVERY backend
+  // in the keyset, for that functionality. For example, if the next
+  // functionality key to iterate over is Autograd, and the backend bits in the
+  // keyset correspond to [BackendComponent::CPUBit, BackendComponent::CUDABit],
+  // then the next two keys we return will be DispatchKey::AutogradCPU,
+  // DispatchKey::AutogradCUDA (CPU first because it has lower precedence than
+  // CUDA in DispatchKey.h).
+  class iterator {
+   public:
+    using self_type = iterator;
+    using iterator_category = std::input_iterator_tag;
+    using value_type = DispatchKey;
+    using difference_type = ptrdiff_t;
+    using reference = value_type&;
+    using pointer = value_type*;
+    // final mask value should mask out the entire keyset
+    static const uint8_t end_iter_mask_val =
+        num_backends + num_functionality_keys;
+    // final key value should be the last DispatchKey
+    static const uint8_t end_iter_key_val = num_functionality_keys;
+
+    // current_dispatchkey_idx_ will iterate through all functionality bits.
+    // current_backendcomponent_idx_ will iterate through all backend bits.
+    explicit iterator(
+        const uint64_t* data_ptr,
+        uint8_t next_functionality = num_backends,
+        uint8_t next_backend = 0)
+        : data_ptr_(data_ptr),
+          next_functionality_(next_functionality),
+          next_backend_(next_backend),
+          // These are in an invalid state at construction time, and set by the
+          // first increment call
+          current_dispatchkey_idx_(end_iter_key_val),
+          current_backendcomponent_idx_(end_iter_key_val) {
+      // Go to the first key in the set
+      TORCH_INTERNAL_ASSERT(
+          next_functionality_ >= num_backends,
+          "num_backends=",
+          static_cast<uint32_t>(num_backends),
+          "next_functionality_=",
+          static_cast<uint32_t>(next_functionality_));
+      ++(*this);
+    }
+
+    C10_API self_type& operator++();
+
+    self_type operator++(int) {
+      self_type previous_iterator = *this;
+      ++(*this);
+      return previous_iterator;
+    }
+
+    bool operator==(const self_type& rhs) const {
+      return next_functionality_ == rhs.next_functionality_ &&
+          current_dispatchkey_idx_ == rhs.current_dispatchkey_idx_ &&
+          next_backend_ == rhs.next_backend_ &&
+          current_backendcomponent_idx_ == rhs.current_backendcomponent_idx_;
+    }
+    bool operator!=(const self_type& rhs) const {
+      return next_functionality_ != rhs.next_functionality_ ||
+          current_dispatchkey_idx_ != rhs.current_dispatchkey_idx_ ||
+          next_backend_ != rhs.next_backend_ ||
+          current_backendcomponent_idx_ != rhs.current_backendcomponent_idx_;
+    }
+    DispatchKey operator*() const {
+      auto functionality_key =
+          static_cast<DispatchKey>(current_dispatchkey_idx_);
+      if (isPerBackendFunctionalityKey(functionality_key)) {
+        auto next_key = toRuntimePerBackendFunctionalityKey(
+            functionality_key,
+            static_cast<BackendComponent>(current_backendcomponent_idx_));
+        // We expect all of the Dense, Sparse, Quantized, and Autograd keys to
+        // be ordered the same way with respect to their backends
+        TORCH_INTERNAL_ASSERT(
+            toBackendComponent(next_key) ==
+                static_cast<BackendComponent>(current_backendcomponent_idx_),
+            "Tried to map functionality key ",
+            toString(functionality_key),
+            " and backend bit ",
+            toString(
+                static_cast<BackendComponent>(current_backendcomponent_idx_)),
+            " to a runtime key, but ended up with ",
+            toString(next_key),
+            ". This can happen if the order of the backend dispatch keys in DispatchKey.h isn't consistent.",
+            " Please double check that enum for inconsistencies.");
+        return next_key;
+      } else {
+        return functionality_key;
+      }
+    }
+
+   private:
+    const uint64_t* data_ptr_;
+    uint8_t next_functionality_;
+    uint8_t next_backend_;
+    uint8_t current_dispatchkey_idx_;
+    uint8_t current_backendcomponent_idx_;
+  };
+
+ public:
+  // Returns iterator to the first key in the set. If no keys are in the
+  // set, then will return the end iterator.
+  iterator begin() const {
+    return iterator(&repr_);
+  }
+
+  // We do not need to iterate beyond EndOfFunctionalityKeys so we will treat
+  // this as the end iterator.
+  iterator end() const {
+    return iterator(&repr_, iterator::end_iter_mask_val);
+  }
+};
+
+C10_API std::string toString(DispatchKeySet);
+C10_API std::ostream& operator<<(std::ostream&, DispatchKeySet);
+
+C10_API inline int getDispatchTableIndexForDispatchKey(DispatchKey k) {
+  return DispatchKeySet(k).getDispatchTableIndexForDispatchKeySet();
+}
+
+// Alias key DispatchKey::Autograd maps to
+// (autograd_dispatch_keyset x full_backend_mask)
+// NB: keys in this set also get associated with CompositeImplicitAutograd
+//
+// Note [autograd_dispatch_keyset Does Not Include Backend Bits]
+// We don't want to include any backend bits (BackendComponent::CPUBit, etc)
+// directly in autograd_dispatch_keyset.
+// Why? keysets like autograd_dispatch_keyset are commonly used to remove
+// autograd keys from a DispatchKeySet throughout the code base. However, you
+// are only allowed to remove functionality bits from a keyset, not backend
+// bits. See Note [Removing keys from DispatchKeySet Only Affects Functionality
+// Keys] for details. To be consistent and avoid confusion, we're explicitly
+// setting up autograd_dispatch_keyset to not have any backend bits.
+constexpr DispatchKeySet autograd_dispatch_keyset = DispatchKeySet({
+    DispatchKey::AutogradFunctionality,
+    DispatchKey::AutogradOther,
+    DispatchKey::AutogradNestedTensor,
+});
+
+constexpr DispatchKeySet autocast_dispatch_keyset = DispatchKeySet({
+    DispatchKey::AutocastCPU,
+    DispatchKey::AutocastMPS,
+    DispatchKey::AutocastCUDA,
+    DispatchKey::AutocastXPU,
+    DispatchKey::AutocastIPU,
+    DispatchKey::AutocastHPU,
+    DispatchKey::AutocastXLA,
+    DispatchKey::AutocastPrivateUse1,
+});
+
+// See Note [TLS Initialization]
+constexpr DispatchKeySet default_included_set = DispatchKeySet({
+    DispatchKey::BackendSelect,
+    DispatchKey::ADInplaceOrView,
+});
+
+constexpr DispatchKeySet default_excluded_set = DispatchKeySet({
+    DispatchKey::AutocastCPU,
+    DispatchKey::AutocastMPS,
+    DispatchKey::AutocastCUDA,
+    DispatchKey::AutocastXPU,
+    DispatchKey::AutocastIPU,
+    DispatchKey::AutocastHPU,
+    DispatchKey::AutocastXLA,
+    DispatchKey::AutocastPrivateUse1,
+});
+
+constexpr DispatchKeySet autograd_dispatch_keyset_with_ADInplaceOrView =
+    autograd_dispatch_keyset | DispatchKeySet(DispatchKey::ADInplaceOrView);
+
+constexpr DispatchKeySet python_ks = DispatchKeySet({
+    DispatchKey::Python,
+    DispatchKey::PythonTLSSnapshot,
+});
+
+constexpr DispatchKeySet sparse_ks = DispatchKeySet(DispatchKey::Sparse);
+
+constexpr DispatchKeySet sparse_csr_ks = DispatchKeySet(DispatchKey::SparseCsr);
+
+constexpr DispatchKeySet mkldnn_ks = DispatchKeySet(DispatchKey::MkldnnCPU);
+
+// backend dispatch keys that map to DispatchKey::AutogradOther
+// NB: keys in this set also get associated with CompositeImplicitAutograd
+constexpr DispatchKeySet autogradother_backends =
+    DispatchKeySet(
+        // HIP and VE aren't in this list: they now have their own backend bits
+        // which means that they can now have their own Autograd keys.
+        // Technically, HIP will now redispatch to its own custom AutogradHIP
+        // slot in the runtime table.
+        {DispatchKey::FPGA,
+         DispatchKey::MAIA,
+         DispatchKey::Vulkan,
+         DispatchKey::Metal,
+         DispatchKey::CustomRNGKeyId,
+         DispatchKey::MkldnnCPU,
+         // Sparse and Quantized backends also live here.
+         DispatchKey::Sparse,
+         DispatchKey::SparseCsr,
+         DispatchKey::Quantized})
+    // Including the backend bits because this keyset is used during op
+    // registration, which requires looping over all runtime autogradother
+    // backend keys.
+    | DispatchKeySet(DispatchKeySet::RAW, full_backend_mask);
+
+// The set of dispatch keys that come after autograd
+// n.b. this relies on the fact that AutogradOther is currently the lowest
+// Autograd key
+constexpr DispatchKeySet after_autograd_keyset =
+    DispatchKeySet(DispatchKeySet::FULL_AFTER, c10::DispatchKey::AutogradOther);
+
+// The set of dispatch keys that come after ADInplaceOrView
+constexpr DispatchKeySet after_ADInplaceOrView_keyset = DispatchKeySet(
+    DispatchKeySet::FULL_AFTER,
+    c10::DispatchKey::ADInplaceOrView);
+
+// The set of dispatch keys that come after Functionalize
+constexpr DispatchKeySet after_func_keyset =
+    DispatchKeySet(DispatchKeySet::FULL_AFTER, c10::DispatchKey::Functionalize)
+        .remove(
+            // NOTE: we also need to remove ADInplaceOrView from the keyset when
+            // redispatching after the func kernels. This is because we're not
+            // calling the same op; we originally called an inplace op, and now
+            // we aren't. The original key calculation figured out which keys
+            // were Fallthrough based on the inplace op. That means that it did
+            // not include the ADInPlaceOrView kernel as a fallthrough key.
+            // However, we WANT the ADInPlaceOrView kernel to be ignored now
+            // that we're calling an out-of-place op. Re-invoking
+            // Dispatcher::call would re-run the Fallthrough key calculation and
+            // get us that, But at::redispatch is more performant. We can get
+            // away with it by explicitly removing the key here.
+            c10::DispatchKey::ADInplaceOrView);
+
+constexpr DispatchKeySet backend_bitset_mask =
+    DispatchKeySet(DispatchKeySet::RAW, (1ULL << num_backends) - 1);
+
+constexpr auto inplace_or_view_ks =
+    DispatchKeySet(DispatchKey::ADInplaceOrView);
+constexpr auto autograd_cpu_ks = DispatchKeySet(DispatchKey::AutogradCPU);
+constexpr auto autograd_ipu_ks = DispatchKeySet(DispatchKey::AutogradIPU);
+constexpr auto autograd_xpu_ks = DispatchKeySet(DispatchKey::AutogradXPU);
+constexpr auto autograd_cuda_ks = DispatchKeySet(DispatchKey::AutogradCUDA);
+constexpr auto autograd_xla_ks = DispatchKeySet(DispatchKey::AutogradXLA);
+constexpr auto autograd_lazy_ks = DispatchKeySet(DispatchKey::AutogradLazy);
+constexpr auto autograd_meta_ks = DispatchKeySet(DispatchKey::AutogradMeta);
+constexpr auto autograd_mps_ks = DispatchKeySet(DispatchKey::AutogradMPS);
+constexpr auto autograd_hpu_ks = DispatchKeySet(DispatchKey::AutogradHPU);
+constexpr auto autograd_privateuse1_ks =
+    DispatchKeySet(DispatchKey::AutogradPrivateUse1);
+constexpr auto autograd_privateuse2_ks =
+    DispatchKeySet(DispatchKey::AutogradPrivateUse2);
+constexpr auto autograd_privateuse3_ks =
+    DispatchKeySet(DispatchKey::AutogradPrivateUse3);
+constexpr auto autograd_other_ks = DispatchKeySet(DispatchKey::AutogradOther);
+constexpr auto autograd_nested =
+    DispatchKeySet(DispatchKey::AutogradNestedTensor);
+// keyset corresponding to functorch keys that have their own dedicated
+// TensorImpl subclass.
+constexpr auto functorch_transforms_ks = DispatchKeySet(
+    {DispatchKey::FuncTorchBatched,
+     DispatchKey::FuncTorchVmapMode,
+     DispatchKey::Batched,
+     DispatchKey::VmapMode,
+     DispatchKey::FuncTorchGradWrapper});
+
+constexpr auto functorch_batched_ks =
+    DispatchKeySet({DispatchKey::FuncTorchBatched});
+
+// This keyset has:
+// (1) the functionality bits corresponding to backends (dense, sparse,
+// quantized) (2) all of the backend bits set
+constexpr DispatchKeySet backend_functionality_keys =
+    DispatchKeySet({
+        DispatchKey::Dense,
+        DispatchKey::Quantized,
+        DispatchKey::Sparse,
+        DispatchKey::SparseCsr,
+    }) |
+    DispatchKeySet(DispatchKeySet::RAW, full_backend_mask);
+
+struct OpTableOffsetAndMask {
+  uint16_t offset;
+  uint16_t backend_mask;
+};
+
+static_assert(
+    num_backends <= 16,
+    "Right now we expect the number of backends not to exceed 16. In the (unlikely) event"
+    " that this changes, the size of OpTableOffsetAndMask::backend_mask needs to be increased too.");
+
+// true if t is a backend dispatch key
+C10_API bool isBackendDispatchKey(DispatchKey t);
+
+// Resolve alias dispatch key to DispatchKeySet if applicable
+C10_API DispatchKeySet getRuntimeDispatchKeySet(DispatchKey t);
+
+// Resolve alias dispatch key to DispatchKeySet if applicable,
+// and check if k is a part of that set
+C10_API bool runtimeDispatchKeySetHas(DispatchKey t, DispatchKey k);
+
+// Returns a DispatchKeySet of all backend keys mapped to Autograd dispatch key
+// t, DispatchKeySet is empty if t is not alias of DispatchKey::Autograd.
+C10_API DispatchKeySet getBackendKeySetFromAutograd(DispatchKey t);
+
+// Returns a DispatchKeySet of autograd related keys mapped to backend.
+// for a given backend key, use the associated autograd key.
+// for non-backend keys, use AutogradOther as a default.
+// Note: it's convenient and fast to return a default here rather than (say)
+// returning an std::optional<DispatchKey>, or throwing. But it makes callers
+// responsible for either a) enforcing the invariant that only backend keys
+// be passed as arguments, or b) interpreting our return value carefully.
+inline DispatchKeySet getAutogradRelatedKeySetFromBackend(BackendComponent t) {
+  switch (t) {
+    case BackendComponent::CPUBit:
+      return inplace_or_view_ks | autograd_cpu_ks;
+    case BackendComponent::IPUBit:
+      return inplace_or_view_ks | autograd_ipu_ks;
+    case BackendComponent::XPUBit:
+      return inplace_or_view_ks | autograd_xpu_ks;
+    case BackendComponent::CUDABit:
+      return inplace_or_view_ks | autograd_cuda_ks;
+    case BackendComponent::XLABit:
+      return inplace_or_view_ks | autograd_xla_ks;
+    case BackendComponent::LazyBit:
+      return inplace_or_view_ks | autograd_lazy_ks;
+    case BackendComponent::MetaBit:
+      return inplace_or_view_ks | autograd_meta_ks;
+    case BackendComponent::MPSBit:
+      return inplace_or_view_ks | autograd_mps_ks;
+    case BackendComponent::HPUBit:
+      return inplace_or_view_ks | autograd_hpu_ks;
+    case BackendComponent::PrivateUse1Bit:
+      return inplace_or_view_ks | autograd_privateuse1_ks;
+    case BackendComponent::PrivateUse2Bit:
+      return inplace_or_view_ks | autograd_privateuse2_ks;
+    case BackendComponent::PrivateUse3Bit:
+      return inplace_or_view_ks | autograd_privateuse3_ks;
+    default:
+      return inplace_or_view_ks | autograd_other_ks;
+  }
+}
+
+// Returns a DispatchKeySet of autocast related keys mapped to backend.
+inline DispatchKeySet getAutocastRelatedKeySetFromBackend(BackendComponent t) {
+  constexpr auto autocast_cpu_ks = DispatchKeySet(DispatchKey::AutocastCPU);
+  constexpr auto autocast_xpu_ks = DispatchKeySet(DispatchKey::AutocastXPU);
+  constexpr auto autocast_ipu_ks = DispatchKeySet(DispatchKey::AutocastIPU);
+  constexpr auto autocast_hpu_ks = DispatchKeySet(DispatchKey::AutocastHPU);
+  constexpr auto autocast_cuda_ks = DispatchKeySet(DispatchKey::AutocastCUDA);
+  constexpr auto autocast_xla_ks = DispatchKeySet(DispatchKey::AutocastXLA);
+  constexpr auto autocast_privateuse1_ks =
+      DispatchKeySet(DispatchKey::AutocastPrivateUse1);
+  constexpr auto autocast_mps_ks = DispatchKeySet(DispatchKey::AutocastMPS);
+  switch (t) {
+    case BackendComponent::CPUBit:
+      return autocast_cpu_ks;
+    case BackendComponent::XPUBit:
+      return autocast_xpu_ks;
+    case BackendComponent::IPUBit:
+      return autocast_ipu_ks;
+    case BackendComponent::HPUBit:
+      return autocast_hpu_ks;
+    case BackendComponent::CUDABit:
+      return autocast_cuda_ks;
+    case BackendComponent::XLABit:
+      return autocast_xla_ks;
+    case BackendComponent::PrivateUse1Bit:
+      return autocast_privateuse1_ks;
+    case BackendComponent::MPSBit:
+      return autocast_mps_ks;
+    default:
+      return DispatchKeySet();
+  }
+}
+
+// returns the "backend" DispatchKey of highest priority in the set.
+// This is basically like highestBackendKey(), except that we have some
+// "functionality" bits that correspond to backends (Sparse, Quantized)
+inline DispatchKey highestPriorityBackendTypeId(DispatchKeySet ks) {
+  return (ks & backend_functionality_keys).highestPriorityTypeId();
+}
+
+// This API exists because we have a use case for checking
+// getRuntimeDispatchKeySet(alias).has(DispatchKey::Undefined)
+// in OperatorEntry.cpp but we disallow it in has() API.
+C10_API bool isIncludedInAlias(DispatchKey k, DispatchKey alias);
+
+// Historically, every tensor only had a single DispatchKey, and it was always
+// something like CPU, and there wasn't any of this business where TLS
+// could cause the DispatchKey of a tensor to change.  But we still have some
+// legacy code that is still using DispatchKey for things like instanceof
+// checks; if at all possible, refactor the code to stop using DispatchKey in
+// those cases.
+inline DispatchKey legacyExtractDispatchKey(DispatchKeySet s) {
+  // NB: If you add any extra keys that can be stored in TensorImpl on
+  // top of existing "backend" keys like CPU/CUDA, you need to add it
+  // here.  At the moment, autograd keys and ADInplaceOrView key need this
+  // treatment;
+  return (s - autograd_dispatch_keyset_with_ADInplaceOrView -
+          autocast_dispatch_keyset -
+          DispatchKeySet(
+              {DispatchKey::Functionalize,
+               DispatchKey::PythonTLSSnapshot,
+               DispatchKey::FuncTorchGradWrapper,
+               DispatchKey::FuncTorchVmapMode,
+               DispatchKey::FuncTorchBatched,
+               DispatchKey::Python}))
+      .highestPriorityTypeId();
+}
+
+template <class T>
+using is_not_DispatchKeySet = std::negation<std::is_same<DispatchKeySet, T>>;
+
+// Given a function type, constructs a function_traits type that drops the first
+// parameter type if the first parameter is of type DispatchKeySet. NB:
+// DispatchKeySet is currently explicitly hidden from JIT (mainly to avoid
+// pushing unnecessary arguments on the stack - see Note [ Plumbing Keys Through
+// the Dispatcher] for details). If at any point in the future we need to expose
+// this type to JIT, revisit the usage of this type alias.
+template <class FuncType>
+using remove_DispatchKeySet_arg_from_func = guts::make_function_traits_t<
+    typename guts::infer_function_traits_t<FuncType>::return_type,
+    typename std::conditional_t<
+        std::is_same_v<
+            DispatchKeySet,
+            typename guts::typelist::head_with_default_t<
+                void,
+                typename guts::infer_function_traits_t<
+                    FuncType>::parameter_types>>,
+        guts::typelist::drop_if_nonempty_t<
+            typename guts::infer_function_traits_t<FuncType>::parameter_types,
+            1>,
+        typename guts::infer_function_traits_t<FuncType>::parameter_types>>;
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/Event.h

@@ -0,0 +1,137 @@
+#pragma once
+
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/core/Stream.h>
+#include <c10/core/impl/DeviceGuardImplInterface.h>
+#include <c10/core/impl/InlineEvent.h>
+#include <c10/core/impl/VirtualGuardImpl.h>
+
+namespace c10 {
+
+/**
+ * A backend-generic movable, not copyable, not thread-safe event.
+ *
+ * The design of this event follows that of CUDA and HIP events. These events
+ * are recorded and waited on by streams and can be rerecorded to,
+ * each rerecording essentially creating a new version of the event.
+ * For example, if (in CPU time), stream X is asked to record E,
+ * stream Y waits on E, and stream X is asked to record E again, then Y will
+ * wait for X to finish the first call to record and not the second, because
+ * it's waiting on the first version of event E, not the second.
+ * Querying an event only returns the status of its most recent version.
+ *
+ * Backend-generic events are implemented by this class and
+ * impl::InlineEvent. In addition to these events there are also
+ * some backend-specific events, like ATen's CUDAEvent. Each of these
+ * classes has its own use.
+ *
+ * impl::InlineEvent<...> or a backend-specific event should be
+ * preferred when the backend is known at compile time and known to
+ * be compiled. Backend-specific events may have additional functionality.
+ *
+ * This Event should be used if a particular backend may not be available,
+ * or the backend required is not known at compile time.
+ *
+ * These generic events are built on top of DeviceGuardImpls, analogous
+ * to DeviceGuard and InlineDeviceGuard. The name "DeviceGuardImpls,"
+ * is no longer entirely accurate, as these classes implement the
+ * backend-specific logic for a generic backend interface.
+ *
+ * See DeviceGuardImplInterface.h for a list of all supported flags.
+ */
+
+struct Event final {
+  // Constructors
+  Event() = delete;
+  Event(
+      const DeviceType _device_type,
+      const EventFlag _flag = EventFlag::PYTORCH_DEFAULT)
+      : impl_{_device_type, _flag} {}
+
+  // Copy constructor and copy assignment operator (deleted)
+  Event(const Event&) = delete;
+  Event& operator=(const Event&) = delete;
+
+  // Move constructor and move assignment operator
+  Event(Event&&) noexcept = default;
+  Event& operator=(Event&&) noexcept = default;
+
+  // Destructor
+  ~Event() = default;
+
+  // Getters
+  Device device() const noexcept {
+    return Device(device_type(), device_index());
+  }
+  DeviceType device_type() const noexcept {
+    return impl_.device_type();
+  }
+  DeviceIndex device_index() const noexcept {
+    return impl_.device_index();
+  }
+  EventFlag flag() const noexcept {
+    return impl_.flag();
+  }
+  bool was_marked_for_recording() const noexcept {
+    return impl_.was_marked_for_recording();
+  }
+
+  /**
+   * Calls record() if and only if record() has never been called for this
+   * event. Note: because Event is not thread-safe recordOnce() may call
+   * record() multiple times if called from multiple threads.
+   */
+  void recordOnce(const Stream& stream) {
+    impl_.recordOnce(stream);
+  }
+
+  /**
+   * Increments the event's version and enqueues a job with this version
+   * in the stream's work queue. When the stream process that job
+   * it notifies all streams waiting on / blocked by that version of the
+   * event to continue and marks that version as recorded.
+   * */
+  void record(const Stream& stream) {
+    impl_.record(stream);
+  }
+
+  /**
+   * Does nothing if the event has not been scheduled to be recorded.
+   * If the event was previously enqueued to be recorded, a command
+   * to wait for the version of the event that exists at the time of this call
+   * is inserted in the stream's work queue.
+   * When the stream reaches this command it will stop processing
+   * additional commands until that version of the event is marked as recorded.
+   */
+  void block(const Stream& stream) const {
+    impl_.block(stream);
+  }
+
+  /**
+   * Returns true if (and only if)
+   *  (1) the event has never been scheduled to be recorded
+   *  (2) the current version is marked as recorded.
+   * Returns false otherwise.
+   */
+  bool query() const {
+    return impl_.query();
+  }
+
+  double elapsedTime(const Event& event) const {
+    return impl_.elapsedTime(event.impl_);
+  }
+
+  void* eventId() const {
+    return impl_.eventId();
+  }
+
+  void synchronize() const {
+    return impl_.synchronize();
+  }
+
+ private:
+  impl::InlineEvent<impl::VirtualGuardImpl> impl_;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/GeneratorImpl.h

