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@@ -913,3 +913,4 @@ videollama2/lib/python3.10/site-packages/nvidia/nccl/lib/libnccl.so.2 filter=lfs
 videochat2/lib/python3.10/site-packages/torch/_inductor/__pycache__/lowering.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text
 videochat2/lib/python3.10/site-packages/torch/_inductor/__pycache__/ir.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text
 videochat2/lib/python3.10/site-packages/torch/lib/libc10_cuda.so filter=lfs diff=lfs merge=lfs -text
+videochat2/lib/python3.10/site-packages/torch/fx/experimental/__pycache__/symbolic_shapes.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text

videochat2/lib/python3.10/site-packages/torch/ao/quantization/backend_config/_qnnpack_pt2e.py

@@ -0,0 +1,182 @@
+# mypy: allow-untyped-defs
+import operator
+
+import torch
+from torch.ao.quantization.backend_config import (
+    BackendConfig,
+    BackendPatternConfig,
+    DTypeConfig,
+    ObservationType,
+)
+
+
+weighted_op_quint8_dtype_config = DTypeConfig(
+    input_dtype=torch.quint8,
+    output_dtype=torch.quint8,
+    weight_dtype=torch.qint8,
+    bias_dtype=torch.float,
+)
+from typing import List
+
+
+def get_linear_configs():
+    linear_configs = []
+    observation_type = ObservationType.OUTPUT_USE_DIFFERENT_OBSERVER_AS_INPUT
+    dtype_configs = [weighted_op_quint8_dtype_config]
+
+    # TODO: need to fix the way we insert observers for this pattern
+    # should be solved in the new fusion API
+    # reason that this doesn't work: the pattern is a bit complicated and we don't
+    # have a way to specify which input of the pattern we would like to observe
+    # pattern:
+    # bias input weight
+    # \     |    /
+    #  \    |   t
+    #   \   |  /
+    #    addmm
+    # we want to observe "weight" as weight, but there is not way to convey this
+    # information with current pattern language
+    #
+    # right now:
+    # original:
+    #         weight - t \
+    #         input  - addmm
+    # observed (no hack):
+    #      weight - t - observer \
+    #       input - observer - addmm
+    # target:
+    #      weight - observer - t \
+    #        input - observer - addmm
+
+    # def root_node_getter(node_pattern):
+    #     addmm, bias, act, weight = node_pattern
+    #     return addmm
+
+    # linear_configs.append(
+    #     BackendPatternConfig((torch.ops.aten.addmm.default, MatchAllNode, MatchAllNode, torch.ops.aten.t.default))
+    #     .set_observation_type(observation_type)  # noqa: E131
+    #     .set_dtype_configs(dtype_configs)
+    #     ._set_root_node_getter(root_node_getter))
+
+    linear_configs.append(
+        BackendPatternConfig(torch.ops.aten.addmm.default)
+        .set_observation_type(observation_type)  # noqa: E131
+        .set_dtype_configs(dtype_configs)
+        ._set_input_type_to_index({"weight": 2, "bias": 0})
+    )
+    # linear is decomposed to `t - mm` if bias is not present
+    linear_configs.append(
+        BackendPatternConfig(torch.ops.aten.mm.default)
+        .set_observation_type(observation_type)  # noqa: E131
+        .set_dtype_configs(dtype_configs)
+        ._set_input_type_to_index({"weight": 1})
+    )
+    return linear_configs
+
+
+def get_conv_configs():
+    conv_configs = []
+    observation_type = ObservationType.OUTPUT_USE_DIFFERENT_OBSERVER_AS_INPUT
+    dtype_configs = [weighted_op_quint8_dtype_config]
+    conv_configs.append(
+        BackendPatternConfig(torch.ops.aten.convolution.default)
+        .set_observation_type(observation_type)  # noqa: E131
+        .set_dtype_configs(dtype_configs)
+        ._set_input_type_to_index({"weight": 1, "bias": 2})
+    )
+    conv_configs.append(
+        BackendPatternConfig(
+            (torch.ops.aten.convolution.default, torch.ops.aten.relu.default)
+        )
+        .set_observation_type(observation_type)  # noqa: E131
+        .set_dtype_configs(dtype_configs)
+        ._set_input_type_to_index({"weight": 1, "bias": 2})
+    )
+    # TODO: remove when functionalization is supported in PT2 mode
+    conv_configs.append(
+        BackendPatternConfig(
+            (torch.ops.aten.convolution.default, torch.ops.aten.relu_.default)
+        )
+        .set_observation_type(observation_type)  # noqa: E131
+        .set_dtype_configs(dtype_configs)
+        ._set_input_type_to_index({"weight": 1, "bias": 2})
+    )
+    return conv_configs
+
+
+def get_pooling_configs():
+    backend_pattern_configs = []
+    observation_type = ObservationType.OUTPUT_SHARE_OBSERVER_WITH_INPUT
+    dtype_configs = [weighted_op_quint8_dtype_config]
+
+    def root_node_getter(node_pattern):
+        getitem, maxpool, index = node_pattern
+        return maxpool
+
+    backend_pattern_configs.append(
+        BackendPatternConfig()
+        ._set_pattern_complex_format(
+            (operator.getitem, torch.ops.aten.max_pool2d_with_indices.default, 0)
+        )
+        .set_observation_type(observation_type)  # noqa: E131
+        .set_dtype_configs(dtype_configs)
+        ._set_root_node_getter(root_node_getter)
+    )
+
+    return backend_pattern_configs
+
+
+def get_relu_configs():
+    backend_pattern_configs = []
+    observation_type = ObservationType.OUTPUT_SHARE_OBSERVER_WITH_INPUT
+    dtype_configs = [weighted_op_quint8_dtype_config]
+    backend_pattern_configs.append(
+        BackendPatternConfig(torch.ops.aten.relu.default)
+        .set_observation_type(observation_type)  # noqa: E131
+        .set_dtype_configs(dtype_configs)
+    )
+    return backend_pattern_configs
+
+
+def get_binary_op_configs():
+    binary_op_configs: List[BackendPatternConfig] = []
+    dtype_configs = [weighted_op_quint8_dtype_config]
+    num_tensor_args_to_observation_type_mapping = {
+        # TODO: this is not used right now since we have extra check in prepare
+        # will need to change this to NO_OBSERVER later after we implemented
+        # Tensor dtype inference properly
+        0: ObservationType.OUTPUT_USE_DIFFERENT_OBSERVER_AS_INPUT,
+        1: ObservationType.OUTPUT_SHARE_OBSERVER_WITH_INPUT,
+        2: ObservationType.OUTPUT_USE_DIFFERENT_OBSERVER_AS_INPUT,
+    }
+    for op_with_quantized_bop_scalar_variant in [
+        torch.ops.aten.add.Tensor,
+        torch.ops.aten.add_.Tensor,
+    ]:
+        bop_patterns = [
+            (op_with_quantized_bop_scalar_variant, torch.ops.aten.relu.default),
+            op_with_quantized_bop_scalar_variant,
+            # TODO: remove when functionalization is supported in pt2_mode
+            (op_with_quantized_bop_scalar_variant, torch.ops.aten.relu_.default),
+        ]
+        for bop_pattern in bop_patterns:
+            binary_op_configs.append(
+                BackendPatternConfig(bop_pattern)
+                .set_dtype_configs(dtype_configs)  # noqa: E131
+                ._set_num_tensor_args_to_observation_type(
+                    num_tensor_args_to_observation_type_mapping
+                )
+            )
+
+    return binary_op_configs
+
+
+def get_qnnpack_pt2e_backend_config():
+    return (
+        BackendConfig("qnnpack_pytorch_2.0_export")
+        .set_backend_pattern_configs(get_linear_configs())
+        .set_backend_pattern_configs(get_binary_op_configs())
+        .set_backend_pattern_configs(get_conv_configs())
+        .set_backend_pattern_configs(get_pooling_configs())
+        .set_backend_pattern_configs(get_relu_configs())
+    )

videochat2/lib/python3.10/site-packages/torch/ao/quantization/backend_config/qnnpack.py