@@ -0,0 +1,110 @@
+#pragma once
+
+#include <cstdint>
+#include <mutex>
+
+#include <c10/core/Device.h>
+#include <c10/core/DispatchKeySet.h>
+#include <c10/core/TensorImpl.h>
+#include <c10/macros/Export.h>
+#include <c10/util/intrusive_ptr.h>
+#include <c10/util/python_stub.h>
+
+/**
+ * Note [Generator]
+ * ~~~~~~~~~~~~~~~~
+ * A Pseudo Random Number Generator (PRNG) is an engine that uses an algorithm
+ * to generate a seemingly random sequence of numbers, that may be later be used
+ * in creating a random distribution. Such an engine almost always maintains a
+ * state and requires a seed to start off the creation of random numbers. Often
+ * times, users have found it beneficial to be able to explicitly create,
+ * retain, and destroy PRNG states and also be able to have control over the
+ * seed value.
+ *
+ * A Generator in ATen gives users the ability to read, write and modify a PRNG
+ * engine. For instance, it does so by letting users seed a PRNG engine, fork
+ * the state of the engine, etc.
+ *
+ * By default, there is one generator per device, and a device's generator is
+ * lazily created. A user can use the torch.Generator() api to create their own
+ * generator. Currently torch.Generator() can only create a CPUGeneratorImpl.
+ */
+
+/**
+ * Note [Acquire lock when using random generators]
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * Generator and its derived classes are NOT thread-safe. Please note that most
+ * of the places where we have inserted locking for generators are historically
+ * based, and we haven't actually checked that everything is truly thread safe
+ * (and it probably isn't). Please use the public mutex_ when using any methods
+ * from these classes, except for the read-only methods. You can learn about the
+ * usage by looking into the unittests (aten/src/ATen/cpu_generator_test.cpp)
+ * and other places where we have used lock_guard.
+ *
+ * TODO: Look into changing the threading semantics of Generators in ATen (e.g.,
+ * making them non-thread safe and instead making the generator state
+ * splittable, to accommodate forks into other threads).
+ */
+
+namespace c10 {
+
+// The default seed is selected to be a large number
+// with good distribution of 0s and 1s in bit representation
+constexpr uint64_t default_rng_seed_val = 67280421310721;
+
+struct C10_API GeneratorImpl : public c10::intrusive_ptr_target {
+  // Constructors
+  GeneratorImpl(Device device_in, DispatchKeySet key_set);
+
+  // Delete all copy and move assignment in favor of clone()
+  // method
+  GeneratorImpl(const GeneratorImpl& other) = delete;
+  GeneratorImpl(GeneratorImpl&& other) = delete;
+  GeneratorImpl& operator=(const GeneratorImpl& other) = delete;
+
+  ~GeneratorImpl() override = default;
+  c10::intrusive_ptr<GeneratorImpl> clone() const;
+
+  // Common methods for all generators
+  virtual void set_current_seed(uint64_t seed) = 0;
+  virtual void set_offset(uint64_t offset) = 0;
+  virtual uint64_t get_offset() const = 0;
+  virtual uint64_t current_seed() const = 0;
+  virtual uint64_t seed() = 0;
+  virtual void set_state(const c10::TensorImpl& new_state) = 0;
+  virtual c10::intrusive_ptr<c10::TensorImpl> get_state() const = 0;
+  virtual void graphsafe_set_state(
+      const c10::intrusive_ptr<c10::GeneratorImpl>& new_state);
+  virtual c10::intrusive_ptr<c10::GeneratorImpl> graphsafe_get_state() const;
+  Device device() const;
+
+  // See Note [Acquire lock when using random generators]
+  std::mutex mutex_;
+
+  DispatchKeySet key_set() const {
+    return key_set_;
+  }
+
+  inline void set_pyobj(PyObject* pyobj) noexcept {
+    pyobj_ = pyobj;
+  }
+
+  inline PyObject* pyobj() const noexcept {
+    return pyobj_;
+  }
+
+ protected:
+  Device device_;
+  DispatchKeySet key_set_;
+  PyObject* pyobj_ = nullptr;
+
+  virtual GeneratorImpl* clone_impl() const = 0;
+};
+
+namespace detail {
+
+C10_API uint64_t getNonDeterministicRandom(bool is_cuda = false);
+
+} // namespace detail
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/GradMode.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <c10/core/AutogradState.h>
+#include <c10/macros/Export.h>
+
+namespace c10 {
+
+struct C10_API GradMode {
+  static bool is_enabled();
+  static void set_enabled(bool enabled);
+};
+
+// A RAII, thread local (!) guard that enables or disables grad mode upon
+// construction, and sets it back to the original value upon destruction.
+struct C10_API AutoGradMode {
+  AutoGradMode(bool enabled) : prev_mode(GradMode::is_enabled()) {
+    GradMode::set_enabled(enabled);
+  }
+  ~AutoGradMode() {
+    GradMode::set_enabled(prev_mode);
+  }
+  bool prev_mode;
+};
+
+// A RAII, thread local (!) guard that stops future operations from building
+// gradients.
+struct C10_API NoGradGuard : public AutoGradMode {
+  NoGradGuard() : AutoGradMode(/*enabled=*/false) {}
+};
+
+// A RAII, thread local (!) guard that enables or disables forward grad mode
+// upon construction, and sets it back to the original value upon destruction.
+struct C10_API AutoFwGradMode {
+  AutoFwGradMode(bool enabled)
+      : prev_mode(AutogradState::get_tls_state().get_fw_grad_mode()) {
+    AutogradState::get_tls_state().set_fw_grad_mode(enabled);
+  }
+  ~AutoFwGradMode() {
+    AutogradState::get_tls_state().set_fw_grad_mode(prev_mode);
+  }
+  bool prev_mode;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/InferenceMode.h

@@ -0,0 +1,86 @@
+#pragma once
+
+#include <c10/core/AutogradState.h>
+#include <c10/core/DispatchKey.h>
+#include <c10/core/DispatchKeySet.h>
+#include <c10/core/impl/LocalDispatchKeySet.h>
+#include <c10/macros/Export.h>
+
+namespace c10 {
+
+// A RAII, thread local (!) guard that enables or disables inference mode upon
+// construction, and sets it back to the original value upon destruction.
+struct C10_API InferenceMode {
+  // Note [Expected TLS state in InferenceMode]:
+  //   InferenceMode: ADInplaceOrView not in
+  //   raw_local_dispatch_key_set.included(),
+  //                  Autograd in raw_local_dispatch_key_set.excluded()
+  //                  GradMode is disabled.
+  //   NormalMode: ADInplaceOrView in raw_local_dispatch_key_set.included(),
+  //               Autograd not in raw_local_dispatch_key_set.excluded()
+  //               GradMode is enabled by default unless toggled manually
+  //               through other APIs, e.g. NoGradGuard.
+  //
+  // Invariant:
+  // - ADInplaceOrView is never in the excluded set
+  // - Autograd is never in the included set
+  // - Setting InferenceMode will set GradMode accordingly, but not vice versa.
+  //
+  //  1. Why do we put ADInplaceOrView in included set outside InferenceMode?
+  //
+  //     Inplace update to inference tensor outside InferenceMode is not
+  //     allowed. See Note [Inplace update inference tensor] for more details.
+  //     Without going through ADInplaceOrView kernel, we cannot throw error
+  //     for `inference_tensor.add_(1)` case.
+  //
+  // 2. Why not put ADInplaceOrView in the excluded set inside InferenceMode?
+  //
+  //    For example:
+  //    torch::Tensor a = torch::ones({1, 2, 3}).set_requires_grad(true);
+  //    torch::Tensor k = a + 2;
+  //    {
+  //      c10::InferenceMode guard(true);
+  //      k.add_(2);
+  //    }
+  //    `k.add_(2)` still need to go through ADInplaceOrView kernel so that it's
+  //    prepared for future autograd.
+  //
+  // 3. Why does setting InferenceMode also set GradMode?
+  //
+  //    This is required since InferenceMode is a faster and more restrictive
+  //    version of NoGradGuard. All runtime checks using GradMode::is_enabled()
+  //    are applicable to InferenceMode as well, e.g.
+  //    `tensorTypeInCurrentExecutionContext` in interpreter.cpp.
+  InferenceMode(bool enabled = true)
+      : prev_mode(AutogradState::get_tls_state()),
+        prev_keyset(c10::impl::tls_local_dispatch_key_set()) {
+    // Enabling inference mode means disabling grad modes
+    // And disabling inference mode means enabling grad modes
+    AutogradState::set_tls_state(AutogradState(
+        /* grad_mode */ !enabled,
+        /* inference_mode */ enabled,
+        /* fw_grad_mode */ !enabled,
+        /* multithreading_enabled*/ !enabled));
+    DispatchKeySet included = enabled
+        ? prev_keyset.included_.remove(c10::DispatchKey::ADInplaceOrView)
+        : prev_keyset.included_.add(c10::DispatchKey::ADInplaceOrView);
+    DispatchKeySet excluded = enabled
+        ? (prev_keyset.excluded_ | c10::autograd_dispatch_keyset)
+        : (prev_keyset.excluded_ - c10::autograd_dispatch_keyset);
+    c10::impl::PODLocalDispatchKeySet cur_keyset{};
+    cur_keyset.set_included(included);
+    cur_keyset.set_excluded(excluded);
+    c10::impl::_force_tls_local_dispatch_key_set(cur_keyset);
+  }
+
+  ~InferenceMode() {
+    AutogradState::set_tls_state(prev_mode);
+    c10::impl::_force_tls_local_dispatch_key_set(prev_keyset);
+  }
+  static bool is_enabled();
+
+ private:
+  AutogradState prev_mode;
+  c10::impl::LocalDispatchKeySet prev_keyset;
+};
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/Layout.h

@@ -0,0 +1,78 @@
+#pragma once
+
+#include <c10/core/Backend.h>
+#include <c10/util/Exception.h>
+
+#include <cstdint>
+#include <ostream>
+
+namespace c10 {
+enum class Layout : int8_t {
+  Strided,
+  Sparse,
+  SparseCsr,
+  Mkldnn,
+  SparseCsc,
+  SparseBsr,
+  SparseBsc,
+  Jagged,
+  NumOptions
+};
+
+constexpr auto kStrided = Layout::Strided;
+constexpr auto kSparse = Layout::Sparse;
+constexpr auto kSparseCsr = Layout::SparseCsr;
+constexpr auto kMkldnn = Layout::Mkldnn;
+constexpr auto kSparseCsc = Layout::SparseCsc;
+constexpr auto kSparseBsr = Layout::SparseBsr;
+constexpr auto kSparseBsc = Layout::SparseBsc;
+constexpr auto kJagged = Layout::Jagged;
+
+inline Layout layout_from_backend(Backend backend) {
+  switch (backend) {
+    case Backend::SparseCPU:
+    case Backend::SparseCUDA:
+    case Backend::SparseHIP:
+    case Backend::SparseVE:
+    case Backend::SparseXPU:
+    case Backend::SparsePrivateUse1:
+      return Layout::Sparse;
+    case Backend::MkldnnCPU:
+      return Layout::Mkldnn;
+    case Backend::SparseCsrCPU:
+    case Backend::SparseCsrCUDA:
+    case Backend::SparseCsrHIP:
+    case Backend::SparseCsrVE:
+    case Backend::SparseCsrXPU:
+      TORCH_CHECK(
+          false,
+          "Cannot map Backend SparseCsr(CPU|CUDA|HIP|VE|XPU) to a unique layout.");
+    default:
+      return Layout::Strided;
+  }
+}
+
+inline std::ostream& operator<<(std::ostream& stream, at::Layout layout) {
+  switch (layout) {
+    case at::kStrided:
+      return stream << "Strided";
+    case at::kSparse:
+      return stream << "Sparse";
+    case at::kSparseCsr:
+      return stream << "SparseCsr";
+    case at::kSparseCsc:
+      return stream << "SparseCsc";
+    case at::kSparseBsr:
+      return stream << "SparseBsr";
+    case at::kSparseBsc:
+      return stream << "SparseBsc";
+    case at::kMkldnn:
+      return stream << "Mkldnn";
+    case at::kJagged:
+      return stream << "Jagged";
+    default:
+      TORCH_CHECK(false, "Unknown layout");
+  }
+}
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/PyHandleCache.h

@@ -0,0 +1,76 @@
+#pragma once
+
+#include <c10/core/impl/PyInterpreter.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Exception.h>
+#include <c10/util/python_stub.h>
+
+#include <atomic>
+
+namespace c10 {
+
+// A PyHandleCache represents a cached pointer from a C++ object to
+// a Python object that represents that object analogously in Python.
+// Upon a cache hit, the relevant object can be retrieved after a test
+// and then a memory load.  Two conditions must hold to be able to use this
+// class:
+//
+//  - This must truly be a cache; e.g., the caller must be able to produce
+//    the object some other way if the cache hit misses.
+//
+//  - This must truly be a handle; e.g., the Python object referenced by
+//    this class must have static lifetime.  This means we don't have to
+//    maintain strong ownership or deallocate the object when the C++ object
+//    dies.  Static lifetime is a good idea in conjunction with the cache,
+//    since if you are producing a fresh object on miss you won't be
+//    maintaining object identity.  If you need bidirectional ownership,
+//    you will want to factor out the pattern in TensorImpl with
+//    resurrection.
+//
+// This cache is expected to not improve perf under torchdeploy, as one
+// interpreter will fill up the cache, and all the interpreters will be
+// unable to use the slot.  A potential improvement is to have multiple
+// slots (one per interpreter), which will work in deployment scenarios
+// where there a stable, fixed number of interpreters.  You can also store
+// the relevant state in the Python library, rather than in the non-Python
+// library (although in many cases, this is not convenient, as there may
+// not be a way to conveniently index based on the object.)
+class PyHandleCache {
+ public:
+  PyHandleCache() : pyinterpreter_(nullptr) {}
+
+  // Attempt to fetch the pointer from the cache, if the PyInterpreter
+  // matches.  If it doesn't exist, or the cache entry is not valid,
+  // use slow_accessor to get the real pointer value and return that
+  // (possibly writing it to the cache, if the cache entry is
+  // available.)
+  template <typename F>
+  PyObject* ptr_or(impl::PyInterpreter* self_interpreter, F slow_accessor)
+      const {
+    // Note [Memory ordering on Python interpreter tag]
+    impl::PyInterpreter* interpreter =
+        pyinterpreter_.load(std::memory_order_acquire);
+    if (C10_LIKELY(interpreter == self_interpreter)) {
+      return data_;
+    } else if (interpreter == nullptr) {
+      auto* r = slow_accessor();
+      impl::PyInterpreter* expected = nullptr;
+      // attempt to claim this cache entry with the specified interpreter tag
+      if (pyinterpreter_.compare_exchange_strong(
+              expected, self_interpreter, std::memory_order_acq_rel)) {
+        data_ = r;
+      }
+      // This shouldn't be possible, as you should be GIL protected
+      TORCH_INTERNAL_ASSERT(expected != self_interpreter);
+      return r;
+    } else {
+      return slow_accessor();
+    }
+  }
+
+ private:
+  mutable std::atomic<impl::PyInterpreter*> pyinterpreter_;
+  mutable PyObject* data_{nullptr};
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/QEngine.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <c10/util/Exception.h>
+#include <cstdint>
+#include <string>
+
+namespace c10 {
+
+/**
+ * QEngine is an enum that is used to select the engine to run quantized ops.
+ * Keep this enum in sync with get_qengine_id() in
+ * torch/backends/quantized/__init__.py
+ */
+enum class QEngine : uint8_t {
+  NoQEngine = 0,
+  FBGEMM = 1,
+  QNNPACK = 2,
+  ONEDNN = 3,
+  X86 = 4,
+};
+
+constexpr auto kNoQEngine = QEngine::NoQEngine;
+constexpr auto kFBGEMM = QEngine::FBGEMM;
+constexpr auto kQNNPACK = QEngine::QNNPACK;
+constexpr auto kONEDNN = QEngine::ONEDNN;
+constexpr auto kX86 = QEngine::X86;
+
+inline std::string toString(QEngine qengine) {
+  switch (qengine) {
+    case kNoQEngine:
+      return "NoQEngine";
+    case kFBGEMM:
+      return "FBGEMM";
+    case kQNNPACK:
+      return "QNNPACK";
+    case kONEDNN:
+      return "ONEDNN";
+    case kX86:
+      return "X86";
+    default:
+      TORCH_CHECK(
+          false, "Unrecognized Quantized Engine: ", static_cast<int>(qengine));
+  }
+}
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/RefcountedDeleter.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <c10/core/Storage.h>
+#include <c10/macros/Export.h>
+#include <c10/util/UniqueVoidPtr.h>
+
+#include <atomic>
+#include <memory>
+
+namespace c10 {
+
+// A RefcountedDeleterContext object is used as the `ctx` argument for DataPtr
+// to implement a shared DataPtr. Normally, a DataPtr is unique, but we use
+// this custom context and the `refcounted_deleter` function below to make the
+// DataPtr act like a non-unique DataPtr. This context object holds onto an
+// inner context and deleter function which handle the actual deletion of the
+// data when the refcount reaches 0.
+//
+// This shared DataPtr feature is only used when storages are shared between
+// multiple Python interpreters in MultiPy. Before storages had PyObject
+// preservation, interpreters could just share the same StorageImpl instance.
+// But now a StorageImpl can only be associated with one interpreter in order
+// to properly manage a zombie PyObject. So we share storages across Python
+// interpreters by creating a different StorageImpl instance for each one, but
+// they all point to the same data.
+struct C10_API RefcountedDeleterContext {
+  RefcountedDeleterContext(void* other_ctx, c10::DeleterFnPtr other_deleter)
+      : other_ctx(other_ctx, other_deleter), refcount(1) {}
+
+  std::unique_ptr<void, c10::DeleterFnPtr> other_ctx;
+  std::atomic_int refcount;
+};
+
+// `refcounted_deleter` is used as the `ctx_deleter` for DataPtr to implement
+// a shared DataPtr.
+//
+// Warning: This should only be called on a pointer to
+// a RefcountedDeleterContext that was allocated on the heap with `new`,
+// because when the refcount reaches 0, the context is deleted with `delete`
+C10_API void refcounted_deleter(void* ctx_);
+
+// If the storage's DataPtr does not use `refcounted_deleter`, replace it with
+// a DataPtr that does, so it can be shared between multiple StorageImpls
+C10_API void maybeApplyRefcountedDeleter(const c10::Storage& storage);
+
+// Create a new StorageImpl that points to the same data. If the original
+// StorageImpl's DataPtr does not use `refcounted_deleter`, it will be replaced
+// with one that does
+C10_API c10::Storage newStorageImplFromRefcountedDataPtr(
+    const c10::Storage& storage);
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/SafePyObject.h

@@ -0,0 +1,118 @@
+#pragma once
+
+#include <c10/core/impl/PyInterpreter.h>
+#include <c10/macros/Export.h>
+#include <c10/util/python_stub.h>
+#include <utility>
+
+namespace c10 {
+
+// This is an safe owning holder for a PyObject, akin to pybind11's
+// py::object, with two major differences:
+//
+//  - It is in c10/core; i.e., you can use this type in contexts where
+//    you do not have a libpython dependency
+//
+//  - It is multi-interpreter safe (ala torchdeploy); when you fetch
+//    the underlying PyObject* you are required to specify what the current
+//    interpreter context is and we will check that you match it.
+//
+// It is INVALID to store a reference to a Tensor object in this way;
+// you should just use TensorImpl directly in that case!
+struct C10_API SafePyObject {
+  // Steals a reference to data
+  SafePyObject(PyObject* data, c10::impl::PyInterpreter* pyinterpreter)
+      : data_(data), pyinterpreter_(pyinterpreter) {}
+  SafePyObject(SafePyObject&& other) noexcept
+      : data_(std::exchange(other.data_, nullptr)),
+        pyinterpreter_(other.pyinterpreter_) {}
+  // For now it's not used, so we just disallow it.
+  SafePyObject& operator=(SafePyObject&&) = delete;
+
+  SafePyObject(SafePyObject const& other)
+      : data_(other.data_), pyinterpreter_(other.pyinterpreter_) {
+    if (data_ != nullptr) {
+      (*pyinterpreter_)->incref(data_);
+    }
+  }
+
+  SafePyObject& operator=(SafePyObject const& other) {
+    if (this == &other) {
+      return *this; // Handle self-assignment
+    }
+    if (other.data_ != nullptr) {
+      (*other.pyinterpreter_)->incref(other.data_);
+    }
+    if (data_ != nullptr) {
+      (*pyinterpreter_)->decref(data_, /*has_pyobj_slot*/ false);
+    }
+    data_ = other.data_;
+    pyinterpreter_ = other.pyinterpreter_;
+    return *this;
+  }
+
+  ~SafePyObject() {
+    if (data_ != nullptr) {
+      (*pyinterpreter_)->decref(data_, /*has_pyobj_slot*/ false);
+    }
+  }
+
+  c10::impl::PyInterpreter& pyinterpreter() const {
+    return *pyinterpreter_;
+  }
+  PyObject* ptr(const c10::impl::PyInterpreter*) const;
+
+  // stop tracking the current object, and return it
+  PyObject* release() {
+    auto rv = data_;
+    data_ = nullptr;
+    return rv;
+  }
+
+ private:
+  PyObject* data_;
+  c10::impl::PyInterpreter* pyinterpreter_;
+};
+
+// A newtype wrapper around SafePyObject for type safety when a python object
+// represents a specific type. Note that `T` is only used as a tag and isn't
+// actually used for any true purpose.
+template <typename T>
+struct SafePyObjectT : private SafePyObject {
+  SafePyObjectT(PyObject* data, c10::impl::PyInterpreter* pyinterpreter)
+      : SafePyObject(data, pyinterpreter) {}
+  SafePyObjectT(SafePyObjectT&& other) noexcept : SafePyObject(other) {}
+  SafePyObjectT(SafePyObjectT const&) = delete;
+  SafePyObjectT& operator=(SafePyObjectT const&) = delete;
+
+  using SafePyObject::ptr;
+  using SafePyObject::pyinterpreter;
+  using SafePyObject::release;
+};
+
+// Like SafePyObject, but non-owning.  Good for references to global PyObjects
+// that will be leaked on interpreter exit.  You get a copy constructor/assign
+// this way.
+struct C10_API SafePyHandle {
+  SafePyHandle() : data_(nullptr), pyinterpreter_(nullptr) {}
+  SafePyHandle(PyObject* data, c10::impl::PyInterpreter* pyinterpreter)
+      : data_(data), pyinterpreter_(pyinterpreter) {}
+
+  c10::impl::PyInterpreter& pyinterpreter() const {
+    return *pyinterpreter_;
+  }
+  PyObject* ptr(const c10::impl::PyInterpreter*) const;
+  void reset() {
+    data_ = nullptr;
+    pyinterpreter_ = nullptr;
+  }
+  operator bool() {
+    return data_;
+  }
+
+ private:
+  PyObject* data_;
+  c10::impl::PyInterpreter* pyinterpreter_;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/Scalar.h