@@ -0,0 +1,171 @@
+import torch
+
+from ._common_operator_config_utils import (
+    _get_binary_op_configs,
+    _get_bn_configs,
+    _get_cat_config,
+    _get_conv_configs,
+    _get_default_op_configs,
+    _get_embedding_op_configs,
+    _get_fixed_qparams_op_configs,
+    _get_linear_configs,
+    _get_rnn_op_configs,
+    _get_share_qparams_op_configs,
+)
+from .backend_config import BackendConfig, DTypeConfig, DTypeWithConstraints
+
+
+__all__ = [
+    "get_qnnpack_backend_config",
+]
+
+# ===================
+# |  DTYPE CONFIGS  |
+# ===================
+
+qnnpack_weighted_op_quint8_dtype_config = DTypeConfig(
+    input_dtype=torch.quint8,
+    output_dtype=torch.quint8,
+    weight_dtype=torch.qint8,
+    bias_dtype=torch.float,
+)
+
+qnnpack_default_op_quint8_dtype_config = DTypeConfig(
+    input_dtype=torch.quint8,
+    output_dtype=torch.quint8,
+)
+
+qnnpack_default_op_fp16_dtype_config = DTypeConfig(
+    input_dtype=torch.float16,
+    output_dtype=torch.float16,
+    weight_dtype=torch.float16,
+    bias_dtype=torch.float16,
+)
+
+qnnpack_default_dynamic_int8_dtype_config = DTypeConfig(
+    input_dtype=torch.quint8,
+    output_dtype=torch.float,
+    weight_dtype=torch.qint8,
+    bias_dtype=torch.float,
+    is_dynamic=True,
+)
+
+qnnpack_default_dynamic_float16_dtype_config = DTypeConfig(
+    input_dtype=torch.float16,
+    output_dtype=torch.float,
+    weight_dtype=torch.float16,
+    bias_dtype=torch.float,
+    is_dynamic=True,
+)
+
+qnnpack_weight_only_quint8_dtype_config = DTypeConfig(
+    input_dtype=torch.float,
+    output_dtype=torch.float,
+    weight_dtype=torch.quint8,
+)
+
+qnnpack_weight_only_quint4x2_dtype_config = DTypeConfig(
+    input_dtype=torch.float,
+    output_dtype=torch.float,
+    weight_dtype=torch.quint4x2,
+)
+
+# xnnpack compatible dtype configs
+
+# We restrict scale values to be 2 ** -12 to ensure the
+# requantization scale never falls below the xnnpack lower
+# threshold. Additionally, for qint8 weight, we restrict
+# the quantization values to [-127, +127], excluding -128.
+# For more detail, refer to the description of
+# `default_symmetric_qnnpack_qconfig`.
+
+# TODO: add additional restriction on qscheme to ensure it
+# is either per_tensor_symmetric or per_channel_symmetric
+
+qnnpack_act_qint8_scale_min_2_neg_12 = DTypeWithConstraints(
+    dtype=torch.qint8,
+    scale_min_lower_bound=2**-12,
+)
+
+qnnpack_weight_qint8_neg_127_to_127_scale_min_2_neg_12 = DTypeWithConstraints(
+    dtype=torch.qint8,
+    quant_min_lower_bound=-127,
+    quant_max_upper_bound=127,
+    scale_min_lower_bound=2**-12,
+)
+
+qnnpack_weighted_op_qint8_symmetric_dtype_config = DTypeConfig(
+    input_dtype=qnnpack_act_qint8_scale_min_2_neg_12,
+    output_dtype=qnnpack_act_qint8_scale_min_2_neg_12,
+    weight_dtype=qnnpack_weight_qint8_neg_127_to_127_scale_min_2_neg_12,
+    bias_dtype=torch.float,
+)
+
+qnnpack_default_op_qint8_symmetric_dtype_config = DTypeConfig(
+    input_dtype=qnnpack_act_qint8_scale_min_2_neg_12,
+    output_dtype=qnnpack_act_qint8_scale_min_2_neg_12,
+)
+
+
+# =====================
+# |  BACKEND CONFIGS  |
+# =====================
+
+
+def get_qnnpack_backend_config() -> BackendConfig:
+    """
+    Return the `BackendConfig` for PyTorch's native QNNPACK backend.
+    """
+    conv_dtype_configs = [
+        qnnpack_weighted_op_qint8_symmetric_dtype_config,
+        qnnpack_weighted_op_quint8_dtype_config,
+    ]
+    linear_dtype_configs = [
+        qnnpack_weighted_op_qint8_symmetric_dtype_config,
+        qnnpack_weighted_op_quint8_dtype_config,
+        qnnpack_default_dynamic_int8_dtype_config,
+        qnnpack_default_dynamic_float16_dtype_config,
+    ]
+    binary_op_dtype_configs = [
+        qnnpack_default_op_qint8_symmetric_dtype_config,
+        qnnpack_default_op_quint8_dtype_config,
+    ]
+    default_op_dtype_configs = [
+        qnnpack_default_op_qint8_symmetric_dtype_config,
+        qnnpack_default_op_quint8_dtype_config,
+    ]
+    fixed_qparams_op_dtype_configs = [
+        qnnpack_default_op_qint8_symmetric_dtype_config,
+        qnnpack_default_op_quint8_dtype_config,
+    ]
+    share_qparams_op_dtype_configs = [
+        qnnpack_default_op_qint8_symmetric_dtype_config,
+        qnnpack_default_op_quint8_dtype_config,
+    ]
+    rnn_op_dtype_configs = [
+        qnnpack_default_dynamic_int8_dtype_config,
+        qnnpack_default_dynamic_float16_dtype_config,
+    ]
+    embedding_op_dtype_configs = [
+        qnnpack_weight_only_quint8_dtype_config,
+        qnnpack_weight_only_quint4x2_dtype_config,
+    ]
+    return (
+        BackendConfig("qnnpack")
+        .set_backend_pattern_configs(_get_conv_configs(conv_dtype_configs))
+        .set_backend_pattern_configs(_get_linear_configs(linear_dtype_configs))
+        .set_backend_pattern_configs(_get_binary_op_configs(binary_op_dtype_configs))
+        .set_backend_pattern_config(_get_cat_config(default_op_dtype_configs))
+        .set_backend_pattern_configs(_get_default_op_configs(default_op_dtype_configs))
+        .set_backend_pattern_configs(
+            _get_fixed_qparams_op_configs(fixed_qparams_op_dtype_configs)
+        )
+        .set_backend_pattern_configs(
+            _get_share_qparams_op_configs(share_qparams_op_dtype_configs)
+        )
+        .set_backend_pattern_configs(_get_bn_configs(default_op_dtype_configs))
+        .set_backend_pattern_configs(_get_rnn_op_configs(rnn_op_dtype_configs))
+        .set_backend_pattern_configs(
+            _get_embedding_op_configs(embedding_op_dtype_configs)
+        )
+    )

videochat2/lib/python3.10/site-packages/torch/ao/quantization/backend_config/tensorrt.py

@@ -0,0 +1,98 @@
+# mypy: allow-untyped-defs
+import torch
+
+from ._common_operator_config_utils import (
+    _get_binary_op_configs,
+    _get_conv_configs,
+    _get_linear_configs,
+    _get_share_qparams_op_configs,
+    _get_tensor_info_op_configs,
+)
+from .backend_config import (
+    BackendConfig,
+    BackendPatternConfig,
+    DTypeConfig,
+    ObservationType,
+)
+
+
+__all__ = [
+    "get_tensorrt_backend_config",
+    "get_tensorrt_backend_config_dict",
+]
+
+
+def get_tensorrt_backend_config() -> BackendConfig:
+    """
+    Return the `BackendConfig` for the TensorRT backend.
+    NOTE: Current api will change in the future, it's just to unblock experimentation for
+    new backends, please don't use it right now.
+    TODO: add a README when it's more stable
+    """
+    # dtype configs
+    weighted_op_qint8_dtype_config = DTypeConfig(
+        input_dtype=torch.qint8,
+        output_dtype=torch.qint8,
+        weight_dtype=torch.qint8,
+        bias_dtype=torch.float,
+    )
+    non_weighted_op_qint8_dtype_config = DTypeConfig(
+        input_dtype=torch.qint8,
+        output_dtype=torch.qint8,
+    )
+
+    addmm_config = (
+        BackendPatternConfig(torch.addmm)
+        .set_observation_type(ObservationType.OUTPUT_USE_DIFFERENT_OBSERVER_AS_INPUT)
+        .add_dtype_config(weighted_op_qint8_dtype_config)
+        ._set_input_type_to_index(
+            {
+                "bias": 0,
+                "input": 1,
+                "weight": 2,
+            }
+        )
+    )
+    cat_config = (
+        BackendPatternConfig(torch.cat)
+        .set_observation_type(ObservationType.OUTPUT_SHARE_OBSERVER_WITH_INPUT)
+        .add_dtype_config(non_weighted_op_qint8_dtype_config)
+    )
+    conv_dtype_configs = [
+        weighted_op_qint8_dtype_config,
+    ]
+    linear_dtype_configs = [
+        weighted_op_qint8_dtype_config,
+    ]
+    binary_op_dtype_configs = [
+        weighted_op_qint8_dtype_config,
+    ]
+    share_qparams_op_dtype_configs = [
+        non_weighted_op_qint8_dtype_config,
+    ]
+    tensor_info_op_dtype_configs = [
+        non_weighted_op_qint8_dtype_config,
+    ]
+    # there might be things not supported in fx2trt, but it will error out
+    # during fx2trt conversion and can support them after that
+    return (
+        BackendConfig("tensorrt")
+        .set_backend_pattern_configs(_get_conv_configs(conv_dtype_configs))
+        .set_backend_pattern_config(addmm_config)
+        .set_backend_pattern_config(cat_config)
+        .set_backend_pattern_configs(_get_linear_configs(linear_dtype_configs))
+        .set_backend_pattern_configs(_get_binary_op_configs(binary_op_dtype_configs))
+        .set_backend_pattern_configs(
+            _get_share_qparams_op_configs(share_qparams_op_dtype_configs)
+        )
+        .set_backend_pattern_configs(
+            _get_tensor_info_op_configs(tensor_info_op_dtype_configs)
+        )
+    )
+
+
+def get_tensorrt_backend_config_dict():
+    """
+    Return the `BackendConfig` for the TensorRT backend in dictionary form.
+    """
+    return get_tensorrt_backend_config().to_dict()

videochat2/lib/python3.10/site-packages/torch/ao/quantization/quantizer/utils.py

@@ -0,0 +1,83 @@
+# mypy: allow-untyped-defs
+from typing import List
+
+from torch.ao.quantization.pt2e.utils import _is_sym_size_node
+from torch.ao.quantization.quantizer.quantizer import QuantizationAnnotation
+from torch.fx import Node
+
+
+def _annotate_input_qspec_map(node: Node, input_node: Node, qspec):
+    quantization_annotation = node.meta.get(
+        "quantization_annotation", QuantizationAnnotation()
+    )
+    if quantization_annotation.input_qspec_map is None:
+        quantization_annotation.input_qspec_map = {}
+    quantization_annotation.input_qspec_map[input_node] = qspec
+    node.meta["quantization_annotation"] = quantization_annotation
+
+
+def _annotate_output_qspec(node: Node, qspec):
+    quantization_annotation = node.meta.get(
+        "quantization_annotation", QuantizationAnnotation()
+    )
+    quantization_annotation.output_qspec = qspec
+    node.meta["quantization_annotation"] = quantization_annotation
+
+
+def _node_only_used_for_sym_size(node: Node, partition_nodes: List[Node]):
+    """
+    This utility is used to handle cases when dynami_shape=True tracing leads
+    to symint nodes in the pattern of linear module. In those cases, we need to
+    distinguish between the nodes that are in input for just extracting value of
+    some dimentions (and symint nodes) vs. the one that is activation.
+    For example:
+    graph(x, y, weight):
+       size_0 = torch.ops.aten.sym_size([x], [0])
+       size_1 = torch.ops.aten.sym_size([y], [1])
+       view_size = size_0 * size_1
+       size_3 = torch.ops.aten.sym_size([x], [2])
+       vie_out = torch.ops.aten.view(x, [view_size, size_3])
+       return mm(view_out, weight)
+    In the example above y node is not actual input. It exist only to extract size_1
+    """
+    if _is_sym_size_node(node):
+        return True
+
+    return all(
+        ((user not in partition_nodes) or _is_sym_size_node(user))
+        for user in node.users
+    )
+
+
+def _get_module_name_filter(module_name: str):
+    """Get the module_name_filter function for a given module name, the filter accepts
+    a node and checks if the node comes from a module that has certain module name
+
+    For example:
+        node: linear_op = call_function[...](...)  # comes from a module with name blocks.sub.linear1
+
+
+    >> module_name_filter = _get_module_name_filter("blocks.sub")
+    >> print(module_name_filter(node))
+    True  # the node is from "blocks.sub" based on the fully qualified name "blocks.sub.linear1"
+    """
+
+    def module_name_filter(n: Node) -> bool:
+        # example: {
+        #    'L__self___sub': ("L['self'].sub", <class '....Sub'>),
+        #    'L__self___sub_linear': ("L['self'].sub.linear", <class 'torch.nn.modules.linear.Linear'>)
+        # }
+        # get_attr nodes doesn't have nn_module_stack?
+        nn_module_stack = n.meta.get("nn_module_stack", {})
+
+        def _normalize_path(n):
+            prefix = 0
+            # TODO This is non standard behavior and should be removed when we migrate off capture_pre_autograd_graph.
+            if n.startswith("L['self']."):
+                prefix = len("L['self'].")
+            return n[prefix:]
+
+        names = [_normalize_path(n) for n, _ in nn_module_stack.values()]
+        return module_name in names
+
+    return module_name_filter

videochat2/lib/python3.10/site-packages/torch/fx/experimental/__pycache__/symbolic_shapes.cpython-310.pyc

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:67258c30b54aed4ef977190f56b943682ffcecf9ed58de2c35e8800037664930
+size 144048

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

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <cstdint>
+#include <cstring>
+#include <mutex>
+#include <unordered_map>
+
+#include <c10/core/Allocator.h>
+#include <c10/macros/Export.h>
+#include <c10/util/Flags.h>
+
+// TODO: rename to c10
+C10_DECLARE_bool(caffe2_report_cpu_memory_usage);
+
+namespace c10 {
+
+using MemoryDeleter = void (*)(void*);
+
+// A helper function that is basically doing nothing.
+C10_API void NoDelete(void*);
+
+// A simple struct that is used to report C10's memory allocation,
+// deallocation status and out-of-memory events to the profiler
+class C10_API ProfiledCPUMemoryReporter {
+ public:
+  ProfiledCPUMemoryReporter() = default;
+  void New(void* ptr, size_t nbytes);
+  void OutOfMemory(size_t nbytes);
+  void Delete(void* ptr);
+
+ private:
+  std::mutex mutex_;
+  std::unordered_map<void*, size_t> size_table_;
+  size_t allocated_ = 0;
+  size_t log_cnt_ = 0;
+};
+
+C10_API ProfiledCPUMemoryReporter& profiledCPUMemoryReporter();
+
+// Get the CPU Allocator.
+C10_API at::Allocator* GetCPUAllocator();
+// Sets the CPU allocator to the given allocator: the caller gives away the
+// ownership of the pointer.
+C10_API void SetCPUAllocator(at::Allocator* alloc, uint8_t priority = 0);
+
+// Get the Default CPU Allocator
+C10_API at::Allocator* GetDefaultCPUAllocator();
+
+// Get the Default Mobile CPU Allocator
+C10_API at::Allocator* GetDefaultMobileCPUAllocator();
+
+// The CPUCachingAllocator is experimental and might disappear in the future.
+// The only place that uses it is in StaticRuntime.
+// Set the CPU Caching Allocator
+C10_API void SetCPUCachingAllocator(Allocator* alloc, uint8_t priority = 0);
+// Get the CPU Caching Allocator
+C10_API Allocator* GetCPUCachingAllocator();
+
+} // namespace c10

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

@@ -0,0 +1,129 @@
+#pragma once
+#include <c10/core/SymBool.h>
+#include <c10/core/SymInt.h>
+#include <c10/util/ArrayRef.h>
+#include <c10/util/SmallVector.h>
+#include <c10/util/irange.h>
+
+#include <algorithm>
+#include <cstdint>
+
+namespace c10 {
+
+template <typename T>
+bool _compute_contiguous(ArrayRef<T> sizes, ArrayRef<T> strides, T numel) {
+  bool is_contiguous = true;
+  if (TORCH_GUARD_SIZE_OBLIVIOUS(sym_eq(numel, 0))) {
+    return is_contiguous;
+  }
+  T z = 1;
+  // NB: make sure we do signed arithmetic
+  for (int64_t d = int64_t(sizes.size()) - 1; d >= 0; d--) {
+    const auto& size_d = sizes[d];
+    if (TORCH_GUARD_SIZE_OBLIVIOUS(sym_ne(size_d, 1))) {
+      if (TORCH_GUARD_SIZE_OBLIVIOUS(sym_eq(strides[d], z))) {
+        z *= size_d;
+      } else {
+        is_contiguous = false;
+        break;
+      }
+    }
+  }
+  return is_contiguous;
+}
+
+template <typename T>
+bool _compute_channels_last_contiguous_2d(
+    ArrayRef<T> sizes,
+    ArrayRef<T> strides) {
+  // Please don't combine these code, constant array is used here to let
+  // compiler fully unroll the loop to get better performance
+  switch (sizes.size()) {
+    case 4: {
+      T expected = 1;
+      for (auto& d : {1, 3, 2, 0}) {
+        const auto& size_d = sizes[d];
+        if (TORCH_GUARD_SIZE_OBLIVIOUS(sym_ne(size_d, 1))) {
+          if (TORCH_GUARD_SIZE_OBLIVIOUS(sym_ne(strides[d], expected))) {
+            return false;
+          }
+          expected *= size_d;
+        }
+      }
+      return true;
+    }
+      // NOLINTNEXTLINE(bugprone-branch-clone)
+    case 3:
+      // TODO dim == 3 case will be enabled once it is fully tested
+      return false;
+    default:
+      return false;
+  }
+}
+
+template <typename T>
+bool _compute_channels_last_contiguous_3d(
+    ArrayRef<T> sizes,
+    ArrayRef<T> strides) {
+  // Please don't combine these code, constant array is used here to let
+  // compiler fully unroll the loop to get better performance
+  switch (sizes.size()) {
+    case 5: {
+      T expected = 1;
+      for (auto& d : {1, 4, 3, 2, 0}) {
+        const auto& size_d = sizes[d];
+        if (TORCH_GUARD_SIZE_OBLIVIOUS(sym_ne(size_d, 1))) {
+          if (TORCH_GUARD_SIZE_OBLIVIOUS(sym_ne(strides[d], expected))) {
+            return false;
+          }
+          expected *= size_d;
+        }
+      }
+      return true;
+    }
+      // NOLINTNEXTLINE(bugprone-branch-clone)
+    case 4:
+      // TODO dim == 4 case will be enabled once it is fully tested
+      return false;
+    default:
+      return false;
+  }
+}
+
+template <typename T>
+bool _compute_non_overlapping_and_dense(
+    ArrayRef<T> sizes,
+    ArrayRef<T> strides) {
+  auto dim = sizes.size();
+  if (dim == 1) {
+    return sizes[0] < 2 || strides[0] == 1;
+  }
+  SmallVector<int64_t, 5> perm;
+  perm.resize(dim);
+  for (const auto i : c10::irange(dim)) {
+    perm[i] = i;
+  }
+  // Sort by strides, leaving 0 and 1 sized dims at the end of the array
+  std::sort(perm.begin(), perm.end(), [&](int64_t a, int64_t b) {
+    if (sizes[a] < 2) {
+      return false;
+    } else if (sizes[b] < 2) {
+      return true;
+    }
+    return strides[a] < strides[b];
+  });
+  T require_stride = 1;
+  for (const auto i : c10::irange(dim)) {
+    const auto& size_perm_i = sizes[perm[i]];
+    if (size_perm_i < 2) {
+      return true;
+    }
+    if (strides[perm[i]] != require_stride) {
+      return false;
+    }
+    require_stride *= size_perm_i;
+  }
+  return true;
+}
+
+} // namespace c10