@@ -0,0 +1,467 @@
+#pragma once
+
+#include <cstdint>
+#include <stdexcept>
+#include <type_traits>
+#include <utility>
+
+#include <c10/core/OptionalRef.h>
+#include <c10/core/ScalarType.h>
+#include <c10/core/SymBool.h>
+#include <c10/core/SymFloat.h>
+#include <c10/core/SymInt.h>
+#include <c10/core/SymNodeImpl.h>
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Deprecated.h>
+#include <c10/util/Exception.h>
+#include <c10/util/Half.h>
+#include <c10/util/TypeCast.h>
+#include <c10/util/complex.h>
+#include <c10/util/intrusive_ptr.h>
+
+namespace c10 {
+
+/**
+ * Scalar represents a 0-dimensional tensor which contains a single element.
+ * Unlike a tensor, numeric literals (in C++) are implicitly convertible to
+ * Scalar (which is why, for example, we provide both add(Tensor) and
+ * add(Scalar) overloads for many operations). It may also be used in
+ * circumstances where you statically know a tensor is 0-dim and single size,
+ * but don't know its type.
+ */
+class C10_API Scalar {
+ public:
+  Scalar() : Scalar(int64_t(0)) {}
+
+  void destroy() {
+    if (Tag::HAS_si == tag || Tag::HAS_sd == tag || Tag::HAS_sb == tag) {
+      raw::intrusive_ptr::decref(v.p);
+      v.p = nullptr;
+    }
+  }
+
+  ~Scalar() {
+    destroy();
+  }
+
+#define DEFINE_IMPLICIT_CTOR(type, name) \
+  Scalar(type vv) : Scalar(vv, true) {}
+
+  AT_FORALL_SCALAR_TYPES_AND7(
+      Half,
+      BFloat16,
+      Float8_e5m2,
+      Float8_e4m3fn,
+      Float8_e5m2fnuz,
+      Float8_e4m3fnuz,
+      ComplexHalf,
+      DEFINE_IMPLICIT_CTOR)
+  AT_FORALL_COMPLEX_TYPES(DEFINE_IMPLICIT_CTOR)
+
+  // Helper constructors to allow Scalar creation from long and long long types
+  // As std::is_same_v<long, long long> is false(except Android), one needs to
+  // provide a constructor from either long or long long in addition to one from
+  // int64_t
+#if defined(__APPLE__) || defined(__MACOSX)
+  static_assert(
+      std::is_same_v<long long, int64_t>,
+      "int64_t is the same as long long on MacOS");
+  Scalar(long vv) : Scalar(vv, true) {}
+#endif
+#if defined(_MSC_VER)
+  static_assert(
+      std::is_same_v<long long, int64_t>,
+      "int64_t is the same as long long on Windows");
+  Scalar(long vv) : Scalar(vv, true) {}
+#endif
+#if defined(__linux__) && !defined(__ANDROID__)
+  static_assert(
+      std::is_same_v<long, int64_t>,
+      "int64_t is the same as long on Linux");
+  Scalar(long long vv) : Scalar(vv, true) {}
+#endif
+
+  Scalar(uint16_t vv) : Scalar(vv, true) {}
+  Scalar(uint32_t vv) : Scalar(vv, true) {}
+  Scalar(uint64_t vv) {
+    if (vv > static_cast<uint64_t>(INT64_MAX)) {
+      tag = Tag::HAS_u;
+      v.u = vv;
+    } else {
+      tag = Tag::HAS_i;
+      // NB: no need to use convert, we've already tested convertibility
+      v.i = static_cast<int64_t>(vv);
+    }
+  }
+
+#undef DEFINE_IMPLICIT_CTOR
+
+  // Value* is both implicitly convertible to SymbolicVariable and bool which
+  // causes ambiguity error. Specialized constructor for bool resolves this
+  // problem.
+  template <
+      typename T,
+      typename std::enable_if_t<std::is_same_v<T, bool>, bool>* = nullptr>
+  Scalar(T vv) : tag(Tag::HAS_b) {
+    v.i = convert<int64_t, bool>(vv);
+  }
+
+  template <
+      typename T,
+      typename std::enable_if_t<std::is_same_v<T, c10::SymBool>, bool>* =
+          nullptr>
+  Scalar(T vv) : tag(Tag::HAS_sb) {
+    v.i = convert<int64_t, c10::SymBool>(vv);
+  }
+
+#define DEFINE_ACCESSOR(type, name)                                   \
+  type to##name() const {                                             \
+    if (Tag::HAS_d == tag) {                                          \
+      return checked_convert<type, double>(v.d, #type);               \
+    } else if (Tag::HAS_z == tag) {                                   \
+      return checked_convert<type, c10::complex<double>>(v.z, #type); \
+    }                                                                 \
+    if (Tag::HAS_b == tag) {                                          \
+      return checked_convert<type, bool>(v.i, #type);                 \
+    } else if (Tag::HAS_i == tag) {                                   \
+      return checked_convert<type, int64_t>(v.i, #type);              \
+    } else if (Tag::HAS_u == tag) {                                   \
+      return checked_convert<type, uint64_t>(v.u, #type);             \
+    } else if (Tag::HAS_si == tag) {                                  \
+      return checked_convert<type, int64_t>(                          \
+          toSymInt().guard_int(__FILE__, __LINE__), #type);           \
+    } else if (Tag::HAS_sd == tag) {                                  \
+      return checked_convert<type, int64_t>(                          \
+          toSymFloat().guard_float(__FILE__, __LINE__), #type);       \
+    } else if (Tag::HAS_sb == tag) {                                  \
+      return checked_convert<type, int64_t>(                          \
+          toSymBool().guard_bool(__FILE__, __LINE__), #type);         \
+    }                                                                 \
+    TORCH_CHECK(false)                                                \
+  }
+
+  // TODO: Support ComplexHalf accessor
+  AT_FORALL_SCALAR_TYPES_WITH_COMPLEX(DEFINE_ACCESSOR)
+  DEFINE_ACCESSOR(uint16_t, UInt16)
+  DEFINE_ACCESSOR(uint32_t, UInt32)
+  DEFINE_ACCESSOR(uint64_t, UInt64)
+
+#undef DEFINE_ACCESSOR
+
+  SymInt toSymInt() const {
+    if (Tag::HAS_si == tag) {
+      return c10::SymInt(intrusive_ptr<SymNodeImpl>::reclaim_copy(
+          static_cast<SymNodeImpl*>(v.p)));
+    } else {
+      return toLong();
+    }
+  }
+
+  SymFloat toSymFloat() const {
+    if (Tag::HAS_sd == tag) {
+      return c10::SymFloat(intrusive_ptr<SymNodeImpl>::reclaim_copy(
+          static_cast<SymNodeImpl*>(v.p)));
+    } else {
+      return toDouble();
+    }
+  }
+
+  SymBool toSymBool() const {
+    if (Tag::HAS_sb == tag) {
+      return c10::SymBool(intrusive_ptr<SymNodeImpl>::reclaim_copy(
+          static_cast<SymNodeImpl*>(v.p)));
+    } else {
+      return toBool();
+    }
+  }
+
+  // also support scalar.to<int64_t>();
+  // Deleted for unsupported types, but specialized below for supported types
+  template <typename T>
+  T to() const = delete;
+
+  // audit uses of data_ptr
+  const void* data_ptr() const {
+    TORCH_INTERNAL_ASSERT(!isSymbolic());
+    return static_cast<const void*>(&v);
+  }
+
+  bool isFloatingPoint() const {
+    return Tag::HAS_d == tag || Tag::HAS_sd == tag;
+  }
+
+  C10_DEPRECATED_MESSAGE(
+      "isIntegral is deprecated. Please use the overload with 'includeBool' parameter instead.")
+  bool isIntegral() const {
+    return Tag::HAS_i == tag || Tag::HAS_si == tag || Tag::HAS_u == tag;
+  }
+  bool isIntegral(bool includeBool) const {
+    return Tag::HAS_i == tag || Tag::HAS_si == tag || Tag::HAS_u == tag ||
+        (includeBool && isBoolean());
+  }
+
+  bool isComplex() const {
+    return Tag::HAS_z == tag;
+  }
+  bool isBoolean() const {
+    return Tag::HAS_b == tag || Tag::HAS_sb == tag;
+  }
+
+  // you probably don't actually want these; they're mostly for testing
+  bool isSymInt() const {
+    return Tag::HAS_si == tag;
+  }
+  bool isSymFloat() const {
+    return Tag::HAS_sd == tag;
+  }
+  bool isSymBool() const {
+    return Tag::HAS_sb == tag;
+  }
+
+  bool isSymbolic() const {
+    return Tag::HAS_si == tag || Tag::HAS_sd == tag || Tag::HAS_sb == tag;
+  }
+
+  C10_ALWAYS_INLINE Scalar& operator=(Scalar&& other) noexcept {
+    if (&other == this) {
+      return *this;
+    }
+
+    destroy();
+    moveFrom(std::move(other));
+    return *this;
+  }
+
+  C10_ALWAYS_INLINE Scalar& operator=(const Scalar& other) {
+    if (&other == this) {
+      return *this;
+    }
+
+    *this = Scalar(other);
+    return *this;
+  }
+
+  Scalar operator-() const;
+  Scalar conj() const;
+  Scalar log() const;
+
+  template <
+      typename T,
+      typename std::enable_if_t<!c10::is_complex<T>::value, int> = 0>
+  bool equal(T num) const {
+    if (isComplex()) {
+      TORCH_INTERNAL_ASSERT(!isSymbolic());
+      auto val = v.z;
+      return (val.real() == num) && (val.imag() == T());
+    } else if (isFloatingPoint()) {
+      TORCH_CHECK(!isSymbolic(), "NYI SymFloat equality");
+      return v.d == num;
+    } else if (tag == Tag::HAS_i) {
+      if (overflows<T>(v.i, /* strict_unsigned */ true)) {
+        return false;
+      } else {
+        return static_cast<T>(v.i) == num;
+      }
+    } else if (tag == Tag::HAS_u) {
+      if (overflows<T>(v.u, /* strict_unsigned */ true)) {
+        return false;
+      } else {
+        return static_cast<T>(v.u) == num;
+      }
+    } else if (tag == Tag::HAS_si) {
+      TORCH_INTERNAL_ASSERT(false, "NYI SymInt equality");
+    } else if (isBoolean()) {
+      // boolean scalar does not equal to a non boolean value
+      TORCH_INTERNAL_ASSERT(!isSymbolic());
+      return false;
+    } else {
+      TORCH_INTERNAL_ASSERT(false);
+    }
+  }
+
+  template <
+      typename T,
+      typename std::enable_if_t<c10::is_complex<T>::value, int> = 0>
+  bool equal(T num) const {
+    if (isComplex()) {
+      TORCH_INTERNAL_ASSERT(!isSymbolic());
+      return v.z == num;
+    } else if (isFloatingPoint()) {
+      TORCH_CHECK(!isSymbolic(), "NYI SymFloat equality");
+      return (v.d == num.real()) && (num.imag() == T());
+    } else if (tag == Tag::HAS_i) {
+      if (overflows<T>(v.i, /* strict_unsigned */ true)) {
+        return false;
+      } else {
+        return static_cast<T>(v.i) == num.real() && num.imag() == T();
+      }
+    } else if (tag == Tag::HAS_u) {
+      if (overflows<T>(v.u, /* strict_unsigned */ true)) {
+        return false;
+      } else {
+        return static_cast<T>(v.u) == num.real() && num.imag() == T();
+      }
+    } else if (tag == Tag::HAS_si) {
+      TORCH_INTERNAL_ASSERT(false, "NYI SymInt equality");
+    } else if (isBoolean()) {
+      // boolean scalar does not equal to a non boolean value
+      TORCH_INTERNAL_ASSERT(!isSymbolic());
+      return false;
+    } else {
+      TORCH_INTERNAL_ASSERT(false);
+    }
+  }
+
+  bool equal(bool num) const {
+    if (isBoolean()) {
+      TORCH_INTERNAL_ASSERT(!isSymbolic());
+      return static_cast<bool>(v.i) == num;
+    } else {
+      return false;
+    }
+  }
+
+  ScalarType type() const {
+    if (isComplex()) {
+      return ScalarType::ComplexDouble;
+    } else if (isFloatingPoint()) {
+      return ScalarType::Double;
+    } else if (isIntegral(/*includeBool=*/false)) {
+      // Represent all integers as long, UNLESS it is unsigned and therefore
+      // unrepresentable as long
+      if (Tag::HAS_u == tag) {
+        return ScalarType::UInt64;
+      }
+      return ScalarType::Long;
+    } else if (isBoolean()) {
+      return ScalarType::Bool;
+    } else {
+      throw std::runtime_error("Unknown scalar type.");
+    }
+  }
+
+  Scalar(Scalar&& rhs) noexcept : tag(rhs.tag) {
+    moveFrom(std::move(rhs));
+  }
+
+  Scalar(const Scalar& rhs) : tag(rhs.tag), v(rhs.v) {
+    if (isSymbolic()) {
+      c10::raw::intrusive_ptr::incref(v.p);
+    }
+  }
+
+  Scalar(c10::SymInt si) {
+    if (auto m = si.maybe_as_int()) {
+      tag = Tag::HAS_i;
+      v.i = *m;
+    } else {
+      tag = Tag::HAS_si;
+      v.p = std::move(si).release();
+    }
+  }
+
+  Scalar(c10::SymFloat sd) {
+    if (sd.is_symbolic()) {
+      tag = Tag::HAS_sd;
+      v.p = std::move(sd).release();
+    } else {
+      tag = Tag::HAS_d;
+      v.d = sd.as_float_unchecked();
+    }
+  }
+
+  Scalar(c10::SymBool sb) {
+    if (auto m = sb.maybe_as_bool()) {
+      tag = Tag::HAS_b;
+      v.i = *m;
+    } else {
+      tag = Tag::HAS_sb;
+      v.p = std::move(sb).release();
+    }
+  }
+
+  // We can't set v in the initializer list using the
+  // syntax v{ .member = ... } because it doesn't work on MSVC
+ private:
+  enum class Tag { HAS_d, HAS_i, HAS_u, HAS_z, HAS_b, HAS_sd, HAS_si, HAS_sb };
+
+  // Note [Meaning of HAS_u]
+  // ~~~~~~~~~~~~~~~~~~~~~~~
+  // HAS_u is a bit special.  On its face, it just means that we
+  // are holding an unsigned integer.  However, we generally don't
+  // distinguish between different bit sizes in Scalar (e.g., we represent
+  // float as double), instead, it represents a mathematical notion
+  // of some quantity (integral versus floating point).  So actually,
+  // HAS_u is used solely to represent unsigned integers that could
+  // not be represented as a signed integer.  That means only uint64_t
+  // potentially can get this tag; smaller types like uint8_t fits into a
+  // regular int and so for BC reasons we keep as an int.
+
+  // NB: assumes that self has already been cleared
+  // NOLINTNEXTLINE(cppcoreguidelines-rvalue-reference-param-not-moved)
+  C10_ALWAYS_INLINE void moveFrom(Scalar&& rhs) noexcept {
+    v = rhs.v;
+    tag = rhs.tag;
+    if (rhs.tag == Tag::HAS_si || rhs.tag == Tag::HAS_sd ||
+        rhs.tag == Tag::HAS_sb) {
+      // Move out of scalar
+      rhs.tag = Tag::HAS_i;
+      rhs.v.i = 0;
+    }
+  }
+
+  Tag tag;
+
+  union v_t {
+    double d{};
+    int64_t i;
+    // See Note [Meaning of HAS_u]
+    uint64_t u;
+    c10::complex<double> z;
+    c10::intrusive_ptr_target* p;
+    // NOLINTNEXTLINE(modernize-use-equals-default)
+    v_t() {} // default constructor
+  } v;
+
+  template <
+      typename T,
+      typename std::enable_if_t<
+          std::is_integral_v<T> && !std::is_same_v<T, bool>,
+          bool>* = nullptr>
+  Scalar(T vv, bool) : tag(Tag::HAS_i) {
+    v.i = convert<decltype(v.i), T>(vv);
+  }
+
+  template <
+      typename T,
+      typename std::enable_if_t<
+          !std::is_integral_v<T> && !c10::is_complex<T>::value,
+          bool>* = nullptr>
+  Scalar(T vv, bool) : tag(Tag::HAS_d) {
+    v.d = convert<decltype(v.d), T>(vv);
+  }
+
+  template <
+      typename T,
+      typename std::enable_if_t<c10::is_complex<T>::value, bool>* = nullptr>
+  Scalar(T vv, bool) : tag(Tag::HAS_z) {
+    v.z = convert<decltype(v.z), T>(vv);
+  }
+};
+
+using OptionalScalarRef = c10::OptionalRef<Scalar>;
+
+// define the scalar.to<int64_t>() specializations
+#define DEFINE_TO(T, name)         \
+  template <>                      \
+  inline T Scalar::to<T>() const { \
+    return to##name();             \
+  }
+AT_FORALL_SCALAR_TYPES_WITH_COMPLEX(DEFINE_TO)
+DEFINE_TO(uint16_t, UInt16)
+DEFINE_TO(uint32_t, UInt32)
+DEFINE_TO(uint64_t, UInt64)
+#undef DEFINE_TO
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/ScalarTypeToTypeMeta.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <c10/core/ScalarType.h>
+#include <c10/util/Optional.h>
+#include <c10/util/typeid.h>
+
+// these just expose TypeMeta/ScalarType bridge functions in c10
+// TODO move to typeid.h (or codemod away) when TypeMeta et al
+// are moved from caffe2 to c10 (see note at top of typeid.h)
+
+namespace c10 {
+
+/**
+ * convert ScalarType enum values to TypeMeta handles
+ */
+inline caffe2::TypeMeta scalarTypeToTypeMeta(ScalarType scalar_type) {
+  return caffe2::TypeMeta::fromScalarType(scalar_type);
+}
+
+/**
+ * convert TypeMeta handles to ScalarType enum values
+ */
+inline ScalarType typeMetaToScalarType(caffe2::TypeMeta dtype) {
+  return dtype.toScalarType();
+}
+
+/**
+ * typeMetaToScalarType(), lifted to optional
+ */
+inline std::optional<at::ScalarType> optTypeMetaToScalarType(
+    std::optional<caffe2::TypeMeta> type_meta) {
+  if (!type_meta.has_value()) {
+    return std::nullopt;
+  }
+  return type_meta->toScalarType();
+}
+
+/**
+ * convenience: equality across TypeMeta/ScalarType conversion
+ */
+inline bool operator==(ScalarType t, caffe2::TypeMeta m) {
+  return m.isScalarType(t);
+}
+
+inline bool operator==(caffe2::TypeMeta m, ScalarType t) {
+  return t == m;
+}
+
+inline bool operator!=(ScalarType t, caffe2::TypeMeta m) {
+  return !(t == m);
+}
+
+inline bool operator!=(caffe2::TypeMeta m, ScalarType t) {
+  return !(t == m);
+}
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/Storage.h

@@ -0,0 +1,272 @@
+#pragma once
+
+#include <c10/core/Allocator.h>
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/core/StorageImpl.h>
+#include <c10/core/SymInt.h>
+#include <c10/macros/Export.h>
+#include <c10/util/Exception.h>
+#include <c10/util/ExclusivelyOwned.h>
+#include <c10/util/MaybeOwned.h>
+#include <c10/util/UniqueVoidPtr.h>
+#include <c10/util/intrusive_ptr.h>
+#include <cstddef>
+#include <utility>
+
+namespace c10 {
+
+struct Storage;
+
+C10_API bool isSharedStorageAlias(
+    const Storage& storage0,
+    const Storage& storage1);
+
+struct C10_API Storage {
+ public:
+  struct use_byte_size_t {};
+  struct unsafe_borrow_t {
+    explicit unsafe_borrow_t() = default;
+  };
+
+  Storage() = default;
+  Storage(c10::intrusive_ptr<StorageImpl> ptr)
+      : storage_impl_(std::move(ptr)) {}
+
+  // Allocates memory buffer using given allocator and creates a storage with it
+  Storage(
+      use_byte_size_t /*use_byte_size*/,
+      const SymInt& size_bytes,
+      Allocator* allocator = nullptr,
+      bool resizable = false)
+      : storage_impl_(c10::make_intrusive<StorageImpl>(
+            StorageImpl::use_byte_size_t(),
+            size_bytes,
+            allocator,
+            resizable)) {}
+
+  // Creates storage with pre-allocated memory buffer. Allocator is given for
+  // potential future reallocations, however it can be nullptr if the storage
+  // is non-resizable
+  Storage(
+      use_byte_size_t /*use_byte_size*/,
+      size_t size_bytes,
+      at::DataPtr data_ptr,
+      at::Allocator* allocator = nullptr,
+      bool resizable = false)
+      : storage_impl_(c10::make_intrusive<StorageImpl>(
+            StorageImpl::use_byte_size_t(),
+            size_bytes,
+            std::move(data_ptr),
+            allocator,
+            resizable)) {}
+
+ protected:
+  explicit Storage(unsafe_borrow_t, const Storage& rhs)
+      : storage_impl_(c10::intrusive_ptr<c10::StorageImpl>::reclaim(
+            rhs.storage_impl_.get())) {}
+
+  friend MaybeOwnedTraits<Storage>;
+
+ public:
+  // Legacy constructor for partially initialized (dtype or memory) storages
+  // that can be temporarily created with Caffe2 APIs. See the note on top of
+  // TensorImpl.h for details.
+  static Storage create_legacy(at::Device device) {
+    auto allocator = GetAllocator(device.type());
+    return Storage(c10::make_intrusive<StorageImpl>(
+        StorageImpl::use_byte_size_t(),
+        0,
+        allocator->allocate(0), // materialize a non-default Device.
+        allocator,
+        true));
+  }
+
+  // Mimic create_legacy, but without requiring a newly-created StorageImpl.
+  void reset_legacy() {
+    TORCH_CHECK(resizable() && allocator());
+    set_nbytes(0);
+    set_data_ptr_noswap(allocator()->allocate(0));
+  }
+
+  // TODO: remove later
+  void set_nbytes(size_t size_bytes) const {
+    storage_impl_->set_nbytes(size_bytes);
+  }
+
+  void set_nbytes(c10::SymInt size_bytes) const {
+    storage_impl_->set_nbytes(std::move(size_bytes));
+  }
+
+  bool resizable() const {
+    return storage_impl_->resizable();
+  }
+
+  size_t nbytes() const {
+    return storage_impl_->nbytes();
+  }
+
+  SymInt sym_nbytes() const {
+    return storage_impl_->sym_nbytes();
+  }
+  // get() use here is to get const-correctness
+
+  const void* data() const {
+    return storage_impl_->data();
+  }
+
+  void* mutable_data() const {
+    return storage_impl_->mutable_data();
+  }
+
+  at::DataPtr& mutable_data_ptr() const {
+    return storage_impl_->mutable_data_ptr();
+  }
+
+  const at::DataPtr& data_ptr() const {
+    return storage_impl_->data_ptr();
+  }
+
+  // Returns the previous data_ptr
+  at::DataPtr set_data_ptr(at::DataPtr&& data_ptr) const {
+    return storage_impl_->set_data_ptr(std::move(data_ptr));
+  }
+
+  void set_data_ptr_noswap(at::DataPtr&& data_ptr) const {
+    return storage_impl_->set_data_ptr_noswap(std::move(data_ptr));
+  }
+
+  DeviceType device_type() const {
+    return storage_impl_->device_type();
+  }
+
+  at::Allocator* allocator() const {
+    return storage_impl_->allocator();
+  }
+
+  at::Device device() const {
+    return storage_impl_->device();
+  }
+
+  StorageImpl* unsafeReleaseStorageImpl() {
+    return storage_impl_.release();
+  }
+
+  StorageImpl* unsafeGetStorageImpl() const noexcept {
+    return storage_impl_.get();
+  }
+
+  c10::weak_intrusive_ptr<StorageImpl> getWeakStorageImpl() const {
+    return c10::weak_intrusive_ptr<StorageImpl>(storage_impl_);
+  }
+
+  operator bool() const {
+    return storage_impl_;
+  }
+
+  size_t use_count() const {
+    return storage_impl_.use_count();
+  }
+
+  inline bool unique() const {
+    return storage_impl_.unique();
+  }
+
+  bool is_alias_of(const Storage& other) const {
+    return (
+        storage_impl_ == other.storage_impl_ ||
+        isSharedStorageAlias(*this, other));
+  }
+
+  void UniqueStorageShareExternalPointer(
+      void* src,
+      size_t capacity,
+      DeleterFnPtr d = nullptr) {
+    if (!storage_impl_.unique()) {
+      TORCH_CHECK(
+          false,
+          "UniqueStorageShareExternalPointer can only be called when use_count == 1");
+    }
+    storage_impl_->UniqueStorageShareExternalPointer(src, capacity, d);
+  }
+
+  void UniqueStorageShareExternalPointer(
+      at::DataPtr&& data_ptr,
+      size_t capacity) {
+    if (!storage_impl_.unique()) {
+      TORCH_CHECK(
+          false,
+          "UniqueStorageShareExternalPointer can only be called when use_count == 1");
+    }
+    storage_impl_->UniqueStorageShareExternalPointer(
+        std::move(data_ptr), capacity);
+  }
+
+ protected:
+  c10::intrusive_ptr<StorageImpl> storage_impl_;
+};
+
+template <>
+struct MaybeOwnedTraits<c10::Storage> {
+  using owned_type = c10::Storage;
+  using borrow_type = c10::Storage;
+
+  static borrow_type createBorrow(const owned_type& from) {
+    return borrow_type(borrow_type::unsafe_borrow_t{}, from);
+  }
+
+  static void assignBorrow(borrow_type& lhs, const borrow_type& rhs) {
+    lhs.unsafeReleaseStorageImpl();
+    lhs = borrow_type(borrow_type::unsafe_borrow_t{}, rhs);
+  }
+
+  static void destroyBorrow(borrow_type& toDestroy) {
+    toDestroy.unsafeReleaseStorageImpl(); // "leak" it, but it was already +0.
+  }
+
+  static const owned_type& referenceFromBorrow(const borrow_type& borrow) {
+    return borrow;
+  }
+
+  static const owned_type* pointerFromBorrow(const borrow_type& borrow) {
+    return &borrow;
+  }
+
+  static bool debugBorrowIsValid(const borrow_type& /*borrow*/) {
+    return true;
+  }
+};
+
+template <>
+struct ExclusivelyOwnedTraits<c10::Storage> {
+  using repr_type = c10::Storage;
+  using pointer_type = c10::Storage*;
+  using const_pointer_type = const c10::Storage*;
+
+  static repr_type nullRepr() {
+    return c10::Storage();
+  }
+
+  template <class... Args>
+  static repr_type createInPlace(Args&&... args) {
+    return c10::Storage(std::forward<Args>(args)...);
+  }
+
+  static repr_type moveToRepr(c10::Storage&& x) {
+    return std::move(x);
+  }
+
+  static c10::Storage take(c10::Storage& x) {
+    return std::move(x);
+  }
+
+  static pointer_type getImpl(repr_type& x) {
+    return &x;
+  }
+
+  static const_pointer_type getImpl(const repr_type& x) {
+    return &x;
+  }
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/StorageImpl.h

@@ -0,0 +1,330 @@
+#pragma once
+
+#include <c10/core/Allocator.h>
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/core/SymInt.h>
+#include <c10/core/impl/COW.h>
+#include <c10/core/impl/COWDeleter.h>
+#include <c10/core/impl/PyObjectSlot.h>
+#include <c10/macros/Export.h>
+#include <c10/util/Exception.h>
+#include <c10/util/UniqueVoidPtr.h>
+#include <c10/util/intrusive_ptr.h>
+#include <cstddef>
+#include <utility>
+
+namespace c10 {
+
+C10_API void throwNullDataPtrError();
+C10_API void warnDeprecatedDataPtr();
+
+// A storage represents the underlying backing data buffer for a
+// tensor.  This concept was inherited from the original Torch7
+// codebase; we'd kind of like to get rid of the concept
+// (see https://github.com/pytorch/pytorch/issues/14797) but
+// it's hard work and no one has gotten around to doing it.
+//
+// NB: storage is supposed to uniquely own a data pointer; e.g.,
+// two non-null data pointers alias if and only if they are from
+// the same storage.  Technically you can violate this invariant
+// (e.g., you can create a non-owning StorageImpl with at::from_blob)
+// but a lot of things won't work correctly, including:
+//
+// - An ordinary deleter on such a storage is wrong, because normal deleters
+//   assume unique ownership, but if you have two storages at the same data,
+//   that implies there is some sort of shared ownership. So your deleter would
+//   have to actually be internally doing some sort of refcount thing
+// - Deepcopy in Python side relies on storage equality and not data pointer
+//   equality; so if there are two separate storages pointing to the same data,
+//   the data will actually get duplicated in that case (one data ptr before,
+//   two data ptrs after)
+// - Version counts won't work correctly, because we do all VC tracking at the
+//   level of storages (unless you explicitly disconnect the VC with detach);
+//   mutation because data pointers are the same are totally untracked
+struct C10_API StorageImpl : public c10::intrusive_ptr_target {
+ public:
+  struct use_byte_size_t {};
+
+  StorageImpl(
+      use_byte_size_t /*use_byte_size*/,
+      SymInt size_bytes,
+      at::DataPtr data_ptr,
+      at::Allocator* allocator,
+      bool resizable)
+      : data_ptr_(std::move(data_ptr)),
+        size_bytes_(std::move(size_bytes)),
+        size_bytes_is_heap_allocated_(size_bytes_.is_heap_allocated()),
+        resizable_(resizable),
+        received_cuda_(false),
+        allocator_(allocator) {
+    if (resizable) {
+      TORCH_INTERNAL_ASSERT(
+          allocator_, "For resizable storage, allocator must be provided");
+    }
+    refresh_has_data_ptr_check();
+  }
+
+  StorageImpl(
+      use_byte_size_t /*use_byte_size*/,
+      const SymInt& size_bytes,
+      at::Allocator* allocator,
+      bool resizable)
+      : StorageImpl(
+            use_byte_size_t(),
+            size_bytes,
+            size_bytes.is_heap_allocated()
+                ? allocator->allocate(0)
+                : allocator->allocate(size_bytes.as_int_unchecked()),
+            allocator,
+            resizable) {}
+
+  StorageImpl& operator=(StorageImpl&& other) = delete;
+  StorageImpl& operator=(const StorageImpl&) = delete;
+  StorageImpl() = delete;
+  StorageImpl(StorageImpl&& other) = delete;
+  StorageImpl(const StorageImpl&) = delete;
+  ~StorageImpl() override = default;
+
+  void reset() {
+    data_ptr_.clear();
+    size_bytes_ = 0;
+    size_bytes_is_heap_allocated_ = false;
+  }
+
+  // Destructor doesn't call release_resources because it's
+  // unnecessary; don't forget to change that if needed!
+  void release_resources() override {
+    data_ptr_.clear();
+  }
+
+  size_t nbytes() const {
+    // OK to do this instead of maybe_as_int as nbytes is guaranteed positive
+    TORCH_CHECK(!size_bytes_is_heap_allocated_);
+    return size_bytes_.as_int_unchecked();
+  }
+
+  SymInt sym_nbytes() const {
+    return size_bytes_;
+  }
+
+  // TODO: remove later
+  void set_nbytes(size_t size_bytes) {
+    size_bytes_ = static_cast<int64_t>(size_bytes);
+    size_bytes_is_heap_allocated_ = false;
+  }
+
+  void set_nbytes(c10::SymInt size_bytes) {
+    size_bytes_ = std::move(size_bytes);
+  }
+
+  bool resizable() const {
+    return resizable_;
+  }
+
+  const at::DataPtr& data_ptr() const {
+    return data_ptr_;
+  }
+
+  at::DataPtr& mutable_data_ptr() {
+    if (C10_UNLIKELY(has_data_ptr_check_)) {
+      if (throw_on_mutable_data_ptr_) {
+        throwNullDataPtrError();
+      }
+      if (warn_deprecated_on_mutable_data_ptr_) {
+        warnDeprecatedDataPtr();
+      }
+      maybe_materialize_cow();
+    }
+    return data_ptr_;
+  }
+
+  // Returns the data_ptr. Bypasses all checks.
+  at::DataPtr& _mutable_data_ptr_no_checks() {
+    return data_ptr_;
+  }
+
+  // Returns the previous data_ptr
+  at::DataPtr set_data_ptr(at::DataPtr&& data_ptr) {
+    // We need to materialize the old COW DataPtr because it is
+    // being returned as mutable.
+    maybe_materialize_cow();
+    return set_data_ptr_no_materialize_cow(std::move(data_ptr));
+  }
+
+  void set_data_ptr_noswap(at::DataPtr&& data_ptr) {
+    data_ptr_ = std::move(data_ptr);
+    refresh_has_data_ptr_check();
+  }
+
+  const void* data() const {
+    return data_ptr_.get();
+  }
+
+  void* mutable_data() {
+    if (C10_UNLIKELY(has_data_ptr_check_)) {
+      if (throw_on_mutable_data_ptr_) {
+        throwNullDataPtrError();
+      }
+      if (warn_deprecated_on_mutable_data_ptr_) {
+        warnDeprecatedDataPtr();
+      }
+      maybe_materialize_cow();
+    }
+    return data_ptr_.mutable_get();
+  }
+
+  at::DeviceType device_type() const {
+    return data_ptr_.device().type();
+  }
+
+  at::Allocator* allocator() {
+    return allocator_;
+  }
+
+  const at::Allocator* allocator() const {
+    return allocator_;
+  }
+
+  // You generally shouldn't use this method, but it is occasionally
+  // useful if you want to override how a tensor will be reallocated,
+  // after it was already allocated (and its initial allocator was
+  // set)
+  void set_allocator(at::Allocator* allocator) {
+    allocator_ = allocator;
+  }
+
+  Device device() const {
+    return data_ptr_.device();
+  }
+
+  void set_resizable(bool resizable) {
+    if (resizable) {
+      // We need an allocator to be resizable
+      AT_ASSERT(allocator_);
+    }
+    resizable_ = resizable;
+  }
+
+  /**
+   * Can only be called when use_count is 1
+   */
+  void UniqueStorageShareExternalPointer(
+      void* src,
+      size_t size_bytes,
+      DeleterFnPtr d = nullptr) {
+    UniqueStorageShareExternalPointer(
+        at::DataPtr(src, src, d, data_ptr_.device()), size_bytes);
+  }
+
+  /**
+   * Can only be called when use_count is 1
+   */
+  void UniqueStorageShareExternalPointer(
+      at::DataPtr&& data_ptr,
+      size_t size_bytes) {
+    data_ptr_ = std::move(data_ptr);
+    size_bytes_ = static_cast<int64_t>(size_bytes);
+    size_bytes_is_heap_allocated_ = false;
+    allocator_ = nullptr;
+    resizable_ = false;
+  }
+
+  // This method can be used only after storage construction and cannot be used
+  // to modify storage status
+  void set_received_cuda(bool received_cuda) {
+    received_cuda_ = received_cuda;
+  }
+
+  bool received_cuda() {
+    return received_cuda_;
+  }
+
+  impl::PyObjectSlot* pyobj_slot() {
+    return &pyobj_slot_;
+  }
+
+  const impl::PyObjectSlot* pyobj_slot() const {
+    return &pyobj_slot_;
+  }
+
+  void set_throw_on_mutable_data_ptr() {
+    throw_on_mutable_data_ptr_ = true;
+    refresh_has_data_ptr_check();
+  }
+
+  void set_warn_deprecated_on_mutable_data_ptr() {
+    warn_deprecated_on_mutable_data_ptr_ = true;
+    refresh_has_data_ptr_check();
+  }
+
+ protected:
+  // materialize_cow_storage needs to call set_data_ptr_no_materlize_cow
+  friend void c10::impl::cow::materialize_cow_storage(StorageImpl& storage);
+
+  // Returns the previous data_ptr. If the old data_ptr was COW,
+  // this avoids materializing it
+  at::DataPtr set_data_ptr_no_materialize_cow(at::DataPtr&& data_ptr) {
+    at::DataPtr old_data_ptr(std::move(data_ptr_));
+    data_ptr_ = std::move(data_ptr);
+    refresh_has_data_ptr_check();
+    return old_data_ptr;
+  }
+
+ private:
+  void refresh_has_data_ptr_check() {
+    has_data_ptr_check_ = is_cow() || throw_on_mutable_data_ptr_ ||
+        warn_deprecated_on_mutable_data_ptr_;
+  }
+
+  inline bool is_cow() const {
+    return c10::impl::cow::is_cow_data_ptr(data_ptr_);
+  }
+
+  // Triggers a copy if this is a copy-on-write tensor.
+  void maybe_materialize_cow() {
+    if (is_cow()) {
+      impl::cow::materialize_cow_storage(*this);
+    }
+  }
+
+  DataPtr data_ptr_;
+  SymInt size_bytes_;
+  bool size_bytes_is_heap_allocated_;
+  bool resizable_;
+  // Identifies that Storage was received from another process and doesn't have
+  // local to process cuda memory allocation
+  bool received_cuda_;
+  // All special checks in data/data_ptr calls are guarded behind this single
+  // boolean. This is for performance: .data/.data_ptr calls are commonly in the
+  // hot-path.
+  bool has_data_ptr_check_ = false;
+  // If we should throw when mutable_data_ptr() or mutable_data() is called.
+  bool throw_on_mutable_data_ptr_ = false;
+  // If we warn when mutable_data_ptr() or mutable_data() is called.
+  bool warn_deprecated_on_mutable_data_ptr_ = false;
+  Allocator* allocator_;
+  impl::PyObjectSlot pyobj_slot_;
+};
+
+// Declare StorageImpl create function pointer types.
+using StorageImplCreateHelper = intrusive_ptr<StorageImpl> (*)(
+    StorageImpl::use_byte_size_t,
+    SymInt size_bytes,
+    DataPtr data_ptr,
+    Allocator* allocator,
+    bool resizable);
+
+C10_API void SetStorageImplCreate(DeviceType t, StorageImplCreateHelper fptr);
+
+C10_API StorageImplCreateHelper GetStorageImplCreate(DeviceType t);
+
+C10_API c10::intrusive_ptr<c10::StorageImpl> make_storage_impl(
+    c10::StorageImpl::use_byte_size_t use_byte_size,
+    c10::SymInt size_bytes,
+    c10::DataPtr data_ptr,
+    c10::Allocator* allocator,
+    bool resizable,
+    std::optional<at::Device> device_opt);
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/Stream.h

@@ -0,0 +1,176 @@
+#pragma once
+
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/macros/Export.h>
+#include <c10/util/Exception.h>
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <ostream>
+
+namespace c10 {
+
+/// An index representing a specific stream.  A StreamId is not independently
+/// meaningful without knowing the Device it is associated with; try to
+/// use Stream rather than StreamId directly.
+///
+/// StreamIds are opaque; they are assigned by some DeviceType-specific
+/// numbering system which is not visible to the user.  HOWEVER, we
+/// guarantee that StreamId 0 is always a valid stream, and corresponds
+/// to some sort of "default" stream.
+using StreamId = int64_t;
+
+struct C10_API StreamData3 {
+  StreamId stream_id;
+  DeviceIndex device_index;
+  DeviceType device_type;
+};
+
+// NB: I decided not to call the above StreamIndex to avoid confusion with
+// DeviceIndex.  This way, you access device index with index(), and stream id
+// with id()
+
+/**
+ * A stream is a software mechanism used to synchronize launched kernels
+ * without requiring explicit synchronizations between kernels.  The basic
+ * model is that every kernel launch is associated with a stream: every
+ * kernel on the same stream is implicitly synchronized so that if I launch
+ * kernels A and B on the same stream, A is guaranteed to finish before B
+ * launches.  If I want B to run concurrently with A, I must schedule
+ * it on a different stream.
+ *
+ * The Stream class is a backend agnostic value class representing a stream
+ * which I may schedule a kernel on.  Every stream is associated with a device,
+ * which is recorded in stream, which is used to avoid confusion about which
+ * device a stream refers to.
+ *
+ * Streams are explicitly thread-safe, in the sense that it is OK to pass
+ * a Stream from one thread to another, and kernels queued from two different
+ * threads will still get serialized appropriately.  (Of course, the
+ * time when the kernels get queued is undetermined unless you synchronize
+ * host side ;)
+ *
+ * Stream does NOT have a default constructor.  Streams are for expert
+ * users; if you want to use Streams, we're going to assume you know
+ * how to deal with C++ template error messages if you try to
+ * resize() a vector of Streams.
+ *
+ * Known instances of streams in backends:
+ *
+ *  - cudaStream_t (CUDA)
+ *  - hipStream_t (HIP)
+ *  - cl_command_queue (OpenCL)  (NB: Caffe2's existing OpenCL integration
+ *    does NOT support command queues.)
+ *
+ * Because this class is device agnostic, it cannot provide backend-specific
+ * functionality (e.g., get the cudaStream_t of a CUDA stream.)  There are
+ * wrapper classes which provide this functionality, e.g., CUDAStream.
+ */
+class C10_API Stream final {
+ private:
+  Device device_;
+  StreamId id_;
+
+ public:
+  enum Unsafe { UNSAFE };
+  enum Default { DEFAULT };
+
+  /// Unsafely construct a stream from a Device and a StreamId.  In
+  /// general, only specific implementations of streams for a
+  /// backend should manufacture Stream directly in this way; other users
+  /// should use the provided APIs to get a stream.  In particular,
+  /// we don't require backends to give any guarantees about non-zero
+  /// StreamIds; they are welcome to allocate in whatever way they like.
+  explicit Stream(Unsafe, Device device, StreamId id)
+      : device_(device), id_(id) {}
+
+  /// Construct the default stream of a Device.  The default stream is
+  /// NOT the same as the current stream; default stream is a fixed stream
+  /// that never changes, whereas the current stream may be changed by
+  /// StreamGuard.
+  explicit Stream(Default, Device device) : device_(device), id_(0) {}
+
+  bool operator==(const Stream& other) const noexcept {
+    return this->device_ == other.device_ && this->id_ == other.id_;
+  }
+  bool operator!=(const Stream& other) const noexcept {
+    return !(*this == other);
+  }
+
+  Device device() const noexcept {
+    return device_;
+  }
+  DeviceType device_type() const noexcept {
+    return device_.type();
+  }
+  DeviceIndex device_index() const noexcept {
+    return device_.index();
+  }
+  StreamId id() const noexcept {
+    return id_;
+  }
+
+  // Enqueues a wait instruction in the stream's work queue.
+  // This instruction is a no-op unless the event is marked
+  // for recording. In that case the stream stops processing
+  // until the event is recorded.
+  template <typename T>
+  void wait(const T& event) const {
+    event.block(*this);
+  }
+
+  // Return whether all asynchronous work previously enqueued on this stream
+  // has completed running on the device.
+  bool query() const;
+
+  // Wait (by blocking the calling thread) until all asynchronous work enqueued
+  // on this stream has completed running on the device.
+  void synchronize() const;
+
+  // The purpose of this function is to more conveniently permit binding
+  // of Stream to and from Python.  Without packing, I have to setup a whole
+  // class with two fields (device and stream id); with packing I can just
+  // store a single uint64_t.
+  //
+  // The particular way we pack streams into a uint64_t is considered an
+  // implementation detail and should not be relied upon.
+  uint64_t hash() const noexcept {
+    // Concat these together into a 64-bit integer
+    uint64_t bits = static_cast<uint64_t>(device_type()) << 56 |
+        static_cast<uint64_t>(device_index()) << 48 |
+        // Remove the sign extension part of the 64-bit address because
+        // the id might be used to hold a pointer.
+        (static_cast<uint64_t>(id()) & ((1ull << 48) - 1));
+    return bits;
+  }
+
+  struct StreamData3 pack3() const {
+    return {id(), device_index(), device_type()};
+  }
+
+  static Stream unpack3(
+      StreamId stream_id,
+      DeviceIndex device_index,
+      DeviceType device_type) {
+    TORCH_CHECK(isValidDeviceType(device_type));
+    return Stream(UNSAFE, Device(device_type, device_index), stream_id);
+  }
+
+  // I decided NOT to provide setters on this class, because really,
+  // why would you change the device of a stream?  Just construct
+  // it correctly from the beginning dude.
+};
+
+C10_API std::ostream& operator<<(std::ostream& stream, const Stream& s);
+
+} // namespace c10
+
+namespace std {
+template <>
+struct hash<c10::Stream> {
+  size_t operator()(c10::Stream s) const noexcept {
+    return std::hash<uint64_t>{}(s.hash());
+  }
+};
+} // namespace std