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

@@ -0,0 +1,123 @@
+#pragma once
+
+// This is directly synchronized with caffe2/proto/caffe2.proto, but
+// doesn't require me to figure out how to get Protobuf headers into
+// ATen/core (which would require a lot more build system hacking.)
+// If you modify me, keep me synchronized with that file.
+
+#include <c10/macros/Export.h>
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <ostream>
+#include <string>
+
+namespace c10 {
+
+// These contains all device types that also have a BackendComponent
+// and therefore participate in per-backend functionality dispatch keys.
+// This is most backends except PrivateUse2 and PrivateUse3
+#define C10_FORALL_BACKEND_DEVICE_TYPES(_, extra) \
+  _(CPU, extra)                                   \
+  _(CUDA, extra)                                  \
+  _(HIP, extra)                                   \
+  _(XLA, extra)                                   \
+  _(MPS, extra)                                   \
+  _(IPU, extra)                                   \
+  _(XPU, extra)                                   \
+  _(HPU, extra)                                   \
+  _(VE, extra)                                    \
+  _(Lazy, extra)                                  \
+  _(Meta, extra)                                  \
+  _(MTIA, extra)                                  \
+  _(PrivateUse1, extra)
+
+enum class DeviceType : int8_t {
+  CPU = 0,
+  CUDA = 1, // CUDA.
+  MKLDNN = 2, // Reserved for explicit MKLDNN
+  OPENGL = 3, // OpenGL
+  OPENCL = 4, // OpenCL
+  IDEEP = 5, // IDEEP.
+  HIP = 6, // AMD HIP
+  FPGA = 7, // FPGA
+  MAIA = 8, // ONNX Runtime / Microsoft
+  XLA = 9, // XLA / TPU
+  Vulkan = 10, // Vulkan
+  Metal = 11, // Metal
+  XPU = 12, // XPU
+  MPS = 13, // MPS
+  Meta = 14, // Meta (tensors with no data)
+  HPU = 15, // HPU / HABANA
+  VE = 16, // SX-Aurora / NEC
+  Lazy = 17, // Lazy Tensors
+  IPU = 18, // Graphcore IPU
+  MTIA = 19, // Meta training and inference devices
+  PrivateUse1 = 20, // PrivateUse1 device
+  // NB: If you add more devices:
+  //  - Change the implementations of DeviceTypeName and isValidDeviceType
+  //    in DeviceType.cpp
+  //  - Change the number below
+  COMPILE_TIME_MAX_DEVICE_TYPES = 21,
+};
+
+constexpr DeviceType kCPU = DeviceType::CPU;
+constexpr DeviceType kCUDA = DeviceType::CUDA;
+constexpr DeviceType kHIP = DeviceType::HIP;
+constexpr DeviceType kFPGA = DeviceType::FPGA;
+constexpr DeviceType kMAIA = DeviceType::MAIA;
+constexpr DeviceType kXLA = DeviceType::XLA;
+constexpr DeviceType kMPS = DeviceType::MPS;
+constexpr DeviceType kMeta = DeviceType::Meta;
+constexpr DeviceType kVulkan = DeviceType::Vulkan;
+constexpr DeviceType kMetal = DeviceType::Metal;
+constexpr DeviceType kXPU = DeviceType::XPU;
+constexpr DeviceType kHPU = DeviceType::HPU;
+constexpr DeviceType kVE = DeviceType::VE;
+constexpr DeviceType kLazy = DeviceType::Lazy;
+constexpr DeviceType kIPU = DeviceType::IPU;
+constexpr DeviceType kMTIA = DeviceType::MTIA;
+constexpr DeviceType kPrivateUse1 = DeviceType::PrivateUse1;
+
+// define explicit int constant
+constexpr int COMPILE_TIME_MAX_DEVICE_TYPES =
+    static_cast<int>(DeviceType::COMPILE_TIME_MAX_DEVICE_TYPES);
+
+static_assert(
+    COMPILE_TIME_MAX_DEVICE_TYPES <= 21,
+    "Hey!  You seem to be adding a lot of new DeviceTypes.  The intent was "
+    "for this constant to reflect the actual number of DeviceTypes we support "
+    "in PyTorch; it's important that this number is not too large as we "
+    "use this to allocate stack arrays in some places in our code.  If you "
+    "are indeed just adding the 20th device type, feel free to change "
+    "the check to 32; but if you are adding some sort of extensible device "
+    "types registration, please be aware that you are affecting code that "
+    "this number is small.  Try auditing uses of this constant.");
+
+C10_API std::string DeviceTypeName(DeviceType d, bool lower_case = false);
+
+C10_API bool isValidDeviceType(DeviceType d);
+
+C10_API std::ostream& operator<<(std::ostream& stream, DeviceType type);
+
+C10_API void register_privateuse1_backend(const std::string& backend_name);
+C10_API std::string get_privateuse1_backend(bool lower_case = true);
+
+C10_API bool is_privateuse1_backend_registered();
+
+} // namespace c10
+
+namespace std {
+template <>
+struct hash<c10::DeviceType> {
+  std::size_t operator()(c10::DeviceType k) const {
+    return std::hash<int>()(static_cast<int>(k));
+  }
+};
+} // namespace std
+
+namespace torch {
+// NOLINTNEXTLINE(misc-unused-using-decls)
+using c10::DeviceType;
+} // namespace torch

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

@@ -0,0 +1,290 @@
+#pragma once
+
+#include <c10/util/ArrayRef.h>
+#include <c10/util/Exception.h>
+
+#include <cstdint>
+#include <ostream>
+#include <vector>
+
+// Memory format is not the property of a Tensor. It is the way to tell an
+// operator how the result should be organized in memory and nothing more. That
+// means memory format should never be used as return value for any tensor state
+// interrogation functions (internally and externally).
+//
+// Possible options are:
+//  Preserve:
+//    If any of the input tensors is in channels_last format, operator output
+//    should be in channels_last format
+//
+//  Contiguous:
+//    Regardless of input tensors format, the output should be contiguous
+//    Tensor.
+//
+//  ChannelsLast:
+//    Regardless of input tensors format, the output should be in channels_last
+//    format.
+
+namespace c10 {
+enum class MemoryFormat : int8_t {
+  Contiguous,
+  Preserve,
+  ChannelsLast,
+  ChannelsLast3d,
+  NumOptions
+};
+
+// If you are seeing this, it means that this call site was not checked if
+// the memory format could be preserved, and it was switched to old default
+// behaviour of contiguous
+#define LEGACY_CONTIGUOUS_MEMORY_FORMAT c10::get_contiguous_memory_format()
+
+inline MemoryFormat get_contiguous_memory_format() {
+  return MemoryFormat::Contiguous;
+}
+
+inline std::ostream& operator<<(
+    std::ostream& stream,
+    at::MemoryFormat memory_format) {
+  switch (memory_format) {
+    case MemoryFormat::Preserve:
+      return stream << "Preserve";
+    case MemoryFormat::Contiguous:
+      return stream << "Contiguous";
+    case MemoryFormat::ChannelsLast:
+      return stream << "ChannelsLast";
+    case MemoryFormat::ChannelsLast3d:
+      return stream << "ChannelsLast3d";
+    default:
+      TORCH_CHECK(false, "Unknown memory format ", memory_format);
+  }
+}
+
+// Note: Hardcoded the channel last stride indices here to get better
+// performance
+template <typename T>
+inline std::vector<T> get_channels_last_strides_2d(ArrayRef<T> sizes) {
+  std::vector<T> strides(sizes.size());
+  switch (sizes.size()) {
+    case 4:
+      strides[1] = 1;
+      strides[3] = sizes[1];
+      strides[2] = strides[3] * sizes[3];
+      strides[0] = strides[2] * sizes[2];
+      return strides;
+    case 3:
+      strides[0] = 1;
+      strides[2] = sizes[0];
+      strides[1] = strides[2] * sizes[2];
+      return strides;
+    default:
+      TORCH_INTERNAL_ASSERT(
+          false, "ChannelsLast2d doesn't support size ", sizes.size());
+  }
+}
+
+inline std::vector<int64_t> get_channels_last_strides_2d(IntArrayRef sizes) {
+  return get_channels_last_strides_2d<int64_t>(sizes);
+}
+
+template <typename T>
+std::vector<T> get_channels_last_strides_3d(ArrayRef<T> sizes) {
+  std::vector<T> strides(sizes.size());
+  switch (sizes.size()) {
+    case 5:
+      strides[1] = 1;
+      strides[4] = sizes[1];
+      strides[3] = strides[4] * sizes[4];
+      strides[2] = strides[3] * sizes[3];
+      strides[0] = strides[2] * sizes[2];
+      return strides;
+    case 4:
+      strides[0] = 1;
+      strides[3] = sizes[0];
+      strides[2] = strides[3] * sizes[3];
+      strides[1] = strides[2] * sizes[2];
+      return strides;
+    default:
+      TORCH_INTERNAL_ASSERT(
+          false, "ChannelsLast3d doesn't support size ", sizes.size());
+  }
+}
+
+inline std::vector<int64_t> get_channels_last_strides_3d(IntArrayRef sizes) {
+  return get_channels_last_strides_3d<int64_t>(sizes);
+}
+
+// NOTE:
+// Below are Helper functions for is_channels_last_strides_xd.
+// 1. Please do not combine these helper functions, each helper function handles
+// exactly one case of sizes + memory_format, by doing this, the strides indices
+// will be a constant array and we can access it using constant index number,
+// the compiler will fully unroll the loop on strides indices to gain a better
+// performance.
+// 2. No error check in helper function, caller ensures the correctness of the
+// input
+// 3. All helper functions have similar comments, only 1st helper function is
+// commented here.
+template <typename T>
+inline bool is_channels_last_strides_2d_s4(
+    const ArrayRef<T> sizes,
+    const ArrayRef<T> strides) {
+  T min = 0;
+  // special case for trivial C dimension. default to NCHW
+  if (strides[1] == 0) {
+    return false;
+  }
+  // loop strides indices
+  for (auto& d : {1, 3, 2, 0}) {
+    if (sizes[d] == 0) {
+      return false;
+    }
+    if (strides[d] < min) {
+      return false;
+    }
+    // Fallback to NCHW as default layout for ambiguous cases
+    // This is the flaw of implicit memory_format from strides.
+    // N111 tensor with identical strides for size 1 dimension;
+    // Two cases could lead us here:
+    // a. N111 contiguous Tensor ([N,1,1,1]@[1,1,1,1])
+    // b. N11W contiguous Tensor sliced on the W-dimension.
+    // ([N,1,1,1]@[W,W,W,W])
+    if (d == 0 && min == strides[1]) {
+      return false;
+    }
+    // This is necessary to:
+    // 1. distinguish the memory_format of N1H1;
+    //     [H, 1, 1, 1] channels_last stride
+    //     [H, H, 1, 1] contiguous stride
+    // 2. permutation of 1C1W:
+    //     [1, C, 1, H]@[HC, H, H, 1] transpose(1, 3)
+    //     [1, H, 1, C]@[HC, 1, H, H] shouldn't be identified as channels_last
+    min = strides[d];
+    if (sizes[d] > 1) {
+      min *= sizes[d];
+    }
+  }
+  return true;
+}
+
+template <typename T>
+inline bool is_channels_last_strides_3d_s5(
+    const ArrayRef<T> sizes,
+    const ArrayRef<T> strides) {
+  T min = 0;
+  if (strides[1] == 0) {
+    return false;
+  }
+  for (auto& d : {1, 4, 3, 2, 0}) {
+    if (sizes[d] == 0) {
+      return false;
+    }
+    if (strides[d] < min) {
+      return false;
+    }
+    if (d == 0 && min == strides[1]) {
+      return false;
+    }
+    min = strides[d];
+    if (sizes[d] > 1) {
+      min *= sizes[d];
+    }
+  }
+  return true;
+}
+
+// Note [Ambiguous is_channels_last_strides_xd]
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// The flaw of carrying memory_format implicitly through strides is very hard
+// to WAR properly. issue #24090
+// Without the history of permutation, we can't infer the memory_format of a
+// tensor from the snapshot of its size & stride
+// e.g.
+//
+// 1. We can NOT specify the memory_format of N111 tensor through strides in a
+//  meaningful way;
+//
+// 2. Two path that ended up with identical size/stride
+//  N11W contiguous tensor sliced at w-dimension becomes [N,1,1,1]@[W,W,W,W]
+//  NC11 channels_last tensor sliced at c-dimension becomes [N,1,1,1]@[C,C,C,C]
+//    So if we see a tensor [N,1,1,1]@[X,X,X,X], there's no way for us to infer
+//    the memory_format of the original tensor.
+//
+// Due to the limitations, our temporary WAR `is_channels_last_strides` does the
+// best effort to infer whether the original memory_format of a tensor is
+// at::MemoryFormat::ChannelsLast. The two objectives of this function (ordered
+// by their importance):
+//   1. Ensure that normal shape manipulation does not accidentally change the
+//      MemoryFormat of an existing tensor.
+//   2. Allows user to mark MemoryFormat::ChannelsLast to tensors;
+//
+// The function does so via checking strides of the tensor, including strides of
+// size-1 dimensions. Although conventionally PyTorch implies no restriction on
+// trivial stride (stride for size-1 dimension).
+//
+// Note that this approach is a compromise. We did not solve the problem
+// completely. Many cases we will not be able to infer the correct memory
+// format.
+// The implementation of `is_channels_last_strides` is to serve the objectives:
+// MemoryFormat::ChannelsLast has to be explicitly opted-in (no accidental
+// conversion); Best effort to maintain the ChannelsLast flag.
+//
+// Due to the fact that this is not a bulletproof solution, through testing
+// (aten/src/ATen/test/memory_format_test.cpp)
+//   a. we ensure that the common tasks are supported;
+//   a. we identify corner cases where the implementation compromises on.
+//
+// By the time accumulated permutation is enabled to replace implicit
+// memory_format through strides, we should be updating our tests and fix the
+// issues in our tests.
+//
+// We use Channels Last 2d as an example above.
+// This is a general problem for all the is_channels_last_strides_xd
+// implementation. Please check the helper functions
+// (is_channels_last_strides_*d_s*) for more details.
+
+template <typename T>
+inline bool is_channels_last_strides_2d(
+    const ArrayRef<T> sizes,
+    const ArrayRef<T> strides) {
+  switch (sizes.size()) {
+    case 4:
+      return is_channels_last_strides_2d_s4(sizes, strides);
+      // NOLINTNEXTLINE(bugprone-branch-clone)
+    case 3:
+      // TODO dim == 3 case will be enabled once it is fully tested
+      return false;
+    default:
+      return false;
+  }
+}
+
+template <typename T>
+inline bool is_channels_last_strides_3d(
+    const ArrayRef<T> sizes,
+    const ArrayRef<T> strides) {
+  switch (sizes.size()) {
+    case 5:
+      return is_channels_last_strides_3d_s5(sizes, strides);
+      // NOLINTNEXTLINE(bugprone-branch-clone)
+    case 4:
+      // TODO dim == 4 case will be enabled once it is fully tested
+      return false;
+    default:
+      return false;
+  }
+}
+
+inline bool is_channels_last_strides_2d(
+    const IntArrayRef sizes,
+    const IntArrayRef strides) {
+  return is_channels_last_strides_2d<int64_t>(sizes, strides);
+}
+
+inline bool is_channels_last_strides_3d(
+    const IntArrayRef sizes,
+    const IntArrayRef strides) {
+  return is_channels_last_strides_3d<int64_t>(sizes, strides);
+}
+
+} // namespace c10