videochat2/lib/python3.10/site-packages/torch/include/c10/core/StreamGuard.h

@@ -0,0 +1,170 @@
+#pragma once
+
+#include <c10/core/Device.h>
+#include <c10/core/Stream.h>
+#include <c10/core/impl/InlineStreamGuard.h>
+#include <c10/core/impl/VirtualGuardImpl.h>
+#include <c10/util/ArrayRef.h>
+#include <c10/util/Optional.h>
+
+namespace c10 {
+
+/**
+ * A StreamGuard is an RAII class that changes the current device
+ * to the device corresponding to some stream, and changes the
+ * default stream on that device to be this stream.
+ *
+ * Use of StreamGuard is HIGHLY discouraged in operator definitions.  In
+ * a single operator, you probably don't know enough about the global
+ * state of the world to profitably decide how to set streams.  Let
+ * the caller handle this appropriately, and just use the current stream
+ * in your operator code.
+ *
+ * This StreamGuard does NOT have an uninitialized state; it is guaranteed
+ * to reset the stream and device on exit.  If you are in a situation
+ * where you *might* want to setup a stream guard, see OptionalStreamGuard.
+ */
+struct StreamGuard {
+  /// No default constructor, see Note [Omitted default constructor from RAII]
+  explicit StreamGuard() = delete;
+
+  /// Set the current device to the device associated with the passed stream,
+  /// and set the current  stream on that device to the passed stream.
+  explicit StreamGuard(Stream stream) : guard_(stream) {}
+
+  /// Copy is disallowed
+  StreamGuard(const StreamGuard&) = delete;
+  StreamGuard& operator=(const StreamGuard&) = delete;
+
+  /// Move is disallowed, as StreamGuard does not have an uninitialized state,
+  /// which is required for moves on types with nontrivial destructors.
+  StreamGuard(StreamGuard&& other) = delete;
+  StreamGuard& operator=(StreamGuard&& other) = delete;
+
+  /// Resets the currently set stream to the original stream and
+  /// the currently set device to the original device.  Then,
+  /// set the current device to the device associated with the passed stream,
+  /// and set the current stream on that device to the passed stream.
+  ///
+  /// NOTE: this implementation may skip some stream/device setting if
+  /// it can prove that it is unnecessary.
+  ///
+  /// WARNING: reset_stream does NOT preserve previously set streams on
+  /// different devices.  If you need to set streams on multiple devices
+  /// on , use MultiStreamGuard instead.
+  void reset_stream(Stream stream) {
+    guard_.reset_stream(stream);
+  }
+
+  /// Returns the stream that was set at the time the guard was constructed.
+  Stream original_stream() const {
+    return guard_.original_stream();
+  }
+
+  /// Returns the most recent stream that was set using this device guard,
+  /// either from construction, or via set_stream.
+  Stream current_stream() const {
+    return guard_.current_stream();
+  }
+
+  /// Returns the most recent device that was set using this device guard,
+  /// either from construction, or via set_device/reset_device/set_index.
+  Device current_device() const {
+    return guard_.current_device();
+  }
+
+  /// Returns the device that was set at the most recent reset_stream(),
+  /// or otherwise the device at construction time.
+  Device original_device() const {
+    return guard_.original_device();
+  }
+
+ private:
+  c10::impl::InlineStreamGuard<impl::VirtualGuardImpl> guard_;
+};
+
+/**
+ * An OptionalStreamGuard is an RAII class that sets a device to some value on
+ * initialization, and resets the device to its original value on destruction.
+ * See OptionalDeviceGuard for more guidance on how to use this class.
+ */
+struct OptionalStreamGuard {
+  /// Create an uninitialized guard.
+  explicit OptionalStreamGuard() = default;
+
+  /// Set the current device to the device associated with the passed stream,
+  /// and set the current stream on that device to the passed stream.
+  explicit OptionalStreamGuard(Stream stream) : guard_(stream) {}
+
+  /// Set the current device to the device associated with the passed stream,
+  /// and set the current stream on that device to the passed stream,
+  /// if the passed stream is not nullopt.
+  explicit OptionalStreamGuard(std::optional<Stream> stream_opt)
+      : guard_(stream_opt) {}
+
+  /// Copy is disallowed
+  OptionalStreamGuard(const OptionalStreamGuard&) = delete;
+  OptionalStreamGuard& operator=(const OptionalStreamGuard&) = delete;
+
+  // See Note [Move construction for RAII guards is tricky]
+  OptionalStreamGuard(OptionalStreamGuard&& other) = delete;
+
+  // See Note [Move assignment for RAII guards is tricky]
+  OptionalStreamGuard& operator=(OptionalStreamGuard&& other) = delete;
+
+  /// Resets the currently set stream to the original stream and
+  /// the currently set device to the original device.  Then,
+  /// set the current device to the device associated with the passed stream,
+  /// and set the current stream on that device to the passed stream.
+  /// Initializes the guard if it was not previously initialized.
+  void reset_stream(Stream stream) {
+    guard_.reset_stream(stream);
+  }
+
+  /// Returns the stream that was set at the time the guard was most recently
+  /// initialized, or nullopt if the guard is uninitialized.
+  std::optional<Stream> original_stream() const {
+    return guard_.original_stream();
+  }
+
+  /// Returns the most recent  stream that was set using this stream guard,
+  /// either from construction, or via reset_stream, if the guard is
+  /// initialized, or nullopt if the guard is uninitialized.
+  std::optional<Stream> current_stream() const {
+    return guard_.current_stream();
+  }
+
+  /// Restore the original  device and stream, resetting this guard to
+  /// uninitialized state.
+  void reset() {
+    guard_.reset();
+  }
+
+ private:
+  c10::impl::InlineOptionalStreamGuard<impl::VirtualGuardImpl> guard_{};
+};
+
+/**
+ * A MultiStreamGuard is an RAII class that sets the current streams of a set of
+ * devices all at once, and resets them to their original values on destruction.
+ */
+struct MultiStreamGuard {
+  /// Set the current streams to the passed streams on each of their respective
+  /// devices.
+  explicit MultiStreamGuard(ArrayRef<Stream> streams) : guard_(streams) {}
+
+  /// Copy is disallowed
+  MultiStreamGuard(const MultiStreamGuard&) = delete;
+  MultiStreamGuard& operator=(const MultiStreamGuard&) = delete;
+
+  // See Note [Move construction for RAII guards is tricky]
+  MultiStreamGuard(MultiStreamGuard&& other) = delete;
+
+  // See Note [Move assignment for RAII guards is tricky]
+  MultiStreamGuard& operator=(MultiStreamGuard&& other) = delete;
+
+ private:
+  c10::impl::InlineMultiStreamGuard<impl::VirtualGuardImpl> guard_;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/SymIntArrayRef.h

@@ -0,0 +1,89 @@
+#pragma once
+
+#include <c10/core/SymInt.h>
+#include <c10/util/ArrayRef.h>
+#include <c10/util/DimVector.h>
+#include <c10/util/Exception.h>
+#include <c10/util/irange.h>
+#include <cstdint>
+#include <optional>
+
+namespace c10 {
+using SymIntArrayRef = ArrayRef<SymInt>;
+
+inline at::IntArrayRef asIntArrayRefUnchecked(c10::SymIntArrayRef ar) {
+  return IntArrayRef(reinterpret_cast<const int64_t*>(ar.data()), ar.size());
+}
+
+// TODO: a SymIntArrayRef containing a heap allocated large negative integer
+// can actually technically be converted to an IntArrayRef... but not with
+// the non-owning API we have here.  We can't reinterpet cast; we have to
+// allocate another buffer and write the integers into it.  If you need it,
+// we can do it.  But I don't think you need it.
+
+inline std::optional<at::IntArrayRef> asIntArrayRefSlowOpt(
+    c10::SymIntArrayRef ar) {
+  for (const c10::SymInt& sci : ar) {
+    if (sci.is_heap_allocated()) {
+      return std::nullopt;
+    }
+  }
+
+  return {asIntArrayRefUnchecked(ar)};
+}
+
+inline at::IntArrayRef asIntArrayRefSlow(
+    c10::SymIntArrayRef ar,
+    const char* file,
+    int64_t line) {
+  for (const c10::SymInt& sci : ar) {
+    TORCH_CHECK(
+        !sci.is_heap_allocated(),
+        file,
+        ":",
+        line,
+        ": SymIntArrayRef expected to contain only concrete integers");
+  }
+  return asIntArrayRefUnchecked(ar);
+}
+
+// Even slower than asIntArrayRefSlow, as it forces an allocation for a
+// destination int, BUT it is able to force specialization (it never errors)
+inline c10::DimVector asIntArrayRefSlowAlloc(
+    c10::SymIntArrayRef ar,
+    const char* file,
+    int64_t line) {
+  c10::DimVector res(ar.size(), 0);
+  for (const auto i : c10::irange(ar.size())) {
+    res[i] = ar[i].guard_int(file, line);
+  }
+  return res;
+}
+
+#define C10_AS_INTARRAYREF_SLOW(a) c10::asIntArrayRefSlow(a, __FILE__, __LINE__)
+#define C10_AS_INTARRAYREF_SLOW_ALLOC(a) \
+  c10::asIntArrayRefSlowAlloc(a, __FILE__, __LINE__)
+
+// Prefer using a more semantic constructor, like
+// fromIntArrayRefKnownNonNegative
+inline SymIntArrayRef fromIntArrayRefUnchecked(IntArrayRef array_ref) {
+  return SymIntArrayRef(
+      reinterpret_cast<const SymInt*>(array_ref.data()), array_ref.size());
+}
+
+inline SymIntArrayRef fromIntArrayRefKnownNonNegative(IntArrayRef array_ref) {
+  return fromIntArrayRefUnchecked(array_ref);
+}
+
+inline SymIntArrayRef fromIntArrayRefSlow(IntArrayRef array_ref) {
+  for (long i : array_ref) {
+    TORCH_CHECK(
+        SymInt::check_range(i),
+        "IntArrayRef contains an int that cannot be represented as a SymInt: ",
+        i);
+  }
+  return SymIntArrayRef(
+      reinterpret_cast<const SymInt*>(array_ref.data()), array_ref.size());
+}
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/TensorOptions.h

@@ -0,0 +1,787 @@
+#pragma once
+
+#include <c10/core/Backend.h>
+#include <c10/core/DefaultDtype.h>
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/core/DispatchKey.h>
+#include <c10/core/Layout.h>
+#include <c10/core/MemoryFormat.h>
+#include <c10/core/ScalarType.h>
+#include <c10/core/ScalarTypeToTypeMeta.h>
+
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Exception.h>
+#include <optional>
+
+#include <cstdint>
+#include <iosfwd>
+#include <string>
+#include <type_traits>
+#include <utility>
+
+namespace c10 {
+
+DispatchKey computeDispatchKey(
+    std::optional<ScalarType> dtype,
+    std::optional<Layout> layout,
+    std::optional<Device> device);
+
+inline ScalarType dtype_or_default(std::optional<ScalarType> dtype) {
+  return value_or_else(dtype, [] { return get_default_dtype_as_scalartype(); });
+}
+
+inline caffe2::TypeMeta dtype_or_default(
+    std::optional<caffe2::TypeMeta> dtype) {
+  return value_or_else(dtype, [] { return get_default_dtype(); });
+}
+
+inline Layout layout_or_default(std::optional<Layout> layout) {
+  return layout.value_or(kStrided);
+}
+
+inline Device device_or_default(std::optional<Device> device) {
+  return value_or_else(device, [] { return Device(kCPU); });
+}
+
+inline bool pinned_memory_or_default(std::optional<bool> pinned_memory) {
+  return pinned_memory.value_or(false);
+}
+
+/// A class to encapsulate construction axes of an Tensor.  TensorOptions was
+/// designed to support the Python style API for specifying construction options
+/// on factory functions, e.g.,
+///
+///     torch.zeros(2, 3, dtype=torch.int32)
+///
+/// Because C++ doesn't natively support keyword arguments, there must be
+/// another way of specifying keyword-like arguments.  TensorOptions is a
+/// builder class which can be used to construct this "dictionary" of keyword
+/// arguments: functions which support TensorOptions conventionally take this
+/// argument optionally as their last argument.
+///
+/// WARNING: In PyTorch, there are `torch::` variants of factory functions,
+/// e.g., torch::zeros for at::zeros.  These return Variables (while the
+/// stock ATen functions return plain Tensors).  If you mix these functions
+/// up, you WILL BE SAD.
+///
+/// Rather than use the constructor of this class directly, you should prefer to
+/// use the constructor functions, and then chain setter methods on top of them.
+///
+///     at::device(at::kCUDA).dtype(kInt)
+///     at::dtype(at::kInt)
+///
+/// Additionally, anywhere a TensorOptions is expected, you can directly
+/// pass at::kCUDA / at::kInt, and it will implicitly convert to a
+/// TensorOptions.
+///
+/// Here are some recommended ways to create a 2x2 tensor of zeros
+/// with certain properties.  These all *implicitly* make use of
+/// TensorOptions, even if they don't mention the class explicitly:
+///
+///     at::zeros({2,2}, at::kCUDA);
+///     at::zeros({2,2}, at::kLong);
+///     at::zeros({2,2}, at::device(at::kCUDA).dtype(at::kLong()));
+///     at::zeros({2,2}, at::device({at::kCUDA, 1})); // place on device 1
+///     at::zeros({2,2}, at::requires_grad());
+///
+
+/// NOTE [ TensorOptions Constructors ]
+///
+/// TensorOptions is like a dictionary with entries from the set:
+/// {requires_grad, device, dtype, layout}, where each entry may be
+/// unspecified (i.e., is optional). It is used to specify the properties of
+/// tensors in many places both in C++ internal and API, e.g., tensor factory
+/// methods like `at::empty({10}, options)`, tensor conversions like
+/// `tensor.to(...)`, etc.
+///
+/// To provide a simple API that is consistent with Python, where one can do
+/// `torch.empty(sizes, X)` with `X` being a `torch.device`, `torch.dtype`, or a
+/// `torch.layout`, we want TensorOptions to be implicitly convertible from
+/// `ScalarType dtype`, `Layout layout` and `Device device`. Therefore, we have
+/// three implicit constructors from each of these three types.
+///
+/// This is sufficient for `ScalarType` and `Layout` as they are simple Enum
+/// classes. However, `Device` is an ordinary class with implicit constructors
+/// `Device(DeviceType, DeviceIndex = -1)` and `Device(std::string)` to be
+/// consistent with Python API, where strings are treated as equivalent with a
+/// `torch.device` object (e.g., "cuda:1" can be passed to everywhere a
+/// `torch.device("cuda:1")` is accepted). To support the syntax
+/// `at::empty({10}, {kCUDA, 1})` and `tensor.to(kCUDA)`, we need to make sure
+/// that `TensorOptions` is implicitly constructible with any arguments that a
+/// `Device` can constructed from. So we have,
+///
+///    /* implicit */ TensorOptions(T&& device) : TensorOptions() {
+///      this->set_device(device);
+///    }
+///
+///    template <typename... Args,
+///             typename = std::enable_if_t<std::is_constructible<Device,
+///             Args&&...>::value>>
+///    /* implicit */  TensorOptions(Args&&... args)
+///     : TensorOptions(Device(std::forward<Args>(args)...)) {}
+///
+///
+/// But this will be problematic. Consider this: `TensorOptions({kCUDA, 1})`.
+/// Compiler will complain about ambiguity between the copy constructor and the
+/// `Device` constructor because `{kCUDA, 1}` can be converted to both a
+/// `TensorOption` and a `Device`.
+///
+/// To get around this, we templatize the `Device` constructor. Since overload
+/// resolution is done before template resolution, our problem is solved.
+
+DispatchKey computeDispatchKey(
+    std::optional<ScalarType> dtype,
+    std::optional<Layout> layout,
+    std::optional<Device> device);
+
+struct C10_API TensorOptions {
+  TensorOptions()
+      : requires_grad_(false),
+        pinned_memory_(false),
+        has_device_(false),
+        has_dtype_(false),
+        has_layout_(false),
+        has_requires_grad_(false),
+        has_pinned_memory_(false),
+        has_memory_format_(false) {}
+
+  /// Constructs a `TensorOptions` object with the given layout.
+  /* implicit */ TensorOptions(Layout layout) : TensorOptions() {
+    this->set_layout(layout);
+  }
+
+  /// Constructs a `TensorOptions` object with the given device.
+  /// See NOTE [ TensorOptions Constructors ] on why this is templatized.
+  template <
+      typename T,
+      typename = std::enable_if_t<std::is_same_v<std::decay_t<T>, Device>>>
+  /* implicit */ TensorOptions(T&& device) : TensorOptions() {
+    this->set_device(std::forward<T>(device));
+  }
+
+  /// Constructs a `TensorOptions` object from arguments allowed in `Device`
+  /// constructors.
+  ///
+  /// See NOTE [ TensorOptions Constructors ].
+  ///
+  /// NB: Ideally we only allow implicit constructors here. But there is no easy
+  ///     way to detect them. So we have this one that allows explicit
+  ///     constructors too.
+  template <
+      typename... Args,
+      typename = std::enable_if_t<std::is_constructible_v<Device, Args&&...>>>
+  /* implicit */ TensorOptions(Args&&... args)
+      : TensorOptions(Device(std::forward<Args>(args)...)) {}
+
+  /// Constructs a `TensorOptions` object with the given dtype.
+  /* implicit */ TensorOptions(caffe2::TypeMeta dtype) : TensorOptions() {
+    this->set_dtype(dtype);
+  }
+
+  /// legacy constructor to support ScalarType
+  /* implicit */ TensorOptions(ScalarType dtype) : TensorOptions() {
+    this->set_dtype(dtype);
+  }
+
+  /// Constructs a `TensorOptions` object with the given memory format.
+  /* implicit */ TensorOptions(MemoryFormat memory_format) : TensorOptions() {
+    set_memory_format(memory_format);
+  }
+
+  /// Return a copy of `TensorOptions` with `device` set to the given one, or
+  /// cleared if `device` is `nullopt`.
+  C10_NODISCARD TensorOptions
+  device(std::optional<Device> device) const noexcept {
+    TensorOptions r = *this;
+    r.set_device(device);
+    return r;
+  }
+
+  /// Return a copy of `TensorOptions` with `device` set to the given one.
+  /// (This overload ensures that variadic template std::optional constructor
+  /// for Device work correctly.)
+  template <typename... Args>
+  C10_NODISCARD TensorOptions device(Args&&... args) const noexcept {
+    return device(
+        std::optional<Device>(std::in_place, std::forward<Args>(args)...));
+  }
+
+  /// Return a copy of `TensorOptions`, but with device set to CUDA, and the
+  /// device index set to the given one.
+  ///
+  /// TODO: This function encourages bad behavior (assuming CUDA is
+  /// the only device that matters).  Get rid of it / rename it.
+  C10_NODISCARD TensorOptions
+  device_index(c10::DeviceIndex device_index) const noexcept {
+    return device(Device::Type::CUDA, device_index);
+  }
+
+  /// Return a copy of `TensorOptions` with `dtype` set to the given one.
+  C10_NODISCARD TensorOptions
+  dtype(std::optional<caffe2::TypeMeta> dtype) const noexcept {
+    TensorOptions r = *this;
+    r.set_dtype(dtype);
+    return r;
+  }
+
+  // legacy function to support ScalarType
+  C10_NODISCARD TensorOptions
+  dtype(std::optional<ScalarType> dtype) const noexcept {
+    TensorOptions r = *this;
+    r.set_dtype(dtype);
+    return r;
+  }
+
+  // Since dtype is taken...
+  template <typename T>
+  TensorOptions& dtype() {
+    dtype_ = caffe2::TypeMeta::Make<T>();
+    has_dtype_ = true;
+    return *this;
+  }
+
+  /// Sets the layout of the `TensorOptions`.
+  C10_NODISCARD TensorOptions
+  layout(std::optional<Layout> layout) const noexcept {
+    TensorOptions r = *this;
+    r.set_layout(layout);
+    return r;
+  }
+
+  /// Sets the `requires_grad` property of the `TensorOptions`.
+  C10_NODISCARD TensorOptions
+  requires_grad(std::optional<bool> requires_grad) const noexcept {
+    TensorOptions r = *this;
+    r.set_requires_grad(requires_grad);
+    return r;
+  }
+
+  /// Sets the `pinned_memory` property on the `TensorOptions`.
+  C10_NODISCARD TensorOptions
+  pinned_memory(std::optional<bool> pinned_memory) const noexcept {
+    TensorOptions r = *this;
+    r.set_pinned_memory(pinned_memory);
+    return r;
+  }
+
+  /// Sets the `memory_format` property on `TensorOptions`.
+  C10_NODISCARD TensorOptions
+  memory_format(std::optional<MemoryFormat> memory_format) const noexcept {
+    TensorOptions r = *this;
+    r.set_memory_format(memory_format);
+    return r;
+  }
+
+  /// Returns the device of the `TensorOptions`.
+  Device device() const noexcept {
+    return device_or_default(device_opt());
+  }
+
+  /// Returns whether the device is specified.
+  bool has_device() const noexcept {
+    return has_device_;
+  }
+
+  /// Returns the device of the `TensorOptions`, or `std::nullopt` if
+  /// device is not specified.
+  std::optional<Device> device_opt() const noexcept {
+    return has_device_ ? std::make_optional(device_) : std::nullopt;
+  }
+
+  /// Returns the device index of the `TensorOptions`.
+  c10::DeviceIndex device_index() const noexcept {
+    return device().index();
+  }
+
+  /// Returns the dtype of the `TensorOptions`.
+  caffe2::TypeMeta dtype() const noexcept {
+    return dtype_or_default(dtype_opt());
+  }
+
+  /// Returns whether the dtype is specified.
+  bool has_dtype() const noexcept {
+    return has_dtype_;
+  }
+
+  /// Returns the dtype of the `TensorOptions`, or `std::nullopt` if
+  /// device is not specified.
+  std::optional<caffe2::TypeMeta> dtype_opt() const noexcept {
+    return has_dtype_ ? std::make_optional(dtype_) : std::nullopt;
+  }
+
+  /// Returns the layout of the `TensorOptions`.
+  Layout layout() const noexcept {
+    return layout_or_default(layout_opt());
+  }
+
+  /// Returns whether the layout is specified.
+  bool has_layout() const noexcept {
+    return has_layout_;
+  }
+
+  /// Returns the layout of the `TensorOptions`, or `std::nullopt` if
+  /// layout is not specified.
+  std::optional<Layout> layout_opt() const noexcept {
+    return has_layout_ ? std::make_optional(layout_) : std::nullopt;
+  }
+
+  /// Returns the `requires_grad` property of the `TensorOptions`.
+  bool requires_grad() const noexcept {
+    return has_requires_grad_ ? requires_grad_ : false;
+  }
+
+  /// Returns whether the `requires_grad` is specified.
+  bool has_requires_grad() const noexcept {
+    return has_requires_grad_;
+  }
+
+  /// Returns the `requires_grad` property of the `TensorOptions`, or
+  /// `std::nullopt` if `requires_grad` is not specified.
+  std::optional<bool> requires_grad_opt() const noexcept {
+    return has_requires_grad_ ? std::make_optional(requires_grad_)
+                              : std::nullopt;
+  }
+
+  /// Returns the `pinned_memory` property of the `TensorOptions`.
+  bool pinned_memory() const noexcept {
+    return pinned_memory_or_default(pinned_memory_opt());
+  }
+
+  /// Returns whether the `pinned_memory` is specified.
+  bool has_pinned_memory() const noexcept {
+    return has_pinned_memory_;
+  }
+
+  /// Returns if the layout is sparse
+  bool is_sparse() const {
+    return layout_ == c10::Layout::Sparse;
+  }
+
+  /// Returns if the layout is sparse CSR, deprecated, use
+  /// is_sparse_compressed() instead
+  bool is_sparse_csr() const {
+    return layout_ == c10::Layout::SparseCsr;
+  }
+
+  bool is_sparse_compressed() const {
+    return layout_ == c10::Layout::SparseCsr ||
+        layout_ == c10::Layout::SparseCsc ||
+        layout_ == c10::Layout::SparseBsr || layout_ == c10::Layout::SparseBsc;
+  }
+
+  // For compatibility with legacy tensor.type() comparisons
+  bool type_equal(const TensorOptions& other) const {
+    return computeDispatchKey() == other.computeDispatchKey() &&
+        typeMetaToScalarType(dtype_) == typeMetaToScalarType(other.dtype());
+  }
+
+  /// Returns the `pinned_memory` property of the `TensorOptions`, or
+  /// `std::nullopt` if `pinned_memory` is not specified.
+  std::optional<bool> pinned_memory_opt() const noexcept {
+    return has_pinned_memory_ ? std::make_optional(pinned_memory_)
+                              : std::nullopt;
+  }
+
+  /// Returns whether the `memory_layout` is specified
+  bool has_memory_format() const noexcept {
+    return has_memory_format_;
+  }
+
+  // NB: memory_format() getter is PURPOSELY not defined, as the default
+  // behavior of memory_format varies from function to function.
+
+  /// Returns the `memory_layout` property of `TensorOptions, or
+  /// `std::nullopt` if `memory_format` is not specified.
+  std::optional<MemoryFormat> memory_format_opt() const noexcept {
+    return has_memory_format_ ? std::make_optional(memory_format_)
+                              : std::nullopt;
+  }
+
+  // Resolves the ATen backend specified by the current construction axes.
+  // TODO: Deprecate this
+  Backend backend() const {
+    return at::dispatchKeyToBackend(computeDispatchKey());
+  }
+
+  /// Return the right-biased merge of two TensorOptions.  This has the
+  /// effect of overwriting settings from self with specified options
+  /// of options.
+  ///
+  /// NB: This merging operation does NOT respect device merges.
+  /// For example, if you device({kCUDA, 1}).merge_in(kCUDA)
+  /// you will get kCUDA in the end!  Functions like Tensor.new_empty
+  /// ensure the right device is selected anyway by way of a
+  /// device guard.
+  ///
+  TensorOptions merge_in(TensorOptions options) const noexcept {
+    TensorOptions merged = *this;
+    if (options.has_device())
+      merged.set_device(options.device_opt());
+    if (options.has_dtype())
+      merged.set_dtype(options.dtype_opt());
+    if (options.has_layout())
+      merged.set_layout(options.layout_opt());
+    // NB: requires grad is right biased; not a logical AND/OR!
+    if (options.has_requires_grad())
+      merged.set_requires_grad(options.requires_grad_opt());
+    if (options.has_pinned_memory())
+      merged.set_pinned_memory(options.pinned_memory_opt());
+    if (options.has_memory_format())
+      merged.set_memory_format(options.memory_format_opt());
+    return merged;
+  }
+
+  // TODO remove after TensorOptions rationalization
+  TensorOptions merge_memory_format(
+      std::optional<MemoryFormat> optional_memory_format) const noexcept {
+    TensorOptions merged = *this;
+    if (optional_memory_format.has_value()) {
+      merged.set_memory_format(*optional_memory_format);
+    }
+    return merged;
+  }
+
+  // INVARIANT: computeDispatchKey returns only the subset of dispatch keys for
+  // which dispatchKeyToBackend is injective, if it is defined at all  (for
+  // the most part, this just means that this function never returns an
+  // Autograd key)
+  DispatchKey computeDispatchKey() const {
+    return c10::computeDispatchKey(
+        optTypeMetaToScalarType(dtype_opt()), layout_opt(), device_opt());
+  }
+
+ private:
+  // These methods are currently private because I'm not sure if it's wise
+  // to actually publish them.  They are methods because I need them in
+  // the constructor and the functional API implementation.
+  //
+  // If you really, really need it, you can make these public, but check if you
+  // couldn't just do what you need with the functional API.  Similarly, these
+  // methods are not chainable, because if you wanted chaining, you probably
+  // want to use the functional API instead.  (It's probably OK to make
+  // these chainable, because these functions are all explicitly annotated
+  // with a ref-qualifier, the trailing &, that makes them illegal to call
+  // on temporaries.)
+
+  /// Mutably set the device of `TensorOptions`.
+  void set_device(std::optional<Device> device) & noexcept {
+    if (device) {
+      device_ = *device;
+      has_device_ = true;
+    } else {
+      has_device_ = false;
+    }
+  }
+
+  /// Mutably set the dtype of `TensorOptions`.
+  void set_dtype(std::optional<caffe2::TypeMeta> dtype) & noexcept {
+    if (dtype) {
+      dtype_ = *dtype;
+      has_dtype_ = true;
+    } else {
+      has_dtype_ = false;
+    }
+  }
+
+  // legacy function to support ScalarType
+  void set_dtype(std::optional<ScalarType> dtype) & noexcept {
+    if (dtype) {
+      dtype_ = scalarTypeToTypeMeta(*dtype);
+      has_dtype_ = true;
+    } else {
+      has_dtype_ = false;
+    }
+  }
+
+  /// Mutably set the layout of `TensorOptions`.
+  void set_layout(std::optional<Layout> layout) & noexcept {
+    if (layout) {
+      layout_ = *layout;
+      has_layout_ = true;
+    } else {
+      has_layout_ = false;
+    }
+  }
+
+  /// Mutably set the `requires_grad` property of `TensorOptions`.
+  void set_requires_grad(std::optional<bool> requires_grad) & noexcept {
+    if (requires_grad) {
+      requires_grad_ = *requires_grad;
+      has_requires_grad_ = true;
+    } else {
+      has_requires_grad_ = false;
+    }
+  }
+
+  /// Mutably set the `pinned_memory` property of `TensorOptions`.
+  void set_pinned_memory(std::optional<bool> pinned_memory) & noexcept {
+    if (pinned_memory) {
+      pinned_memory_ = *pinned_memory;
+      has_pinned_memory_ = true;
+    } else {
+      has_pinned_memory_ = false;
+    }
+  }
+
+  /// Mutably set the `memory_Format` property of `TensorOptions`.
+  void set_memory_format(std::optional<MemoryFormat> memory_format) & noexcept {
+    if (memory_format) {
+      memory_format_ = *memory_format;
+      has_memory_format_ = true;
+    } else {
+      has_memory_format_ = false;
+    }
+  }
+
+  // WARNING: If you edit TensorOptions to add more options, you
+  // may need to adjust the implementation of Tensor::options.
+  // The criteria for whether or not Tensor::options must be adjusted
+  // is whether or not the new option you added should preserved
+  // by functions such as empty_like(); if it should be preserved,
+  // you must adjust options().
+  //
+  // TODO: MemoryFormat is not implemented in this way
+
+  // NB: We didn't use std::optional here, because then we can't pack
+  // the has_***_ boolean fields.
+
+  Device device_ = at::kCPU; // 16-bit
+  caffe2::TypeMeta dtype_ = caffe2::TypeMeta::Make<float>(); // 16-bit
+  Layout layout_ = at::kStrided; // 8-bit
+  MemoryFormat memory_format_ = MemoryFormat::Contiguous; // 8-bit
+
+  // Bitmask required here to get this to fit inside 32 bits (or even 64 bits,
+  // for that matter)
+
+  bool requires_grad_ : 1;
+  bool pinned_memory_ : 1;
+
+  bool has_device_ : 1;
+  bool has_dtype_ : 1;
+  bool has_layout_ : 1;
+  bool has_requires_grad_ : 1;
+  bool has_pinned_memory_ : 1;
+  bool has_memory_format_ : 1;
+};
+
+// We should aspire to fit in one machine-size word; but a size greater than two
+// words is too much.  (We are doing terribly on 32-bit archs, where we require
+// three machine size words to store tensor options.  Eek!)
+static_assert(
+    sizeof(TensorOptions) <= sizeof(int64_t) * 2,
+    "TensorOptions must fit in 128-bits");
+
+/// Convenience function that returns a `TensorOptions` object with the `dtype`
+/// set to the given one.
+inline TensorOptions dtype(caffe2::TypeMeta dtype) {
+  return TensorOptions().dtype(dtype);
+}
+
+// legacy function to support ScalarType
+inline TensorOptions dtype(ScalarType dtype) {
+  return TensorOptions().dtype(scalarTypeToTypeMeta(dtype));
+}
+
+/// Convenience function that returns a `TensorOptions` object with the `layout`
+/// set to the given one.
+inline TensorOptions layout(Layout layout) {
+  return TensorOptions().layout(layout);
+}
+
+/// Convenience function that returns a `TensorOptions` object with the `device`
+/// set to the given one.
+inline TensorOptions device(Device device) {
+  return TensorOptions().device(device);
+}
+
+/// Convenience function that returns a `TensorOptions` object with the
+/// `device` set to CUDA and the `device_index` set to the given one.
+inline TensorOptions device_index(c10::DeviceIndex device_index) {
+  return TensorOptions().device_index(device_index);
+}
+
+/// Convenience function that returns a `TensorOptions` object with the
+/// `requires_grad` set to the given one.
+inline TensorOptions requires_grad(bool requires_grad = true) {
+  return TensorOptions().requires_grad(requires_grad);
+}
+
+/// Convenience function that returns a `TensorOptions` object with the
+/// `memory_format` set to the given one.
+inline TensorOptions memory_format(MemoryFormat memory_format) {
+  return TensorOptions().memory_format(memory_format);
+}
+
+C10_API std::ostream& operator<<(
+    std::ostream& stream,
+    const TensorOptions& options);
+
+template <typename T>
+inline TensorOptions dtype() {
+  return dtype(caffe2::TypeMeta::Make<T>());
+}
+
+inline std::string toString(const TensorOptions& options) {
+  std::ostringstream stream;
+  stream << options;
+  return stream.str();
+}
+
+// This is intended to be a centralized location by which we can determine
+// what an appropriate DispatchKey for a tensor is.
+inline DispatchKey computeDispatchKey(
+    std::optional<ScalarType> dtype,
+    std::optional<Layout> layout,
+    std::optional<Device> device) {
+  const auto layout_ = layout_or_default(layout);
+  const auto device_ = device_or_default(device);
+  switch (layout_) {
+    case Layout::Jagged:
+    case Layout::Strided: {
+      const auto dtype_ = dtype_or_default(dtype);
+      switch (device_.type()) {
+#define DO_CASE(device, _)                   \
+  case c10::DeviceType::device: {            \
+    if (isQIntType(dtype_)) {                \
+      return DispatchKey::Quantized##device; \
+    }                                        \
+    return DispatchKey::device;              \
+  }
+        C10_FORALL_BACKEND_DEVICE_TYPES(DO_CASE, unused)
+#undef DO_CASE
+        case c10::DeviceType::FPGA:
+          return DispatchKey::FPGA;
+        case c10::DeviceType::MAIA:
+          return DispatchKey::MAIA;
+        case c10::DeviceType::Vulkan:
+          return DispatchKey::Vulkan;
+        case c10::DeviceType::Metal:
+          return DispatchKey::Metal;
+        case c10::DeviceType::MKLDNN:
+        case c10::DeviceType::OPENGL:
+        case c10::DeviceType::OPENCL:
+        case c10::DeviceType::IDEEP:
+          TORCH_INTERNAL_ASSERT(
+              0,
+              "This is a grandfathered Caffe2 device type ",
+              device_.type(),
+              ", it shouldn't ever convert to a DispatchKey.  File a bug describing what you were doing if you think this is in error.");
+        default:
+          TORCH_CHECK_NOT_IMPLEMENTED(
+              false,
+              "Unsupported device type for dense layout: ",
+              device_.type());
+      }
+    }
+    case Layout::Sparse:
+      switch (device_.type()) {
+#define DO_CASE(device, _)              \
+  case c10::DeviceType::device: {       \
+    return DispatchKey::Sparse##device; \
+  }
+        C10_FORALL_BACKEND_DEVICE_TYPES(DO_CASE, unused)
+#undef DO_CASE
+        default:
+          TORCH_CHECK_NOT_IMPLEMENTED(
+              false,
+              "Unsupported device type for sparse layout: ",
+              device_.type());
+      }
+    case Layout::Mkldnn:
+      switch (device_.type()) {
+        case c10::DeviceType::CPU:
+          return DispatchKey::MkldnnCPU;
+        default:
+          TORCH_CHECK_NOT_IMPLEMENTED(
+              false,
+              "Unsupported device type for mkldnn layout: ",
+              device_.type());
+      }
+    case Layout::SparseCsr:
+    case Layout::SparseCsc:
+    case Layout::SparseBsr:
+    case Layout::SparseBsc:
+      switch (device_.type()) {
+#define DO_CASE(device, _)                 \
+  case c10::DeviceType::device: {          \
+    return DispatchKey::SparseCsr##device; \
+  }
+        C10_FORALL_BACKEND_DEVICE_TYPES(DO_CASE, unused)
+#undef DO_CASE
+        default:
+          TORCH_CHECK_NOT_IMPLEMENTED(
+              false,
+              "Unsupported device type for ",
+              layout_,
+              " layout: ",
+              device_.type());
+      }
+    default:
+      TORCH_CHECK(false, "Unsupported layout: ", layout_);
+  }
+}
+
+inline Layout dispatchKeyToLayout(DispatchKey dispatch_key) {
+  switch (dispatch_key) {
+#define DO_CASE(bc, _) case DispatchKey::Sparse##bc:
+    C10_FORALL_BACKEND_COMPONENTS(DO_CASE, unused)
+#undef DO_CASE
+    return Layout::Sparse;
+#define DO_CASE(bc, _) case DispatchKey::SparseCsr##bc:
+    C10_FORALL_BACKEND_COMPONENTS(DO_CASE, unused)
+#undef DO_CASE
+    TORCH_CHECK(
+        false, "Cannot map DispatchKey ", dispatch_key, " to a unique layout.");
+    case DispatchKey::MkldnnCPU:
+      return Layout::Mkldnn;
+    default:
+      return Layout::Strided;
+  }
+}
+
+inline c10::DeviceType dispatchKeyToDeviceType(DispatchKey dispatch_key) {
+  switch (dispatch_key) {
+    // stuff that's real
+#define DO_CASE(suffix, prefix)     \
+  case DispatchKey::prefix##suffix: \
+    return c10::DeviceType::suffix;
+#define DO_CASES(_, prefix) C10_FORALL_BACKEND_DEVICE_TYPES(DO_CASE, prefix)
+    C10_FORALL_FUNCTIONALITY_KEYS(DO_CASES)
+#undef DO_CASES
+#undef DO_CASE
+
+    case DispatchKey::MkldnnCPU:
+      return c10::DeviceType::CPU;
+    case DispatchKey::Vulkan:
+      return c10::DeviceType::Vulkan;
+
+    case DispatchKey::MAIA:
+      return c10::DeviceType::MAIA;
+    default:
+      TORCH_CHECK(
+          false,
+          "DispatchKey ",
+          dispatch_key,
+          " doesn't correspond to a device");
+  }
+}
+
+inline TensorOptions dispatchKeyToTensorOptions(DispatchKey dispatch_key) {
+  return TensorOptions()
+      .layout(dispatchKeyToLayout(dispatch_key))
+      .device(dispatchKeyToDeviceType(dispatch_key));
+}
+
+namespace detail {
+inline bool backend_supports_empty_operator(const TensorOptions& options) {
+  // Quantized backends don't support at::empty().
+  // They have separate operators like at::empty_quantized() that take in
+  // extra information about how to quantize the tensor.
+  return !isQIntType(typeMetaToScalarType(options.dtype()));
+}
+
+} // namespace detail
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/UndefinedTensorImpl.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <c10/core/MemoryFormat.h>
+#include <c10/core/SymIntArrayRef.h>
+#include <c10/core/TensorImpl.h>
+#include <c10/macros/Export.h>
+#include <c10/util/ArrayRef.h>
+#include <cstdint>
+
+namespace c10 {
+
+struct C10_API UndefinedTensorImpl final : public TensorImpl {
+ public:
+  // Without this, we get:
+  //  error: identifier "at::UndefinedTensorImpl::_singleton" is undefined in
+  //  device code
+  // (ostensibly because the constexpr tricks MSVC into trying to compile this
+  // function for device as well).
+#ifdef _WIN32
+  static inline TensorImpl* singleton() {
+    return &getInstance();
+  }
+#else
+  static constexpr inline TensorImpl* singleton() {
+    return &_singleton;
+  }
+#endif
+
+#ifdef DEBUG
+  bool has_storage() const override;
+#endif
+  void set_storage_offset(int64_t offset) override;
+
+ protected:
+  bool is_contiguous_custom(MemoryFormat format) const override;
+  IntArrayRef strides_custom() const override;
+  SymIntArrayRef sym_strides_custom() const override;
+
+ private:
+  UndefinedTensorImpl();
+#ifdef _WIN32
+  static UndefinedTensorImpl& getInstance();
+#else
+  static UndefinedTensorImpl _singleton;
+#endif
+  const char* tensorimpl_type_name() const override;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/alignment.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <cstddef>
+
+namespace c10 {
+
+#ifdef C10_MOBILE
+// Use 16-byte alignment on mobile
+// - ARM NEON AArch32 and AArch64
+// - x86[-64] < AVX
+constexpr size_t gAlignment = 16;
+#else
+// Use 64-byte alignment should be enough for computation up to AVX512.
+constexpr size_t gAlignment = 64;
+#endif
+
+constexpr size_t gPagesize = 4096;
+// since the default thp pagesize is 2MB, enable thp only
+// for buffers of size 2MB or larger to avoid memory bloating
+constexpr size_t gAlloc_threshold_thp = static_cast<size_t>(2) * 1024 * 1024;
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/impl/COWDeleter.h

@@ -0,0 +1,66 @@
+#pragma once
+
+#include <c10/macros/Export.h>
+#include <c10/util/UniqueVoidPtr.h>
+
+#include <atomic>
+#include <cstdint>
+#include <memory>
+#include <shared_mutex>
+#include <variant>
+
+namespace c10::impl::cow {
+
+// A COWDeleterContext object is used as the `ctx` argument for DataPtr
+// to implement a Copy-on-write (COW) DataPtr.
+class C10_API COWDeleterContext {
+ public:
+  // Creates an instance, holding the pair of data and original
+  // deleter.
+  //
+  // Note that the deleter will only be called in our destructor if
+  // the last reference to this goes away without getting
+  // materialized.
+  explicit COWDeleterContext(std::unique_ptr<void, DeleterFnPtr> data);
+
+  // Increments the current refcount.
+  void increment_refcount();
+
+  // See README.md in this directory to understand the locking
+  // strategy.
+
+  // Represents a reference to the context.
+  //
+  // This is returned by decrement_refcount to allow the caller to
+  // copy the data under the shared lock.
+  using NotLastReference = std::shared_lock<std::shared_mutex>;
+
+  // Represents the last reference to the context.
+  //
+  // This will be returned by decrement_refcount when it is the last
+  // reference remaining and after any pending copies have completed.
+  using LastReference = std::unique_ptr<void, DeleterFnPtr>;
+
+  // Decrements the refcount, returning a handle indicating what to
+  // do with it.
+  std::variant<NotLastReference, LastReference> decrement_refcount();
+
+ private:
+  // The destructor is hidden, this should only ever be used within
+  // UniqueVoidPtr using cow::delete_context as the deleter.
+  ~COWDeleterContext();
+
+  std::shared_mutex mutex_;
+  std::unique_ptr<void, DeleterFnPtr> data_;
+  std::atomic<std::int64_t> refcount_ = 1;
+};
+
+// `cow_deleter` is used as the `ctx_deleter` for DataPtr to implement a COW
+// DataPtr.
+//
+// Warning: This should only be called on a pointer to a COWDeleterContext that
+// was allocated on the heap with `new`, because when the refcount reaches 0,
+// the context is deleted with `delete`.
+C10_API void cow_deleter(void* ctx);
+
+} // namespace c10::impl::cow

videochat2/lib/python3.10/site-packages/torch/include/c10/core/impl/DeviceGuardImplInterface.h