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

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <c10/util/Exception.h>
+#include <cstdint>
+#include <string>
+
+namespace c10 {
+
+/**
+ * QScheme is an enum that specifies the type of quantization. This has a one
+ * to one correspondence with Quantizer
+ * Please refer to ATen/quantized/Quantizer.h to see the Quantizers classes.
+ * Keep this file in sync with torch/nn/_qscheme.py
+ */
+enum class QScheme : uint8_t {
+  PER_TENSOR_AFFINE = 0,
+  PER_CHANNEL_AFFINE = 1,
+  PER_TENSOR_SYMMETRIC = 2,
+  PER_CHANNEL_SYMMETRIC = 3,
+  PER_CHANNEL_AFFINE_FLOAT_QPARAMS = 4,
+  COMPILE_TIME_NUM_QSCHEMES = 5,
+};
+
+constexpr auto kPerTensorAffine = QScheme::PER_TENSOR_AFFINE;
+constexpr auto kPerChannelAffine = QScheme::PER_CHANNEL_AFFINE;
+constexpr auto kPerTensorSymmetric = QScheme::PER_TENSOR_SYMMETRIC;
+constexpr auto kPerChannelSymmetric = QScheme::PER_CHANNEL_SYMMETRIC;
+constexpr auto kPerChannelAffineFloatQParams =
+    QScheme::PER_CHANNEL_AFFINE_FLOAT_QPARAMS;
+constexpr int COMPILE_TIME_NUM_QSCHEMES =
+    static_cast<int>(QScheme::COMPILE_TIME_NUM_QSCHEMES);
+
+inline std::string toString(QScheme qscheme) {
+  switch (qscheme) {
+    case kPerTensorAffine:
+      return "per_tensor_affine";
+    case kPerChannelAffine:
+      return "per_channel_affine";
+    case kPerTensorSymmetric:
+      return "per_tensor_symmetric";
+    case kPerChannelSymmetric:
+      return "per_channel_symmetric";
+    case kPerChannelAffineFloatQParams:
+      return "per_channel_affine_float_qparams";
+    default:
+      TORCH_CHECK(false, "Unrecognized qscheme: ", static_cast<int>(qscheme));
+  }
+}
+
+} // namespace c10

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

@@ -0,0 +1,110 @@
+#pragma once
+
+#include <c10/core/SymNodeImpl.h>
+#include <c10/macros/Export.h>
+#include <c10/util/Exception.h>
+#include <c10/util/intrusive_ptr.h>
+#include <cstdint>
+#include <optional>
+#include <ostream>
+#include <utility>
+
+namespace c10 {
+
+class C10_API SymBool {
+ public:
+  /*implicit*/ SymBool(bool b) : data_(b){};
+  SymBool(SymNode ptr) : data_(false), ptr_(std::move(ptr)) {
+    TORCH_CHECK(ptr_->is_bool());
+  };
+  SymBool() : data_(false) {}
+
+  SymNodeImpl* toSymNodeImplUnowned() const {
+    return ptr_.get();
+  }
+
+  SymNodeImpl* release() && {
+    return std::move(ptr_).release();
+  }
+
+  // Only valid if is_heap_allocated()
+  SymNode toSymNodeImpl() const;
+
+  // Guaranteed to return a SymNode, wrapping using base if necessary
+  SymNode wrap_node(const SymNode& base) const;
+
+  bool expect_bool() const {
+    std::optional<bool> c = maybe_as_bool();
+    TORCH_CHECK(c.has_value());
+    return *c;
+  }
+
+  SymBool sym_and(const SymBool&) const;
+  SymBool sym_or(const SymBool&) const;
+  SymBool sym_not() const;
+
+  SymBool operator&(const SymBool& other) const {
+    return sym_and(other);
+  }
+  SymBool operator|(const SymBool& other) const {
+    return sym_or(other);
+  }
+  SymBool operator~() const {
+    return sym_not();
+  }
+
+  // Insert a guard for the bool to be its concrete value, and then return
+  // that value.  Note that C++ comparison operations default to returning
+  // bool, so it's not so common to have to call this
+  bool guard_bool(const char* file, int64_t line) const;
+  bool expect_true(const char* file, int64_t line) const;
+  bool guard_size_oblivious(const char* file, int64_t line) const;
+
+  bool has_hint() const;
+
+  bool as_bool_unchecked() const {
+    return data_;
+  }
+
+  std::optional<bool> maybe_as_bool() const {
+    if (!is_heap_allocated()) {
+      return std::make_optional(data_);
+    }
+    return toSymNodeImplUnowned()->constant_bool();
+  }
+
+  bool is_heap_allocated() const {
+    return ptr_;
+  }
+
+ private:
+  // TODO: optimize to union
+  bool data_;
+  SymNode ptr_;
+};
+
+C10_API std::ostream& operator<<(std::ostream& os, const SymBool& s);
+
+#define TORCH_SYM_CHECK(cond, ...) \
+  TORCH_CHECK((cond).expect_true(__FILE__, __LINE__), __VA_ARGS__)
+#define TORCH_SYM_INTERNAL_ASSERT(cond, ...) \
+  TORCH_INTERNAL_ASSERT((cond).expect_true(__FILE__, __LINE__), __VA_ARGS__)
+
+inline bool guard_size_oblivious(
+    bool b,
+    const char* file [[maybe_unused]],
+    int64_t line [[maybe_unused]]) {
+  return b;
+}
+
+inline bool guard_size_oblivious(
+    const c10::SymBool& b,
+    const char* file,
+    int64_t line) {
+  return b.guard_size_oblivious(file, line);
+}
+
+#define TORCH_GUARD_SIZE_OBLIVIOUS(cond) \
+  c10::guard_size_oblivious((cond), __FILE__, __LINE__)
+
+} // namespace c10

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

@@ -0,0 +1,113 @@
+#pragma once
+
+#include <c10/core/SymBool.h>
+#include <c10/core/SymNodeImpl.h>
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Exception.h>
+#include <c10/util/intrusive_ptr.h>
+
+#include <cstdint>
+#include <limits>
+#include <ostream>
+#include <utility>
+
+namespace c10 {
+
+// NB: this is actually double precision; we're using the Python naming here
+class C10_API SymFloat {
+ public:
+  /*implicit*/ SymFloat(double d) : data_(d){};
+  SymFloat(SymNode ptr)
+      : data_(std::numeric_limits<double>::quiet_NaN()), ptr_(std::move(ptr)) {
+    TORCH_CHECK(ptr_->is_float());
+  };
+  SymFloat() : data_(0.0) {}
+
+  SymNodeImpl* toSymNodeImplUnowned() const {
+    return ptr_.get();
+  }
+
+  SymNodeImpl* release() && {
+    return std::move(ptr_).release();
+  }
+
+  // Only valid if is_symbolic()
+  SymNode toSymNodeImpl() const;
+
+  // Guaranteed to return a SymNode, wrapping using base if necessary
+  SymNode wrap_node(const SymNode& base) const;
+
+  double expect_float() const {
+    TORCH_CHECK(!is_symbolic());
+    return data_;
+  }
+
+  SymFloat operator+(const SymFloat&) const;
+  SymFloat operator-(const SymFloat&) const;
+  SymFloat operator*(const SymFloat&) const;
+  SymFloat operator/(const SymFloat&) const;
+
+  SymBool sym_eq(const SymFloat&) const;
+  SymBool sym_ne(const SymFloat&) const;
+  SymBool sym_lt(const SymFloat&) const;
+  SymBool sym_le(const SymFloat&) const;
+  SymBool sym_gt(const SymFloat&) const;
+  SymBool sym_ge(const SymFloat&) const;
+
+  bool operator==(const SymFloat& o) const {
+    return sym_eq(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator!=(const SymFloat& o) const {
+    return sym_ne(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator<(const SymFloat& o) const {
+    return sym_lt(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator<=(const SymFloat& o) const {
+    return sym_le(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator>(const SymFloat& o) const {
+    return sym_gt(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator>=(const SymFloat& o) const {
+    return sym_ge(o).guard_bool(__FILE__, __LINE__);
+  }
+
+  SymFloat min(const SymFloat& sci) const;
+  SymFloat max(const SymFloat& sci) const;
+
+  // Need guidance on where to put this code
+  SymFloat sqrt() const;
+
+  // Insert a guard for the float to be its concrete value, and then return
+  // that value.  This operation always works, even if the float is symbolic,
+  // so long as we know what the underlying value is. Don't blindly put this
+  // everywhere; you can cause overspecialization of PyTorch programs with
+  // this method.
+  //
+  // It should be called as guard_float(__FILE__, __LINE__).  The file and line
+  // number can be used to diagnose overspecialization.
+  double guard_float(const char* file, int64_t line) const;
+
+  bool has_hint() const;
+
+  // N.B. It's important to keep this definition in the header
+  // as we expect if checks to be folded for mobile builds
+  // where `is_symbolic` is always false
+  C10_ALWAYS_INLINE bool is_symbolic() const {
+    return ptr_;
+  }
+
+  double as_float_unchecked() const {
+    return data_;
+  }
+
+ private:
+  // TODO: optimize to union
+  double data_;
+  SymNode ptr_;
+};
+
+C10_API std::ostream& operator<<(std::ostream& os, const SymFloat& s);
+} // namespace c10

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

@@ -0,0 +1,424 @@
+#pragma once
+
+#include <c10/core/SymBool.h>
+#include <c10/core/SymNodeImpl.h>
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Exception.h>
+#include <c10/util/Optional.h>
+
+#include <cstdint>
+#include <iterator>
+#include <numeric>
+#include <optional>
+#include <ostream>
+#include <type_traits>
+
+namespace c10 {
+
+class SymFloat;
+
+// SymInt represents either a regular int64_t, or a symbolic integer
+// (represented in a type erased way as SymNode).  The intention is for SymInt
+// to represent symbolic sizes that arise when doing shape computation in
+// operator kernels. This allows for tracing through programs without baking in
+// concrete sizes into kernel calls.
+//
+// SymInt has an API equivalent to int64_t.  In particular, it is a value type.
+// Internally, SymInt is represented in a clever packed way, so that it only
+// occupies one word of space; but morally, it is a union between an int64_t
+// and an intrusive pointer to SymNodeImpl.
+//
+// Invariant: the referenced SymNodeImpl is guaranteed to be a SymNode where
+// is_int() returns true
+
+class C10_API SymInt {
+ public:
+  enum Unchecked {
+    UNCHECKED,
+  };
+
+  /*implicit*/ SymInt(int64_t d) : data_(d) {
+    if (is_heap_allocated()) {
+      // Large negative number, heap allocate it
+      promote_to_negative();
+    }
+  };
+  SymInt() : data_(0) {}
+  SymInt(SymNode n);
+
+  // unchecked c-tor accepting raw `data_`
+  // One appropriate use for this is when you are constructing a symint
+  // in a situation where you know it is non-negative (or, if it is negative,
+  // the negative value is -1; i.e., not user controlled)
+  SymInt(Unchecked, int64_t d) : data_(d) {}
+
+  // TODO: these implementations are not optimal because they allocate a
+  // temporary and then use the move constructor/assignment
+  SymInt(const SymInt& s) : data_(0) {
+    if (s.is_heap_allocated()) {
+      *this = SymInt(s.toSymNode());
+    } else {
+      data_ = s.data_;
+    }
+  }
+  SymInt(SymInt&& s) noexcept : data_(s.data_) {
+    s.data_ = 0;
+  }
+
+  SymInt& operator=(const SymInt& s) {
+    if (this != &s) {
+      if (s.is_heap_allocated()) {
+        *this = SymInt(s.toSymNode());
+      } else {
+        data_ = s.data_;
+      }
+    }
+    return *this;
+  }
+  SymInt& operator=(SymInt&& s) noexcept {
+    if (this != &s) {
+      release_(); // release the current SymNode if any
+      data_ = s.data_;
+      if (s.is_heap_allocated())
+        s.data_ = 0;
+    };
+    return *this;
+  }
+
+  SymNodeImpl* toSymNodeImplUnowned() const {
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(is_heap_allocated());
+    uint64_t unextended_bits = static_cast<uint64_t>(data_) & ~MASK;
+    uint64_t sign_bit_mask = 1ULL << (62 - 1);
+    // https://stackoverflow.com/questions/42534749/signed-extension-from-24-bit-to-32-bit-in-c
+    uint64_t extended_bits = (unextended_bits ^ sign_bit_mask) - sign_bit_mask;
+    return static_cast<SymNodeImpl*>(
+        // NOLINTNEXTLINE(performance-no-int-to-ptr)
+        reinterpret_cast<void*>(static_cast<uintptr_t>(extended_bits)));
+  }
+
+  void release_() {
+    if (is_heap_allocated()) {
+      SymNode::reclaim(toSymNodeImplUnowned()); // steal
+    }
+  }
+
+  SymNodeImpl* release() && {
+#ifndef C10_MOBILE
+    TORCH_INTERNAL_ASSERT(is_heap_allocated());
+    auto* r = toSymNodeImplUnowned();
+    data_ = 0; // transfer ownership
+    return r;
+#else
+    TORCH_INTERNAL_ASSERT(false);
+#endif
+  }
+
+  // Only valid if is_heap_allocated()
+  SymNode toSymNode() const;
+
+  // Guaranteed to return a SymNode, wrapping using base if necessary
+  SymNode wrap_node(const SymNode& base) const;
+
+  ~SymInt() {
+    release_();
+  }
+
+  // Require the int to be non-symbolic, and if it is symbolic raise an
+  // error.  This is safe to use for C++ code that doesn't work for symbolic
+  // shapes, and you don't have time to fix it immediately, as if we
+  // try to trigger the path in C++ you'll appropriately get an error
+  int64_t expect_int() const {
+    if (auto r = maybe_as_int()) {
+      return *r;
+    }
+    TORCH_CHECK_ALWAYS_SHOW_CPP_STACKTRACE(
+        false, "when unpacking SymInt, expected int but got ", *this);
+  }
+
+  // Test if we have a hint for this int (e.g., guard_int would work).
+  // Most of the time this is true; it is only false when you have
+  // an unbacked SymInt.
+  bool has_hint() const;
+
+  // Insert a guard for the int to be its concrete value, and then return
+  // that value.  This operation always works, even if the int is symbolic,
+  // so long as we know what the underlying value is (e.g., this won't work
+  // if you call it on the size of nonzero output).  Don't blindly put this
+  // everywhere; you can cause overspecialization of PyTorch programs with
+  // this method.
+  //
+  // It should be called as guard_int(__FILE__, __LINE__).  The file and line
+  // number can be used to diagnose overspecialization.
+  int64_t guard_int(const char* file, int64_t line) const;
+
+  // Insert a guard that this SymInt must be size-like, returning true if
+  // the integer actually is >= 0.  Unlike manually performing a >= 0 test,
+  // if the SymInt in question is an unbacked SymInt (or, potentially in the
+  // future, if it contains unbacked SymInts), we will also treat the
+  // unbacked SymInt as statically testing >= 2 (which will prevent us from
+  // choking on, e.g., contiguity checks.)
+  bool expect_size(const char* file, int64_t line) const;
+
+  // Distinguish actual symbolic values from constants stored on the heap
+  bool is_symbolic() const {
+    return is_heap_allocated() &&
+        !toSymNodeImplUnowned()->constant_int().has_value();
+  }
+
+  // N.B. It's important to keep this definition in the header
+  // as we expect if checks to be folded for mobile builds
+  // where `is_heap_allocated` is always false and optimize dead code paths
+  C10_ALWAYS_INLINE bool is_heap_allocated() const {
+#ifdef C10_MOBILE
+    return false;
+#else
+    return !check_range(data_);
+#endif
+  }
+
+  SymInt operator+(const SymInt& sci) const;
+  SymInt operator-(const SymInt& sci) const;
+  SymInt operator*(const SymInt& sci) const;
+  SymInt operator/(const SymInt& sci) const;
+  SymInt operator%(const SymInt& sci) const;
+  void operator*=(const SymInt& sci);
+  void operator+=(const SymInt& sci);
+  void operator/=(const SymInt& sci);
+
+  SymInt clone() const;
+
+  SymBool sym_eq(const SymInt&) const;
+  SymBool sym_ne(const SymInt&) const;
+  SymBool sym_lt(const SymInt&) const;
+  SymBool sym_le(const SymInt&) const;
+  SymBool sym_gt(const SymInt&) const;
+  SymBool sym_ge(const SymInt&) const;
+
+  bool operator==(const SymInt& o) const {
+    return sym_eq(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator!=(const SymInt& o) const {
+    return sym_ne(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator<(const SymInt& o) const {
+    return sym_lt(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator<=(const SymInt& o) const {
+    return sym_le(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator>(const SymInt& o) const {
+    return sym_gt(o).guard_bool(__FILE__, __LINE__);
+  }
+  bool operator>=(const SymInt& o) const {
+    return sym_ge(o).guard_bool(__FILE__, __LINE__);
+  }
+
+  SymInt min(const SymInt& sci) const;
+  SymInt max(const SymInt& sci) const;
+
+  // If both are symbolic, this checks if
+  // they share the same node.
+  // If both are not symbolic this just checks normal equality.
+  bool is_same(const SymInt& other) const;
+
+  operator SymFloat() const;
+
+  // Don't use this.  Prefer maybe_as_int instead
+  int64_t as_int_unchecked() const {
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(!is_heap_allocated());
+    return data_;
+  }
+
+  std::optional<int64_t> maybe_as_int() const {
+    if (!is_heap_allocated()) {
+      return std::make_optional(data_);
+    }
+    auto* node = toSymNodeImplUnowned();
+    if (auto c = node->constant_int()) {
+      return c;
+    }
+    return node->maybe_as_int();
+  }
+
+  // Return whether the integer is directly coercible to a SymInt
+  // without requiring heap allocation.  You don't need to use this
+  // to check if you can pass an integer to SymInt; this is guaranteed
+  // to work (it just might heap allocate!)
+  static bool check_range(int64_t i) {
+    return i > MAX_UNREPRESENTABLE_INT;
+  }
+
+  // Return the min representable integer as a SymInt without
+  // heap allocation.  For quantities that count bytes (or larger),
+  // this is still much larger than you need, so you may consider
+  // using this as a more efficient version of MIN_INT
+  static constexpr int64_t min_representable_int() {
+    return MAX_UNREPRESENTABLE_INT + 1;
+  }
+
+ private:
+  void promote_to_negative();
+
+  // Constraints on the internal representation:
+  //
+  // - Should represent positive and small negative ints
+  // - No conversion necessary for operations on ints
+  // - Must represent valid 64-bit pointers
+  // - Is symbolic test should be FAST (two arithmetic instructions is too
+  // much).
+  //   This code being a hotpath is based on Strobelight profiles of
+  //   is_heap_allocated().  FB only: https://fburl.com/strobelight/5l50ncxd
+  //   (you will need to change the time window).
+  //
+  // So, the scheme is to reserve large negative numbers (assuming
+  // two's complement):
+  //
+  // - 0b0.... means we are a positive int
+  // - 0b11... means we are a small negative int
+  // - 0b10... means we are are a pointer. This means that
+  //           [-2^63, -2^62-1] are not representable as ints.
+  //           We don't actually need all of this space as on x86_64
+  //           as the top 16bits aren't used for anything
+  static constexpr uint64_t MASK = 1ULL << 63 | 1ULL << 62 | 1ULL << 61;
+  static constexpr uint64_t IS_SYM = 1ULL << 63 | 1ULL << 61;
+  // We must manually translate the bit pattern test into a greater
+  // than test because compiler doesn't figure it out:
+  // https://godbolt.org/z/356aferaW
+  static constexpr int64_t MAX_UNREPRESENTABLE_INT =
+      -1LL & static_cast<int64_t>(~(1ULL << 62));
+  int64_t data_;
+};
+
+/// Sum of a list of SymInt; accumulates into the c10::SymInt expression
+template <
+    typename C,
+    typename std::enable_if_t<
+        std::is_same_v<typename C::value_type, c10::SymInt>,
+        int> = 0>
+inline c10::SymInt multiply_integers(const C& container) {
+  return std::accumulate(
+      container.begin(),
+      container.end(),
+      c10::SymInt(1),
+      [](const c10::SymInt& a, const c10::SymInt& b) { return a * b; });
+}
+
+template <
+    typename Iter,
+    typename = std::enable_if_t<std::is_same_v<
+        typename std::iterator_traits<Iter>::value_type,
+        c10::SymInt>>>
+inline c10::SymInt multiply_integers(Iter begin, Iter end) {
+  return std::accumulate(
+      begin,
+      end,
+      c10::SymInt(1),
+      [](const c10::SymInt& a, const c10::SymInt& b) { return a * b; });
+}
+
+#define DECLARE_SYMINT_OP_INTONLY(scalar_t, RetTy)      \
+  C10_API RetTy operator%(const SymInt& a, scalar_t b); \
+  C10_API RetTy operator%(scalar_t a, const SymInt& b);
+
+#define DECLARE_SYMINT_OP(scalar_t, RetTy)              \
+  C10_API RetTy operator+(const SymInt& a, scalar_t b); \
+  C10_API RetTy operator-(const SymInt& a, scalar_t b); \
+  C10_API RetTy operator*(const SymInt& a, scalar_t b); \
+  C10_API RetTy operator/(const SymInt& a, scalar_t b); \
+  C10_API RetTy operator+(scalar_t a, const SymInt& b); \
+  C10_API RetTy operator-(scalar_t a, const SymInt& b); \
+  C10_API RetTy operator*(scalar_t a, const SymInt& b); \
+  C10_API RetTy operator/(scalar_t a, const SymInt& b); \
+  C10_API bool operator==(const SymInt& a, scalar_t b); \
+  C10_API bool operator!=(const SymInt& a, scalar_t b); \
+  C10_API bool operator<(const SymInt& a, scalar_t b);  \
+  C10_API bool operator<=(const SymInt& a, scalar_t b); \
+  C10_API bool operator>(const SymInt& a, scalar_t b);  \
+  C10_API bool operator>=(const SymInt& a, scalar_t b); \
+  C10_API bool operator==(scalar_t a, const SymInt& b); \
+  C10_API bool operator!=(scalar_t a, const SymInt& b); \
+  C10_API bool operator<(scalar_t a, const SymInt& b);  \
+  C10_API bool operator<=(scalar_t a, const SymInt& b); \
+  C10_API bool operator>(scalar_t a, const SymInt& b);  \
+  C10_API bool operator>=(scalar_t a, const SymInt& b);
+
+DECLARE_SYMINT_OP_INTONLY(int64_t, SymInt)
+DECLARE_SYMINT_OP_INTONLY(int32_t, SymInt)
+DECLARE_SYMINT_OP_INTONLY(uint64_t, SymInt)
+DECLARE_SYMINT_OP_INTONLY(uint32_t, SymInt)
+DECLARE_SYMINT_OP(int64_t, SymInt)
+DECLARE_SYMINT_OP(int32_t, SymInt) // make sure constants work
+DECLARE_SYMINT_OP(uint64_t, SymInt)
+DECLARE_SYMINT_OP(uint32_t, SymInt)
+DECLARE_SYMINT_OP(double, SymFloat)
+DECLARE_SYMINT_OP(float, SymFloat) // just for completeness
+
+// On OSX size_t is different than uint64_t so we have to
+// define it separately
+#if defined(__APPLE__)
+DECLARE_SYMINT_OP_INTONLY(size_t, SymInt)
+DECLARE_SYMINT_OP(size_t, SymInt)
+#endif
+
+#undef DECLARE_SYMINT_OP
+
+C10_API std::ostream& operator<<(std::ostream& os, const SymInt& s);
+C10_API SymInt operator-(const SymInt& s);
+
+inline bool sym_eq(int64_t a, int64_t b) {
+  return a == b;
+}
+
+inline SymBool sym_eq(const SymInt& a, const SymInt& b) {
+  return a.sym_eq(b);
+}
+
+inline bool sym_ne(int64_t a, int64_t b) {
+  return a != b;
+}
+
+inline SymBool sym_ne(const SymInt& a, const SymInt& b) {
+  return a.sym_ne(b);
+}
+
+inline bool sym_lt(int64_t a, int64_t b) {
+  return a < b;
+}
+
+inline SymBool sym_lt(const SymInt& a, const SymInt& b) {
+  return a.sym_lt(b);
+}
+
+inline bool sym_le(int64_t a, int64_t b) {
+  return a <= b;
+}
+
+inline SymBool sym_le(const SymInt& a, const SymInt& b) {
+  return a.sym_le(b);
+}
+
+inline bool sym_gt(int64_t a, int64_t b) {
+  return a > b;
+}
+
+inline SymBool sym_gt(const SymInt& a, const SymInt& b) {
+  return a.sym_gt(b);
+}
+
+inline bool sym_ge(int64_t a, int64_t b) {
+  return a >= b;
+}
+
+inline SymBool sym_ge(const SymInt& a, const SymInt& b) {
+  return a.sym_ge(b);
+}
+
+inline bool definitely_true(
+    const c10::SymBool& b,
+    const char* file,
+    int64_t line) {
+  return b.has_hint() && b.guard_bool(file, line);
+}
+
+} // namespace c10