@@ -0,0 +1,365 @@
+#pragma once
+
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/core/Stream.h>
+#include <c10/util/Exception.h>
+
+// Just for C10_ANONYMOUS_VARIABLE
+#include <c10/util/Registry.h>
+
+#include <atomic>
+
+namespace c10 {
+
+// Forward declaration
+class DataPtr;
+
+/**
+ * Note [Flags defining the behavior of events]
+ *
+ * PYTORCH_DEFAULT and BACKEND_DEFAULT are valid for all backends. The
+ * BACKEND_DEFAULT is what a particular backend would select if no
+ * flags were given. PYTORCH_DEFAULT is the PyTorch's framework default
+ * choice for events on that backend, which may not be the same.
+ *
+ * The mapping of PYTORCH_DEFAULT and BACKEND_DEFAULT is done by each
+ * backend implementation.
+ */
+enum class EventFlag {
+  // Disable timing
+  PYTORCH_DEFAULT,
+  // Enable timing
+  BACKEND_DEFAULT,
+  // FOR TESTING ONLY
+  INVALID
+};
+
+namespace impl {
+
+/**
+ * DeviceGuardImplInterface represents the virtual interface which provides
+ * functionality to provide an RAII class for device and stream switching,
+ * via DeviceGuard.  Every distinct device type, e.g., CUDA and HIP, is
+ * expected to implement and register an implementation of this interface.
+ * All classes which inherit from DeviceGuardImplInterface should be declared
+ * 'final'.
+ *
+ * This class exists because we provide a unified interface for performing
+ * device guards via DeviceGuard, but we cannot assume that we have actually
+ * compiled against the, e.g., CUDA library, which actually implements
+ * this guard functionality.  In this case, a dynamic dispatch is required
+ * to cross the library boundary.
+ *
+ * If possible, you should directly use implementations of this interface;
+ * those uses will be devirtualized.
+ */
+struct C10_API DeviceGuardImplInterface {
+  DeviceGuardImplInterface() = default;
+  DeviceGuardImplInterface(const DeviceGuardImplInterface&) = default;
+  DeviceGuardImplInterface& operator=(const DeviceGuardImplInterface&) =
+      default;
+  DeviceGuardImplInterface(DeviceGuardImplInterface&&) noexcept = default;
+  DeviceGuardImplInterface& operator=(DeviceGuardImplInterface&&) noexcept =
+      default;
+
+  /**
+   * Return the type of device managed by this guard implementation.
+   */
+  virtual DeviceType type() const = 0;
+
+  /**
+   * Set the current device to Device, and return the previous Device.
+   */
+  virtual Device exchangeDevice(Device) const = 0;
+  // NB: Implementations of exchangeDevice can be a bit boilerplatey.  You might
+  // consider replacing exchangeDevice with a non-virtual function with a baked
+  // in implementation; however, note that this will triple the number of
+  // virtual calls (when you implement exchangeDevice in a final subclass,
+  // the compiler gets to devirtualize everything; it won't do that if you don't
+  // define it in the subclass!)  A common way to solve this problem is to use
+  // some sort of CRTP; however, we can template DeviceGuardImplInterface since
+  // we really *do* need it to be virtual.  A little boilerplate seems easiest
+  // to explain.  (Another way around this problem is to provide inline
+  // functions that provide the default implementations, but this seems a little
+  // hard to explain.  In any case, we're only going to have on order of ten
+  // implementations of this anyway.)
+
+  /**
+   * Get the current device.
+   */
+  virtual Device getDevice() const = 0;
+
+  /**
+   * Set the current device to Device.
+   */
+  virtual void setDevice(Device) const = 0;
+
+  /**
+   * Set the current device to Device, without checking for errors
+   * (so, e.g., this can be called from a destructor).
+   */
+  virtual void uncheckedSetDevice(Device) const noexcept = 0;
+
+  /**
+   * Get the current stream for a given device.
+   */
+  virtual Stream getStream(Device) const noexcept = 0;
+
+  /**
+   * Get the default stream for a given device.
+   */
+  virtual Stream getDefaultStream(Device) const {
+    TORCH_CHECK(false, "Backend doesn't support acquiring a default stream.")
+  }
+
+  /**
+   * Get a stream from the global pool for a given device.
+   */
+  virtual Stream getStreamFromGlobalPool(Device, bool isHighPriority = false)
+      const {
+    (void)isHighPriority; // Suppress unused variable warning
+    TORCH_CHECK(false, "Backend doesn't support acquiring a stream from pool.")
+  }
+
+  /**
+   * Return a new stream for a given device and priority. The stream will be
+   * copied and shared around, device backend should be able to correctly handle
+   * the lifetime of the stream.
+   */
+  virtual Stream getNewStream(Device, int priority = 0) const {
+    (void)priority;
+    TORCH_CHECK(false, "Backend doesn't support create a new Stream.")
+  }
+
+  /**
+   * Set a stream to be the thread local current stream for its device.
+   * Return the previous stream for that device. You are NOT required
+   * to set the current device to match the device of this stream.
+   */
+  virtual Stream exchangeStream(Stream) const noexcept = 0;
+
+  /**
+   * Destroys the given event.
+   */
+  virtual void destroyEvent(void* /*event*/, const DeviceIndex /*device_index*/)
+      const noexcept {}
+
+  /**
+   * Increments the event's version and enqueues a job with this version
+   * in the stream's work queue. When the stream process that job
+   * it notifies all streams waiting on / blocked by that version of the
+   * event to continue and marks that version as recorded.
+   * */
+  virtual void record(
+      void** /*event*/,
+      const Stream& /*stream*/,
+      const DeviceIndex /*device_index*/,
+      const c10::EventFlag /*flag*/) const {
+    TORCH_CHECK(false, "Backend doesn't support events.");
+  }
+
+  /**
+   * Does nothing if the event has not been scheduled to be recorded.
+   * If the event was previously enqueued to be recorded, a command
+   * to wait for the version of the event that exists at the time of this call
+   * is inserted in the stream's work queue.
+   * When the stream reaches this command it will stop processing
+   * additional commands until that version of the event is marked as recorded.
+   */
+  virtual void block(void* /*event*/, const Stream& /*stream*/) const {
+    TORCH_CHECK(false, "Backend doesn't support events.");
+  }
+
+  /**
+   * Returns true if (and only if)
+   *  (1) the event has never been scheduled to be recorded
+   *  (2) the current version is marked as recorded.
+   * Returns false otherwise.
+   */
+  virtual bool queryEvent(void* /*event*/) const {
+    TORCH_CHECK(false, "Backend doesn't support events.");
+  }
+
+  /**
+   * Get the number of devices.  WARNING: This is REQUIRED to not raise
+   * an exception.  If there is some sort of problem, e.g., driver error,
+   * you should report that there are zero available devices.
+   */
+  virtual DeviceIndex deviceCount() const noexcept = 0;
+
+  /**
+   * Return true if all the work previously enqueued on the stream for
+   * asynchronous execution has completed running on the device.
+   */
+  virtual bool queryStream(const Stream& /*stream*/) const {
+    TORCH_CHECK(false, "Backend doesn't support querying streams.");
+  }
+
+  /**
+   * Wait (by blocking the calling thread) until all the work previously
+   * enqueued on the stream has completed running on the device.
+   */
+  virtual void synchronizeStream(const Stream& /*stream*/) const {
+    TORCH_CHECK(false, "Backend doesn't support synchronizing streams.");
+  }
+
+  /**
+   * Wait (by blocking the calling thread) until all the work previously
+   * recorded on the event has completed running on the device.
+   */
+  virtual void synchronizeEvent(void* /*event*/) const {
+    TORCH_CHECK(false, "Backend doesn't support synchronizing events.");
+  }
+
+  /**
+   * Ensure the caching allocator (if any) is aware that the given DataPtr is
+   * being used on the given stream, and that it should thus avoid recycling the
+   * DataPtr until all work on that stream is done.
+   */
+  virtual void recordDataPtrOnStream(const c10::DataPtr&, const Stream&) const {
+  }
+
+  /**
+   * Fetch the elapsed time between two recorded events.
+   */
+  virtual double elapsedTime(
+      void* /*event1*/,
+      void* /*event2*/,
+      const DeviceIndex /*device_index*/) const {
+    TORCH_CHECK(false, "Backend doesn't support elapsedTime.");
+  }
+
+  /**
+   * Intended use of this class is to leak the DeviceGuardImpl at program end.
+   * So you better not call the destructor, buster!
+   */
+  virtual ~DeviceGuardImplInterface() = default;
+};
+
+// A no-op device guard impl that doesn't do anything interesting.  Useful
+// for devices that don't actually have a concept of device index.  Prominent
+// examples are CPU and Meta.
+template <DeviceType D>
+struct NoOpDeviceGuardImpl final : public DeviceGuardImplInterface {
+  NoOpDeviceGuardImpl() = default;
+  DeviceType type() const override {
+    return D;
+  }
+  Device exchangeDevice(Device) const override {
+    return Device(D, -1); // no-op
+  }
+  Device getDevice() const override {
+    return Device(D, -1);
+  }
+  void setDevice(Device) const override {
+    // no-op
+  }
+  void uncheckedSetDevice(Device) const noexcept override {
+    // no-op
+  }
+  Stream getStream(Device) const noexcept override {
+    // no-op
+    return Stream(Stream::DEFAULT, Device(D, -1));
+  }
+
+  Stream getNewStream(Device, int priority = 0) const override {
+    // no-op
+    (void)priority;
+    return Stream(Stream::DEFAULT, Device(D, -1));
+  }
+
+  // NB: These do NOT set the current device
+  Stream exchangeStream(Stream) const noexcept override {
+    // no-op
+    return Stream(Stream::DEFAULT, Device(D, -1));
+  }
+  DeviceIndex deviceCount() const noexcept override {
+    return 1;
+  }
+
+  // Event-related functions
+  void record(
+      void** /*event*/,
+      const Stream& /*stream*/,
+      const DeviceIndex /*device_index*/,
+      const EventFlag /*flag*/) const override {
+    TORCH_CHECK(false, D, " backend doesn't support events.");
+  }
+  void block(void* /*event*/, const Stream& /*stream*/) const override {
+    TORCH_CHECK(false, D, " backend doesn't support events.")
+  }
+  bool queryEvent(void* /*event*/) const override {
+    TORCH_CHECK(false, D, " backend doesn't support events.")
+  }
+  void destroyEvent(void* /*event*/, const DeviceIndex /*device_index*/)
+      const noexcept override {}
+
+  // Stream-related functions
+  bool queryStream(const Stream& /*stream*/) const override {
+    return true;
+  }
+  void synchronizeStream(const Stream& /*stream*/) const override {
+    // Don't wait for anything.
+  }
+};
+
+// The registry is NON-owning.  Each stored pointer is std::atomic so
+// that under all interleavings of registry calls the structure is
+// race-free.  This doesn't cost us anything on reads in X86.  (An
+// unsynchronized implementation probably is OK too, but I didn't want
+// to prove that we never read from device_guard_impl_registry at the
+// same time some registration is occurring.  Shiver.)
+//
+// I'd like this registry to be valid even at program destruction time
+// (in case someone uses a DeviceGuard in a destructor to do some cleanup
+// in the CUDA API.)  Since there are no direct accesses of the underlying
+// owning objects which I can use to enforce initialization order (unlike
+// in a Meyer singleton), it implies that you must *leak* objects when
+// putting them in the registry.  This is done by deleting the destructor
+// on DeviceGuardImplInterface.
+// NOLINTNEXTLINE(*c-arrays*)
+extern C10_API std::atomic<const DeviceGuardImplInterface*>
+    device_guard_impl_registry[static_cast<size_t>(
+        DeviceType::COMPILE_TIME_MAX_DEVICE_TYPES)];
+
+// I can't conveniently use c10/util/Registry.h for the following reason:
+// c10/util/Registry.h gives me a slow way of Create'ing a object of some
+// interface from the registry, but no way of quickly accessing an already
+// created object.  I'll be banging on getDeviceGuardImpl every time we do a
+// DeviceGuard, so I really don't want to be doing an unordered_map lookup.
+// Better if the registration mechanism directly drops its implementation
+// into device_guard_impl_registry.
+
+class C10_API DeviceGuardImplRegistrar {
+ public:
+  DeviceGuardImplRegistrar(DeviceType, const DeviceGuardImplInterface*);
+};
+
+#define C10_REGISTER_GUARD_IMPL(DevType, DeviceGuardImpl)              \
+  static ::c10::impl::DeviceGuardImplRegistrar C10_ANONYMOUS_VARIABLE( \
+      g_##DeviceType)(::c10::DeviceType::DevType, new DeviceGuardImpl());
+
+inline const DeviceGuardImplInterface* getDeviceGuardImpl(DeviceType type) {
+  // Two adjacent int16_t fields DeviceType and DeviceIndex has field access
+  // miscompiled on NVCC. To workaround this issue, we apply a mask to the
+  // DeviceType. First check if the DeviceType is 16-bit.
+  // FB employees can see
+  //   https://fb.workplace.com/groups/llvm.gcc/permalink/4053565044692080/
+  // for more details
+  static_assert(sizeof(DeviceType) == 1, "DeviceType is not 8-bit");
+  auto p = device_guard_impl_registry[static_cast<size_t>(type) & 0xFF].load();
+
+  // This seems to be the first place where you make use of a device
+  // when you pass devices to factory functions.  Give a nicer error
+  // message in this case.
+  TORCH_CHECK(p, "PyTorch is not linked with support for ", type, " devices");
+  return p;
+}
+
+inline bool hasDeviceGuardImpl(DeviceType type) {
+  return device_guard_impl_registry[static_cast<size_t>(type)].load();
+}
+
+} // namespace impl
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/core/impl/FakeGuardImpl.h

@@ -0,0 +1,102 @@
+#pragma once
+
+#include <c10/core/impl/DeviceGuardImplInterface.h>
+
+#include <array>
+
+namespace c10::impl {
+
+// FakeGuardImpl is hardcoded to have eight devices.  Not for
+// any good reason, just to simplify code.
+constexpr DeviceIndex kFakeGuardImplMaxDevices = 8;
+
+/**
+ * A fake implementation of DeviceGuardImplInterface suitable for testing.
+ * The current device is modeled as a mutable field in the guard implementation
+ * class.  See DeviceGuard_test.cpp for an example use.
+ */
+template <DeviceType T>
+struct FakeGuardImpl final : public DeviceGuardImplInterface {
+  static constexpr DeviceType static_type = T;
+  // Runtime device type is not used
+  FakeGuardImpl(DeviceType) {}
+  FakeGuardImpl() = default;
+  DeviceType type() const override {
+    return T;
+  }
+  Device exchangeDevice(Device d) const override {
+    AT_ASSERT(d.type() == type());
+    AT_ASSERT(d.index() < kFakeGuardImplMaxDevices);
+    Device old_device = getDevice();
+    if (old_device.index() != d.index()) {
+      current_device_ = d.index();
+    }
+    return old_device;
+  }
+  Device getDevice() const override {
+    return Device(type(), current_device_);
+  }
+  void setDevice(Device d) const override {
+    AT_ASSERT(d.type() == type());
+    AT_ASSERT(d.index() >= 0);
+    AT_ASSERT(d.index() < kFakeGuardImplMaxDevices);
+    current_device_ = d.index();
+  }
+  void uncheckedSetDevice(Device d) const noexcept override {
+    current_device_ = d.index();
+  }
+  Stream getStream(Device d) const noexcept override {
+    return Stream(Stream::UNSAFE, d, current_streams_[d.index()]);
+  }
+  Stream exchangeStream(Stream s) const noexcept override {
+    auto old_id = current_streams_[s.device_index()];
+    current_streams_[s.device_index()] = s.id();
+    return Stream(Stream::UNSAFE, s.device(), old_id);
+  }
+  DeviceIndex deviceCount() const noexcept override {
+    return kFakeGuardImplMaxDevices;
+  }
+
+  // Event-related functions
+  void record(
+      void** event,
+      const Stream& stream,
+      const DeviceIndex device_index,
+      const EventFlag flag) const override {}
+  void block(void* event, const Stream& stream) const override {}
+  bool queryEvent(void* event) const override {
+    return true;
+  }
+  void destroyEvent(void* event, const DeviceIndex device_index)
+      const noexcept override {}
+
+  // Convenience methods for testing
+  static DeviceIndex getDeviceIndex() {
+    return current_device_;
+  }
+  static void setDeviceIndex(DeviceIndex i) {
+    AT_ASSERT(i >= 0);
+    AT_ASSERT(i < kFakeGuardImplMaxDevices);
+    current_device_ = i;
+  }
+  static StreamId getCurrentStreamIdFor(DeviceIndex i) {
+    return current_streams_.at(i);
+  }
+  static void resetStreams() {
+    current_streams_.fill(0);
+  }
+
+ private:
+  thread_local static DeviceIndex current_device_;
+  thread_local static std::array<StreamId, kFakeGuardImplMaxDevices>
+      current_streams_;
+};
+
+template <DeviceType T>
+thread_local DeviceIndex FakeGuardImpl<T>::current_device_ = 0;
+
+template <DeviceType T>
+thread_local std::array<StreamId, kFakeGuardImplMaxDevices>
+    FakeGuardImpl<T>::current_streams_ = {0, 0, 0, 0, 0, 0, 0, 0};
+
+} // namespace c10::impl

videochat2/lib/python3.10/site-packages/torch/include/c10/core/impl/InlineDeviceGuard.h

@@ -0,0 +1,429 @@
+#pragma once
+
+// This file provides implementations of InlineDeviceGuard and
+// InlineOptionalDeviceGuard.
+
+#include <c10/core/Device.h>
+#include <c10/core/DeviceType.h>
+#include <c10/core/impl/DeviceGuardImplInterface.h>
+#include <c10/core/impl/VirtualGuardImpl.h>
+#include <c10/util/Exception.h>
+#include <c10/util/Optional.h>
+#include <type_traits>
+#include <utility>
+
+namespace c10::impl {
+
+/**
+ * A DeviceGuard is an RAII class that sets a device to some value
+ * on construction, and resets the device to its original value on
+ * destruction.
+ *
+ * InlineDeviceGuard is a helper class for implementing DeviceGuards.
+ * It is templated over a DeviceGuardImpl (anything that implements
+ * DeviceGuardImplInterface).  There are two primary ways to instantiate
+ * InlineDeviceGuard:
+ *
+ *  - With a concrete implementation of DeviceGuardImpl, e.g., CUDAGuardImpl.
+ *    This is the best way to use InlineDeviceGuard, as all calls are
+ *    devirtualized, giving you code as efficient as straight line
+ *    calls to cudaGetDevice/cudaSetDevice.
+ *
+ *  - With VirtualGuardImpl, which does a virtual dispatch to a DeviceGuardImpl
+ *    retrieved from a DeviceType registry.  We have explicitly instantiated
+ *    InlineDeviceGuard this way as c10::DeviceGuard.
+ *
+ * If you are in a hurry, you can use InlineDeviceGuard directly:
+ *
+ *    using CUDAGuard = impl::InlineDeviceGuard<CUDAGuardImpl>;
+ *
+ * However, you can provide a better user experience if you explicitly write a
+ * wrapper class that itself contains the template instantiation:
+ *
+ *    class CUDAGuard {
+ *    public:
+ *      // ... the API ...
+ *    private:
+ *      impl::InlineDeviceGuard<CUDAGuardImpl> guard_;
+ *    }
+ *
+ * The wrapper class provides a good place to write documentation, and helps
+ * avoid weird template instantiation errors when a user incorrectly uses the
+ * class.
+ *
+ * If you need to test this class, consider instantiating it with FakeGuardImpl.
+ */
+template <typename T>
+class InlineDeviceGuard {
+ public:
+  // Note [Omitted default constructor from RAII]
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  // In principle, we could add a default constructor to
+  // DeviceGuard which reads the current device and promises to
+  // restore to that device on exit.  However, most cases where you
+  // would have written this, you probably meant to actually just
+  // use OptionalDeviceGuard (since you don't actually need the
+  // restore to happen if you don't ever actually set the device).
+  // We remove the constructor here to encourage you to think about
+  // what you actually want to happen.
+  explicit InlineDeviceGuard() = delete;
+
+  /// Set the current device to the passed Device.
+  explicit InlineDeviceGuard(Device device)
+      : impl_(device.type()),
+        original_device_(
+            device.index() == -1 ? impl_.getDevice()
+                                 : impl_.exchangeDevice(device)),
+        current_device_(device.index() == -1 ? original_device_ : device) {}
+
+  /// Set the current device index to the passed DeviceIndex.  (The
+  /// device type is inferred from the template parameter T).
+  template <
+      typename U = T,
+      typename =
+          typename std::enable_if_t<!std::is_same_v<U, VirtualGuardImpl>>>
+  explicit InlineDeviceGuard(DeviceIndex device_index)
+      : InlineDeviceGuard(Device(U::static_type, device_index)) {}
+
+  /// Construct an InlineDeviceGuard using VirtualGuardImpl with an explicit
+  /// DeviceGuardImplInterface pointer.
+  template <
+      typename U = T,
+      typename = typename std::enable_if_t<std::is_same_v<U, VirtualGuardImpl>>>
+  explicit InlineDeviceGuard(
+      Device device,
+      const DeviceGuardImplInterface* impl)
+      : impl_(
+            VirtualGuardImpl(impl ? impl : getDeviceGuardImpl(device.type()))),
+        original_device_(
+            device.index() == -1 ? impl_.getDevice()
+                                 : impl_.exchangeDevice(device)),
+        current_device_(device.index() == -1 ? original_device_ : device) {}
+
+  /// Copy is disallowed
+  InlineDeviceGuard(const InlineDeviceGuard<T>&) = delete;
+  InlineDeviceGuard<T>& operator=(const InlineDeviceGuard<T>&) = delete;
+
+  /// Move is disallowed, as DeviceGuard does not have an uninitialized state,
+  /// which is required for moves on types with nontrivial destructors.
+  InlineDeviceGuard(InlineDeviceGuard<T>&& other) = delete;
+  InlineDeviceGuard& operator=(InlineDeviceGuard<T>&& other) = delete;
+
+  ~InlineDeviceGuard() {
+    impl_.uncheckedSetDevice(original_device_);
+  }
+
+  /// Sets the device to the given one.
+  template <
+      typename U = T,
+      typename std::enable_if_t<!std::is_same_v<U, VirtualGuardImpl>, int> = 0>
+  void set_device(at::Device device) {
+    AT_ASSERT(
+        (U::static_type == DeviceType::HIP && device.is_cuda()) ||
+        device.type() == U::static_type);
+    auto index = device.index();
+    if (index == -1)
+      return;
+    impl_.setDevice(device);
+    current_device_ = device;
+  }
+
+  /// Resets the currently set device to its original device, and then sets the
+  /// current device to the passed device.  This is effectively equivalent to
+  /// set_device when a guard supports only a single device type.
+  template <typename U = T>
+  typename std::enable_if_t<!std::is_same_v<U, VirtualGuardImpl>> reset_device(
+      at::Device device) {
+    set_device(device);
+  }
+
+  /// Resets the currently set device to its original device, and then sets the
+  /// current device to the passed device (for a possibly different device
+  /// type).
+  ///
+  /// This method is named reset_device to highlight the fact that previous
+  /// device settings from this guard are NOT preserved, even if the device
+  /// has a different device type.  For example:
+  ///
+  ///   // CUDA device is 0
+  ///   DeviceGuard g(Device(kCUDA, 1));
+  ///   g.reset_device(Device(kHIP, 2));
+  ///   // CUDA device is 0 (!!)
+  ///
+  /// NOTE: this implementation may skip some device setting if it can prove
+  /// that it is unnecessary.
+  ///
+  /// Optional argument is for testing only.
+  template <typename U = T>
+  typename std::enable_if_t<std::is_same_v<U, VirtualGuardImpl>> reset_device(
+      at::Device device,
+      const impl::DeviceGuardImplInterface* impl = nullptr) {
+    auto index = device.index();
+    if (index == -1)
+      return;
+    if (device.type() == original_device_.type()) {
+      AT_ASSERT(impl == nullptr || impl->type() == device.type());
+      impl_.setDevice(device);
+      current_device_ = device;
+    } else {
+      // Destruct and reconstruct the DeviceGuard in place
+      impl_.setDevice(original_device_);
+      impl_ = !impl ? VirtualGuardImpl(device.type()) : VirtualGuardImpl(impl);
+      original_device_ = impl_.exchangeDevice(device);
+      current_device_ = device;
+    }
+  }
+
+  /// Sets the device index to the given one.  The device type is inferred
+  /// from the original device type.
+  void set_index(DeviceIndex index) {
+    reset_device(Device(original_device_.type(), index));
+  }
+
+  /// Returns the device that was set at the time the most recent
+  /// reset_device(), or otherwise the device at construction time.
+  Device original_device() const {
+    return original_device_;
+  }
+
+  /// Returns the most recent device that was set using this device guard,
+  /// either from construction, or via set_device/reset_device/set_index.
+  Device current_device() const {
+    return current_device_;
+  }
+
+ protected:
+  T impl_;
+
+ private:
+  Device original_device_;
+  Device current_device_;
+};
+
+/**
+ * A OptionalDeviceGuard is an RAII class that sets a device to some value on
+ * initialization, and resets the device to its original value on destruction.
+ *
+ * InlineOptionalDeviceGuard is a helper class for implementing
+ * OptionalDeviceGuards.  See guidance in InlineDeviceGuard on how to
+ * use this.  See OptionalDeviceGuard for user-oriented usage notes.
+ */
+template <typename T>
+class InlineOptionalDeviceGuard {
+ public:
+  // Note [Explicit initialization of optional fields]
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  // Explicit initialization of optional fields
+  // required to workaround an nvcc bug; see
+  // https://github.com/pytorch/pytorch/issues/12117
+
+  /// Creates an uninitialized OptionalDeviceGuard.
+  explicit InlineOptionalDeviceGuard()
+      : guard_() // See Note [Explicit initialization of optional fields]
+  {}
+
+  /// Set the current device to the passed Device, if it is not nullopt.
+  explicit InlineOptionalDeviceGuard(std::optional<Device> device_opt)
+      : guard_() { // See Note [Explicit initialization of optional fields]
+    if (device_opt.has_value()) {
+      guard_.emplace(device_opt.value());
+    }
+  }
+
+  /// Set the current device to the passed DeviceIndex, if it is not nullopt.
+  template <
+      typename U = T,
+      typename =
+          typename std::enable_if_t<!std::is_same_v<U, VirtualGuardImpl>>>
+  explicit InlineOptionalDeviceGuard(
+      std::optional<DeviceIndex> device_index_opt)
+      : guard_() { // See Note [Explicit initialization of optional fields]
+    if (device_index_opt.has_value()) {
+      guard_.emplace(device_index_opt.value());
+    }
+  }
+
+  /// All constructors of DeviceGuard are valid for OptionalDeviceGuard
+  /// and result in initialized OptionalDeviceGuard.
+  template <typename... Args>
+  explicit InlineOptionalDeviceGuard(Args&&... args)
+      : guard_(std::in_place, std::forward<Args>(args)...) {}
+
+  // TODO: Consider reading Tensor and TensorList constructors here, when
+  // Tensor moves to c10.  (These are only valid on OptionalDeviceGuard,
+  // because a Tensor may be undefined, in which case we need an uninitialized
+  // tensor guard.)
+
+  // Note [Move construction for RAII guards is tricky]
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  // In principle, move construction is useful for terminating
+  // the lifetime of a `OptionalDeviceGuard` early; for example:
+  //
+  //     // current device is d0
+  //     OptionalDeviceGuard g1(d1);
+  //     // current device is d1
+  //     {
+  //       OptionalDeviceGuard g2(std::move(g1));
+  //     }
+  //     // current device is d0!!
+  //
+  // However, it's difficult to implement the move constructor
+  // in a way that works in all situations.  For example, consider
+  // the following example:
+  //
+  //     OptionalDeviceGuard g1(d1);
+  //     {
+  //       OptionalDeviceGuard g2(d2);
+  //       {
+  //         OptionalDeviceGuard g3(std::move(g1)); // !!!
+  //       }
+  //     }
+  //
+  // What should the current device be while g3 in scope... and what
+  // should it be after it goes out of scope?  What about g2?
+  // There don't seem to be satisfactory answers for these questions.
+  //
+  // It's in principle possible to raise an error when this occurs
+  // by doing some extra thread-local bookkeeping.  But why bother?
+  // Just don't provide the constructor.
+  InlineOptionalDeviceGuard(InlineOptionalDeviceGuard<T>&& other) = delete;
+
+  // Note [Move assignment for RAII guards is tricky]
+  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  // Move assignment is deleted, because you need to know which guard was
+  // defined "first", as that guard's original_device_ wins--with the current
+  // representation, we have no way of telling which is the case.  (Move
+  // construction does not have this problem, as one guard is always
+  // uninitialized.)
+  //
+  // We can make this clear by way of a pair of examples:
+  //
+  // Example 1:
+  //
+  //  // initial device is n0
+  //  {
+  //    CUDAGuard g1(n1);
+  //    {
+  //      CUDAGuard g2(n2);
+  //      // current device should be n2
+  //      g1 = std::move(g2);
+  //      // current device should still be n2
+  //    }
+  //    // current device should still be n2
+  //  }
+  //  // current device should be n0
+  //
+  //  Example 2 (flip the order of the two guards):
+  //
+  //  // initial device is n0
+  //  {
+  //    CUDAGuard g2(n2);
+  //    {
+  //      CUDAGuard g1(n1);
+  //      // current device should be n1
+  //      g1 = std::move(g2);
+  //      // current device should be n2
+  //    }
+  //    // current device should be n0 (since g2 has been vacated)
+  //  }
+  //
+  // In both examples, we need g1 to restore to n0 after move assignment.
+  // However, in example 1, this is determined by the restore value of g1
+  // (prior to the move). In example 2, however, it is determined by the the
+  // restore value of g2(!!). We don't know which one should win, without having
+  // a way of telling which guard was allocated first.
+  //
+  // We could solve this with an extra thread-local variable.  But no one is
+  // actually using move-assignment.  So just get rid of it.
+  InlineOptionalDeviceGuard& operator=(InlineOptionalDeviceGuard&& other) =
+      delete;
+
+  /// Sets the device to the given one.  Initializes OptionalDeviceGuard if it
+  /// is not already initialized.
+  template <
+      typename U = T,
+      typename =
+          typename std::enable_if_t<!std::is_same_v<U, VirtualGuardImpl>>>
+  void set_device(at::Device device) {
+    if (!guard_.has_value()) {
+      guard_.emplace(device);
+    } else {
+      guard_->set_device(device);
+    }
+  }
+
+  /// Resets the currently set device to its original device, and then sets the
+  /// current device to the passed device (for a possibly different device
+  /// type).  Initializes OptionalDeviceGuard if it is not already initialized.
+  ///
+  /// See notes on why this is called reset_device on InlineDeviceGuard.
+  ///
+  /// Optional argument is for testing only.
+  template <
+      typename U = T,
+      typename = typename std::enable_if_t<std::is_same_v<U, VirtualGuardImpl>>>
+  void reset_device(
+      at::Device device,
+      const DeviceGuardImplInterface* impl = nullptr) {
+    if (!guard_.has_value()) {
+      guard_.emplace(device, impl);
+    } else {
+      guard_->reset_device(device, impl);
+    }
+  }
+
+  /// Resets the currently set device to its original device, and then sets the
+  /// current device to the passed device.  Initializes the guard if it is
+  /// not already initialized.  This is effectively equivalent to set_device
+  /// when a guard supports only a single device type.
+  template <
+      typename U = T,
+      typename =
+          typename std::enable_if_t<!std::is_same_v<U, VirtualGuardImpl>>>
+  void reset_device(at::Device device) {
+    if (!guard_.has_value()) {
+      guard_.emplace(device);
+    } else {
+      guard_->reset_device(device);
+    }
+  }
+
+  /// Sets the device index to the given one.  The device type is statically
+  /// known.
+  template <
+      typename U = T,
+      typename =
+          typename std::enable_if_t<!std::is_same_v<U, VirtualGuardImpl>>>
+  void set_index(DeviceIndex index) {
+    if (!guard_.has_value()) {
+      guard_.emplace(index);
+    } else {
+      guard_->set_index(index);
+    }
+  }
+
+  /// Returns the device that was set immediately prior to initialization of
+  /// the, guard, or nullopt if the guard is uninitialized.
+  std::optional<Device> original_device() const {
+    return guard_.has_value() ? std::make_optional(guard_->original_device())
+                              : std::nullopt;
+  }
+
+  /// Returns the most recent device that was set using this device guard,
+  /// either from construction, or via set_device, if the guard is initialized,
+  /// or nullopt if the guard is uninitialized.
+  std::optional<Device> current_device() const {
+    return guard_.has_value() ? std::make_optional(guard_->current_device())
+                              : std::nullopt;
+  }
+
+  /// Restore the original device, resetting this guard to uninitialized state.
+  void reset() {
+    guard_.reset();
+  }
+
+ private:
+  std::optional<InlineDeviceGuard<T>> guard_;
+};
+
+} // namespace c10::impl

videochat2/lib/python3.10/site-packages/torch/include/c10/core/impl/InlineEvent.h

@@ -0,0 +1,139 @@
+#pragma once
+
+#include <c10/core/DeviceType.h>
+#include <c10/core/Stream.h>
+#include <c10/core/impl/DeviceGuardImplInterface.h>
+#include <c10/util/Exception.h>
+
+namespace c10::impl {
+
+template <typename T>
+struct InlineEvent final {
+  InlineEvent() = delete;
+  InlineEvent(
+      const DeviceType _device_type,
+      const EventFlag _flag = EventFlag::PYTORCH_DEFAULT)
+      : backend_{_device_type}, device_type_{_device_type}, flag_{_flag} {}
+
+  // Copy constructor and copy assignment operator (deleted)
+  InlineEvent(const InlineEvent&) = delete;
+  InlineEvent& operator=(const InlineEvent&) = delete;
+
+  // Move constructor and move assignment operator
+  InlineEvent(InlineEvent&& other) noexcept
+      : event_(other.event_),
+        backend_(std::move(other.backend_)),
+        device_type_(other.device_type_),
+        device_index_(other.device_index_),
+        flag_(other.flag_),
+        was_marked_for_recording_(other.was_marked_for_recording_) {
+    other.event_ = nullptr;
+  }
+  InlineEvent& operator=(InlineEvent&& other) noexcept {
+    swap(other);
+    return *this;
+  }
+
+  void swap(InlineEvent& other) noexcept {
+    std::swap(event_, other.event_);
+    std::swap(backend_, other.backend_);
+    std::swap(device_type_, other.device_type_);
+    std::swap(device_index_, other.device_index_);
+    std::swap(flag_, other.flag_);
+    std::swap(was_marked_for_recording_, other.was_marked_for_recording_);
+  }
+
+  ~InlineEvent() noexcept {
+    if (event_)
+      backend_.destroyEvent(event_, device_index_);
+  }
+
+  DeviceType device_type() const noexcept {
+    return device_type_;
+  }
+  DeviceIndex device_index() const noexcept {
+    return device_index_;
+  }
+  EventFlag flag() const noexcept {
+    return flag_;
+  }
+  bool was_marked_for_recording() const noexcept {
+    return was_marked_for_recording_;
+  }
+
+  void recordOnce(const Stream& stream) {
+    if (!was_marked_for_recording_)
+      record(stream);
+  }
+
+  void record(const Stream& stream) {
+    TORCH_CHECK(
+        stream.device_type() == device_type_,
+        "Event device type ",
+        DeviceTypeName(device_type_),
+        " does not match recording stream's device type ",
+        DeviceTypeName(stream.device_type()),
+        ".");
+
+    backend_.record(&event_, stream, device_index_, flag_);
+    was_marked_for_recording_ = true;
+    device_index_ = stream.device_index();
+  }
+
+  void block(const Stream& stream) const {
+    if (!was_marked_for_recording_)
+      return;
+
+    TORCH_CHECK(
+        stream.device_type() == device_type_,
+        "Event device type ",
+        DeviceTypeName(device_type_),
+        " does not match blocking stream's device type ",
+        DeviceTypeName(stream.device_type()),
+        ".");
+
+    backend_.block(event_, stream);
+  }
+
+  bool query() const {
+    if (!was_marked_for_recording_)
+      return true;
+    return backend_.queryEvent(event_);
+  }
+
+  void* eventId() const {
+    return event_;
+  }
+
+  double elapsedTime(const InlineEvent& other) const {
+    TORCH_CHECK(
+        other.was_marked_for_recording(),
+        "other was not marked for recording.");
+    TORCH_CHECK(
+        was_marked_for_recording(), "self was not marked for recording.");
+    TORCH_CHECK(
+        other.device_type() == device_type_,
+        "Event device type ",
+        DeviceTypeName(device_type_),
+        " does not match other's device type ",
+        DeviceTypeName(other.device_type()),
+        ".");
+    return backend_.elapsedTime(event_, other.event_, device_index_);
+  }
+
+  void synchronize() const {
+    if (!was_marked_for_recording_)
+      return;
+    backend_.synchronizeEvent(event_);
+  }
+
+ private:
+  void* event_ = nullptr;
+  T backend_;
+  DeviceType device_type_;
+  DeviceIndex device_index_ = -1;
+  EventFlag flag_ = EventFlag::PYTORCH_DEFAULT;
+  bool was_marked_for_recording_ = false;
+};
+
+} // namespace c10::impl

videochat2/lib/python3.10/site-packages/torch/include/c10/core/impl/PyInterpreter.h

@@ -0,0 +1,263 @@
+#pragma once
+
+#include <c10/core/Device.h>
+#include <c10/core/DispatchKeySet.h>
+#include <c10/core/Layout.h>
+#include <c10/core/MemoryFormat.h>
+#include <c10/core/SymIntArrayRef.h>
+#include <c10/macros/Export.h>
+#include <c10/util/ArrayRef.h>
+#include <c10/util/intrusive_ptr.h>
+#include <c10/util/python_stub.h>
+#include <string>
+#include <vector>
+
+// Forward declarations
+
+namespace c10 {
+struct IValue;
+class OperatorHandle;
+struct TensorImpl;
+} // namespace c10
+
+namespace torch::jit {
+using Stack = std::vector<c10::IValue>;
+}
+
+// Actual implementation
+
+namespace c10::impl {
+
+struct C10_API PyInterpreter;
+
+// Note [Python interpreter tag]
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Traditionally, PyTorch is layered such that our Python library
+// (libtorch_python) references our pure C++ library (libtorch) as the
+// natural order of things.  However, sometimes this natural order is
+// subverted: C++ objects refer to Python objects (for example, we
+// store a PyObject* pointer on TensorImpl so that converting from a
+// C++ Tensor to a Python Tensor is just a memory dereference).
+//
+// These unusual orderings must be treated with care.  To start, you need to
+// virtualize the destructor so that the PyObject can be decref'ed on
+// destruction (because the C++ object itself doesn't know anything about
+// Python--remember, layering!).  This process itself is fraught, since
+// acquiring the GIL could lead to deadlocks if someone is blocking on you
+// while holding the GIL.  Furthermore, if the C++ objects outlive the
+// interpreter (which can happen if you stash them in a static global
+// variable defined in libtorch), you may attempt to decref the object when
+// the Python interpreter has already been shutdown.
+//
+// BUT WAIT, IT GETS WORSE.  With torchdeploy, there may be multiple Python
+// interpreters in a single process. If a C++ object is accessible from
+// multiple interpreters, we must take care not to accidentally pass a
+// PyObject from one interpreter with another interpreter.
+//
+// To prevent these mixups, we introduce a PyInterpreter "tag" (object with
+// a vtable), which specifies a specific Python interpreter.
+//
+//  - Any given object can be associated with AT MOST one Python interpreter.
+//    We represent the interpreter tag as a memory address to an instance of
+//    a virtual class that is allocated once per interpreter (this is so that
+//    we can request the interpreter to perform operations for us, if
+//    necessary).
+//
+//  - It can be recorded with a PyObject (PyInterpreterObject) so that
+//    we know what interpreter the object is associated with, and we can
+//    raise an error if you try to use the PyObject from the wrong
+//    interpreter context.
+//
+//  - It contains a vtable that can be used to perform various Python
+//    operations from ordinary C++ code that ordinarily wouldn't be accessible
+//    from libtorch.
+//
+// A simple use case is when a C++ object must be associated with a PyObject.
+// However, for TensorImpl, we lazily allocate a PyObject the first time the
+// object passes into Python.  The invariants for this situation are more
+// subtle:
+//
+//  - A given TensorImpl's interpreter tag can only go from uninitialized to
+//    tagged; once tagged, this is a quiescent state (once tagged to an
+//    interpreter, ALWAYS tagged to that interpreter)
+//
+//  - A thread may mutate the PyObject field of a TensorImpl if and only if it
+//    holds the GIL for the interpreter tagged on the TensorImpl.  (If the
+//    TensorImpl is not tagged, it must first atomically claim its tag before it
+//    can validly write)
+//
+// WARNING: This class has to be written very carefully, because it may be
+// possible for a Tensor to have a reference an interpreter corresponding to
+// a shared library that has ALREADY BEEN UNLOADED.  This makes blindly calling
+// virtual methods very dangerous, because the vtable may be garbage at that
+// point (on a good day, you might get "pure virtual method called").
+//
+// The idea to solve this problem is we always leak PyInterpreters (so they
+// always stay live even after dlclose), and make sure we can disarm their
+// virtual methods by indirecting through a separate PyInterpreterVTable
+// object.  This can be replaced with a no-op vtable from libc10.so, which
+// is guaranteed to stick around until the bitter end.
+//
+// NB: The downside with representing PyInterpreter tags as full objects is that
+// it takes an extra word on TensorImpl.  If tags were instead just integer
+// indices, on 64-bit architectures we could pack the tag and PyObject together
+// into a single atomic word.  On 32-bit architectures we could simply say that
+// only one Python interpreter is supported (erroring if a nontrivial
+// interpreter tag is attempted to be set).
+//
+// The difficulty with this scheme is we need to maintain an out-of-line table
+// to get at the PyInterpreters so that we can do virtual method calls on them,
+// and registration/deregistration to this table must be done in a thread safe
+// manner.  This can be easily done if the number of possible PyInterpreters is
+// small enough (e.g., 8-bit integer) by simply preallocating an array of
+// sufficient size to hold all possible interpreters.  Surely 128 threads is
+// more than enough for anyone!
+//
+// I didn't decide to do this technique at the moment, because the extra word
+// added by the PyInterpreter tag takes us to 24 words, which means that we
+// still fit inside three eight word cache lines.  If you need to penny pinch
+// another word consider doing this!
+
+struct C10_API PyInterpreterVTable {
+  virtual ~PyInterpreterVTable() = default;
+
+  // Report the name of this interpreter
+  virtual std::string name() const = 0;
+
+  // Run Py_INCREF on a PyObject.
+  virtual void incref(PyObject* pyobj) const = 0;
+  // Run Py_DECREF on a PyObject.  We DO NOT assume the GIL is held on call
+  // See NOTE [PyInterpreter::decref takes a `has_pyobj_slot` arg]
+  virtual void decref(PyObject* pyobj, bool has_pyobj_slot) const = 0;
+
+  // Perform a detach by deferring to the __torch_dispatch__ implementation of
+  // detach, which will also arrange for the PyObject to get copied in this
+  // situation
+  virtual c10::intrusive_ptr<TensorImpl> detach(
+      const TensorImpl* self) const = 0;
+
+  // Invoke the Python boxed fallback dispatch to go back into Python
+  virtual void dispatch(const c10::OperatorHandle& op, torch::jit::Stack* stack)
+      const = 0;
+
+  virtual void reportErrorCallback(PyObject* callback, DispatchKey key)
+      const = 0;
+
+  // This is only invoked in the multipy/torchdeploy situation from
+  // pythonOpRegistrationTrampoline; this lets us get to the Python
+  // interpreter to actually find the appropriate Python op registration
+  // entry to call.
+  virtual void python_op_registration_trampoline(
+      const c10::OperatorHandle& op,
+      c10::DispatchKey,
+      c10::DispatchKeySet keyset,
+      torch::jit::Stack* stack,
+      bool with_keyset,
+      bool with_op) const = 0;
+
+  virtual void throw_abstract_impl_not_imported_error(
+      std::string opname,
+      const char* pymodule,
+      const char* context) const = 0;
+
+  // Invoke the Python dispatcher to handle this call
+  virtual void python_dispatcher(
+      const c10::OperatorHandle& op,
+      c10::DispatchKeySet,
+      torch::jit::Stack* stack) const = 0;
+
+  virtual bool is_contiguous(const TensorImpl* self, at::MemoryFormat)
+      const = 0;
+  virtual bool is_strides_like(const TensorImpl* self, at::MemoryFormat)
+      const = 0;
+  virtual bool is_non_overlapping_and_dense(const TensorImpl* self) const = 0;
+  virtual c10::Device device(const TensorImpl* self) const = 0;
+  virtual int64_t dim(const TensorImpl* self) const = 0;
+  virtual c10::IntArrayRef strides(const TensorImpl* self) const = 0;
+  virtual c10::IntArrayRef sizes(const TensorImpl* self) const = 0;
+  virtual c10::SymIntArrayRef sym_sizes(const TensorImpl* self) const = 0;
+  virtual c10::Layout layout(const TensorImpl* self) const = 0;
+  virtual int64_t numel(const TensorImpl* self) const = 0;
+  virtual c10::SymInt sym_numel(const TensorImpl* self) const = 0;
+  virtual c10::SymIntArrayRef sym_strides(const TensorImpl* self) const = 0;
+  virtual c10::SymInt sym_storage_offset(const TensorImpl* self) const = 0;
+
+  virtual void trace_gpu_event_creation(
+      c10::DeviceType device_type,
+      uintptr_t event) const = 0;
+  virtual void trace_gpu_event_deletion(
+      c10::DeviceType device_type,
+      uintptr_t event) const = 0;
+  virtual void trace_gpu_event_record(
+      c10::DeviceType device_type,
+      uintptr_t event,
+      uintptr_t stream) const = 0;
+  virtual void trace_gpu_event_wait(
+      c10::DeviceType device_type,
+      uintptr_t event,
+      uintptr_t stream) const = 0;
+  virtual void trace_gpu_memory_allocation(
+      c10::DeviceType device_type,
+      uintptr_t ptr) const = 0;
+  virtual void trace_gpu_memory_deallocation(
+      c10::DeviceType device_type,
+      uintptr_t ptr) const = 0;
+  virtual void trace_gpu_stream_creation(
+      c10::DeviceType device_type,
+      uintptr_t stream) const = 0;
+  virtual void trace_gpu_device_synchronization(
+      c10::DeviceType device_type) const = 0;
+  virtual void trace_gpu_stream_synchronization(
+      c10::DeviceType device_type,
+      uintptr_t stream) const = 0;
+  virtual void trace_gpu_event_synchronization(
+      c10::DeviceType device_type,
+      uintptr_t event) const = 0;
+
+  virtual void reset_backward_hooks(const TensorImpl* self) const = 0;
+};
+
+struct C10_API PyInterpreter {
+  const PyInterpreterVTable* vtable_;
+
+  PyInterpreter(const PyInterpreterVTable* vtable) : vtable_(vtable){};
+
+  const PyInterpreterVTable& operator*() const noexcept {
+    return *vtable_;
+  }
+  const PyInterpreterVTable* operator->() const noexcept {
+    return vtable_;
+  }
+
+  // Disarm this PyInterpreter, making all of its methods noops.
+  // The vtable pointer is not an atomic at the moment, which means
+  // a disarm() invocation that is concurrent with active destructors
+  // is not thread safe and will trigger TSAN.  My hope is that this
+  // situations doesn't ever actually happen; tensor destruction should
+  // quiesce when a dlclose happens, and any long lived tensors whose
+  // destructors would be disarmed here only begin the destruction process
+  // on process shutdown (long after the dlclose has occurred).
+  void disarm() noexcept;
+};
+
+// PyInterpreterStatus describes what the state of its interpreter tag
+// is, relative to the thread currently holding the GIL.
+enum class PyInterpreterStatus {
+  // We just allocated the Tensor, it hasn't escaped to other threads,
+  // we know that it definitely hasn't been tagged to be associated
+  // with an interpreter.
+  DEFINITELY_UNINITIALIZED,
+  // We queried the interpreter field and it looked uninitialized.  But
+  // another thread may have raced with us to tag it with some other
+  // interpreter id.  So we will have to do a CEX to make sure we can
+  // actually nab it.
+  MAYBE_UNINITIALIZED,
+  // We queried the interpreter field and it was tagged to belong to us.
+  // This means we have sole write access (as we hold the GIL for this
+  // interpreter)
+  TAGGED_BY_US,
+  // Someone else tagged this.  We can't use this TensorImpl from Python.
+  TAGGED_BY_OTHER,
+};
+
+} // namespace c10::impl

videochat2/lib/python3.10/site-packages/torch/include/c10/core/impl/TorchDispatchModeTLS.h

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <c10/core/SafePyObject.h>
+#include <c10/macros/Export.h>
+
+namespace c10::impl {
+
+enum class TorchDispatchModeKey : int8_t {
+  FAKE,
+  PROXY,
+  FUNCTIONAL,
+  NUM_MODE_KEYS
+};
+
+using PyObject_TorchDispatchMode = SafePyObjectT<TorchDispatchModeKey>;
+
+struct C10_API TorchDispatchModeTLS {
+  // This API is NOT invariant safe.
+  // It must not take in an infra mode that uses TorchDispatchModeKey
+  // If you're pushing an infra mode onto the stack, we expect
+  // you to use set_mode
+  static void push_non_infra_mode_onto_stack(
+      std::shared_ptr<PyObject_TorchDispatchMode> mode);
+  // Pops the top mode of the stack,
+  // giving precedence to user modes before attempting to pop
+  // any infra modes
+  static const std::shared_ptr<PyObject_TorchDispatchMode> pop_stack();
+  // Returns the highest-priority infra mode on the stack,
+  // along with its mode key.
+  static const std::
+      tuple<std::shared_ptr<PyObject_TorchDispatchMode>, TorchDispatchModeKey>
+      pop_highest_infra_mode();
+
+  static const std::shared_ptr<PyObject_TorchDispatchMode>& get_stack_at(
+      int64_t idx);
+  static int64_t stack_len();
+
+  static const std::optional<std::shared_ptr<PyObject_TorchDispatchMode>>
+  get_mode(TorchDispatchModeKey mode_key);
+  static const std::optional<std::shared_ptr<PyObject_TorchDispatchMode>>
+  unset_mode(TorchDispatchModeKey mode_key);
+  static void set_mode(
+      const std::shared_ptr<PyObject_TorchDispatchMode>& mode,
+      TorchDispatchModeKey mode_key);
+
+  static const TorchDispatchModeTLS& get_state();
+  static void set_state(TorchDispatchModeTLS state);
+
+  static bool any_modes_set(bool skip_infra_modes = false);
+
+ private:
+  std::vector<std::shared_ptr<PyObject_TorchDispatchMode>> stack_;
+  // Users are allowed to push multiple ProxyTorchDispatchMode objects onto the
+  // stack
+  // However, we only allow a single FakeTensorMode onto the stack at a time
+  // (Pushing additional FakeTensorModes onto the stack is a no-op)
+  std::array<
+      std::optional<std::shared_ptr<PyObject_TorchDispatchMode>>,
+      static_cast<size_t>(TorchDispatchModeKey::NUM_MODE_KEYS)>
+      infra_modes_;
+};
+
+C10_API bool dispatch_mode_enabled();
+
+C10_API std::string to_string(TorchDispatchModeKey mode_key);
+
+} // namespace c10::impl