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

@@ -0,0 +1,242 @@
+#pragma once
+
+#include <c10/macros/Export.h>
+#include <c10/util/ArrayRef.h>
+#include <c10/util/Exception.h>
+#include <c10/util/intrusive_ptr.h>
+#include <cstdint>
+#include <optional>
+#include <ostream>
+#include <string>
+
+C10_DIAGNOSTIC_PUSH_AND_IGNORED_IF_DEFINED("-Wunused-parameter")
+
+namespace c10 {
+
+class SymNodeImpl;
+using SymNode = c10::intrusive_ptr<SymNodeImpl>;
+
+// When you add a method, you also need to edit
+// torch/csrc/jit/python/init.cpp
+// torch/csrc/utils/python_symnode.h
+// c10/core/ConstantSymNodeImpl.h
+class C10_API SymNodeImpl : public c10::intrusive_ptr_target {
+ public:
+  ~SymNodeImpl() override = default;
+
+  template <typename T>
+  c10::intrusive_ptr<T> dyn_cast() const {
+    return c10::intrusive_ptr<T>::reclaim_copy(dynamic_cast<T*>(this));
+  }
+
+  // these could be pure virtual when we implement LTC versions
+  virtual bool is_int() {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual bool is_bool() {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual bool is_float() {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual bool is_nested_int() const {
+    return false;
+  }
+  virtual SymNode add(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode sub(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode mul(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  // NB: legacy, prefer float_truediv or int_truediv
+  virtual SymNode truediv(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode float_truediv(const SymNode& other) {
+    return truediv(other);
+  }
+  virtual SymNode int_truediv(const SymNode& other) {
+    return truediv(other);
+  }
+  // NB: legacy, prefer float_pow or pow_by_natural
+  virtual SymNode pow(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode float_pow(const SymNode& other) {
+    return pow(other);
+  }
+  virtual SymNode pow_by_natural(const SymNode& other) {
+    return pow(other);
+  }
+  // NB: legacy, prefer int_floordiv
+  virtual SymNode floordiv(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode int_floordiv(const SymNode& other) {
+    return floordiv(other);
+  }
+  virtual SymNode mod(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode eq(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode ne(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode gt(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode lt(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode le(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode ge(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode ceil() {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode floor() {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode neg() {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode sym_min(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode sym_max(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode sym_or(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode sym_and(const SymNode& other) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode sym_not() {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode sym_ite(const SymNode& then_val, const SymNode& else_val) {
+    TORCH_CHECK(false, "NYI");
+  };
+  // NB: self is ignored here, only the arguments are used
+  virtual SymNode is_contiguous(
+      ArrayRef<SymNode> sizes,
+      ArrayRef<SymNode> strides) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode is_channels_last_contiguous_2d(
+      ArrayRef<SymNode> sizes,
+      ArrayRef<SymNode> strides) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode is_channels_last_contiguous_3d(
+      ArrayRef<SymNode> sizes,
+      ArrayRef<SymNode> strides) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode is_channels_last_strides_2d(
+      ArrayRef<SymNode> sizes,
+      ArrayRef<SymNode> strides) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode is_channels_last_strides_3d(
+      ArrayRef<SymNode> sizes,
+      ArrayRef<SymNode> strides) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode is_non_overlapping_and_dense(
+      ArrayRef<SymNode> sizes,
+      ArrayRef<SymNode> strides) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode clone() {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode sym_float() {
+    TORCH_CHECK(false, "NYI");
+  }
+  virtual SymNode wrap_int(int64_t num) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode wrap_float(double num) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual SymNode wrap_bool(bool num) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual int64_t guard_int(const char* file, int64_t line) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual bool guard_bool(const char* file, int64_t line) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual double guard_float(const char* file, int64_t line) {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual bool guard_size_oblivious(const char* file, int64_t line) {
+    // No improvement for unbacked SymBools by default, replace this
+    // with a better implementation!
+    return guard_bool(file, line);
+  }
+  virtual bool expect_true(const char* file, int64_t line) {
+    // No improvement for unbacked SymBools by default, replace this
+    // with a better implementation!
+    return guard_bool(file, line);
+  };
+  virtual bool expect_size(const char* file, int64_t line) {
+    // No improvement for unbacked SymInts by default, replace this
+    // with a better implementation!
+    return ge(wrap_int(0))->guard_bool(file, line);
+  };
+  virtual int64_t int_() {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual bool bool_() {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual bool has_hint() {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual std::string str() {
+    TORCH_CHECK(false, "NYI");
+  };
+  virtual std::string _graph_repr() {
+    return str();
+  };
+  virtual std::optional<int64_t> nested_int() {
+    return std::nullopt;
+  }
+  virtual std::optional<int64_t> nested_int_coeff() {
+    return std::nullopt;
+  }
+  virtual std::optional<int64_t> constant_int() {
+    return std::nullopt;
+  }
+  virtual std::optional<bool> constant_bool() {
+    return std::nullopt;
+  }
+  virtual std::optional<int64_t> maybe_as_int() {
+    return std::nullopt;
+  }
+  virtual bool is_constant() {
+    return false;
+  }
+  virtual bool is_symbolic() {
+    return true;
+  }
+  std::ostream& operator<<(std::ostream& os) {
+    os << str();
+    return os;
+  }
+};
+
+} // namespace c10
+C10_DIAGNOSTIC_POP()

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

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <c10/core/SymInt.h>
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <cstdint>
+#include <utility>
+
+namespace c10 {
+
+namespace detail {
+// This template can only be specialized at int64_t and c10::SymInt;
+// you'll get linker errors otherwise
+template <typename T>
+C10_API T maybe_wrap_dim_slow(T dim, T dim_post_expr, bool wrap_scalar);
+} // namespace detail
+
+template <typename T>
+T _maybe_wrap_dim(T dim, T dim_post_expr, bool wrap_scalar = true) {
+  // Inline the fast paths
+  if (C10_LIKELY(dim_post_expr * -1 <= dim && dim < dim_post_expr)) {
+    // For SymInts, we want an explicit control flow to trigger a guard, so we
+    // may as well branch too.
+    if (dim < 0) {
+      return dim + dim_post_expr;
+    }
+    return dim;
+  }
+  // Check edge-cases out-of-line (wrapping scalars and out-of-bounds errors)
+  return c10::detail::maybe_wrap_dim_slow<T>(
+      std::move(dim), std::move(dim_post_expr), wrap_scalar);
+}
+
+inline int64_t maybe_wrap_dim(
+    int64_t dim,
+    int64_t dim_post_expr,
+    bool wrap_scalar = true) {
+  return _maybe_wrap_dim(dim, dim_post_expr, wrap_scalar);
+}
+
+inline c10::SymInt maybe_wrap_dim(
+    c10::SymInt dim,
+    c10::SymInt dim_post_expr,
+    bool wrap_scalar = true) {
+  return _maybe_wrap_dim(std::move(dim), std::move(dim_post_expr), wrap_scalar);
+}
+
+} // namespace c10

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

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <c10/macros/Macros.h>
+#include <c10/util/intrusive_ptr.h>
+
+namespace c10 {
+struct StorageImpl;
+class DataPtr;
+}; // namespace c10
+
+namespace c10::impl::cow {
+
+// Creates a Copy-on-write (COW) clone of the given storage. This will also
+// convert the given storage into a COW storage if it is not COW already.
+//
+// Converting the storage into a COW storage will not be successful if the
+// storage's DataPtr has some context (`DataPtr::get_context()`) which is not
+// equal to the data pointer (`DataPtr::get()`). In this case, a nullptr is
+// returned.
+C10_API c10::intrusive_ptr<StorageImpl> lazy_clone_storage(
+    StorageImpl& storage);
+
+// Check if a storage has a simple DataPtr with no abnormal context
+C10_API bool has_simple_data_ptr(const c10::StorageImpl& storage);
+
+// Check if a DataPtr is COW
+C10_API bool is_cow_data_ptr(const c10::DataPtr& data_ptr);
+
+// Eagerly copies a COW storage's data, turning it into a non-COW storage.
+C10_API void materialize_cow_storage(StorageImpl& storage);
+
+} // namespace c10::impl::cow

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

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <c10/core/impl/PyInterpreter.h>
+
+namespace c10::impl {
+
+struct C10_API GPUTrace {
+  // On the x86 architecture the atomic operations are lock-less.
+  static std::atomic<const PyInterpreter*> gpuTraceState;
+
+  // When PyTorch migrates to C++20, this should be changed to an atomic flag.
+  // Currently, the access to this variable is not synchronized, on the basis
+  // that it will only be flipped once and by the first interpreter that
+  // accesses it.
+  static bool haveState;
+
+  // This function will only register the first interpreter that tries to invoke
+  // it. For all of the next ones it will be a no-op.
+  static void set_trace(const PyInterpreter*);
+
+  static const PyInterpreter* get_trace() {
+    if (!haveState)
+      return nullptr;
+    return gpuTraceState.load(std::memory_order_acquire);
+  }
+};
+
+} // namespace c10::impl

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

@@ -0,0 +1,315 @@
+#pragma once
+
+#include <algorithm>
+#include <cstdint>
+
+#include <c10/macros/Macros.h>
+#include <c10/util/ArrayRef.h>
+#include <c10/util/SmallVector.h>
+
+#define C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE 5
+
+namespace c10::impl {
+
+// Packed container for TensorImpl sizes and strides.
+// This design improves on the previous approach of using a pair of
+// c10::SmallVector<int64_t, 5> by specializing for the operations we
+// actually use and enforcing that the number of sizes is the same as
+// the number of strides. The memory layout is as follows:
+//
+// 1 size_t for the size
+// 5 eightbytes of inline sizes and 5 eightbytes of inline strides, OR pointer
+// to out-of-line array
+class C10_API SizesAndStrides {
+ public:
+  // TODO: different iterator types for sizes & strides to prevent
+  // mixing the two accidentally.
+  using sizes_iterator = int64_t*;
+  using sizes_const_iterator = const int64_t*;
+  using strides_iterator = int64_t*;
+  using strides_const_iterator = const int64_t*;
+
+  // NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
+  SizesAndStrides() {
+    size_at_unchecked(0) = 0;
+    stride_at_unchecked(0) = 1;
+  }
+
+  ~SizesAndStrides() {
+    if (C10_UNLIKELY(!isInline())) {
+      // NOLINTNEXTLINE(cppcoreguidelines-no-malloc)
+      free(outOfLineStorage_);
+    }
+  }
+
+  // NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
+  SizesAndStrides(const SizesAndStrides& rhs) : size_(rhs.size_) {
+    if (C10_LIKELY(rhs.isInline())) {
+      copyDataInline(rhs);
+    } else {
+      allocateOutOfLineStorage(size_);
+      copyDataOutline(rhs);
+    }
+  }
+
+  SizesAndStrides& operator=(const SizesAndStrides& rhs) {
+    if (this == &rhs) {
+      return *this;
+    }
+    if (C10_LIKELY(rhs.isInline())) {
+      if (C10_UNLIKELY(!isInline())) {
+        // NOLINTNEXTLINE(cppcoreguidelines-no-malloc)
+        free(outOfLineStorage_);
+      }
+      copyDataInline(rhs);
+    } else {
+      if (isInline()) {
+        allocateOutOfLineStorage(rhs.size_);
+      } else {
+        resizeOutOfLineStorage(rhs.size_);
+      }
+      copyDataOutline(rhs);
+    }
+    size_ = rhs.size_;
+    return *this;
+  }
+
+  // Move from rhs. rhs.size() == 0 afterwards.
+  SizesAndStrides(SizesAndStrides&& rhs) noexcept : size_(rhs.size_) {
+    if (C10_LIKELY(isInline())) {
+      memcpy(inlineStorage_, rhs.inlineStorage_, sizeof(inlineStorage_));
+    } else {
+      outOfLineStorage_ = rhs.outOfLineStorage_;
+      rhs.outOfLineStorage_ = nullptr;
+    }
+
+    rhs.size_ = 0;
+  }
+
+  // Move from rhs. rhs.size() == 0 afterwards.
+  SizesAndStrides& operator=(SizesAndStrides&& rhs) noexcept {
+    if (this == &rhs) {
+      return *this;
+    }
+    if (C10_LIKELY(rhs.isInline())) {
+      if (C10_UNLIKELY(!isInline())) {
+        // NOLINTNEXTLINE(cppcoreguidelines-no-malloc)
+        free(outOfLineStorage_);
+      }
+      copyDataInline(rhs);
+    } else {
+      // They're outline. We're going to steal their vector.
+      if (!isInline()) {
+        // NOLINTNEXTLINE(cppcoreguidelines-no-malloc)
+        free(outOfLineStorage_);
+      }
+      outOfLineStorage_ = rhs.outOfLineStorage_;
+      rhs.outOfLineStorage_ = nullptr;
+    }
+    size_ = rhs.size_;
+    rhs.size_ = 0;
+
+    return *this;
+  }
+
+  size_t size() const noexcept {
+    return size_;
+  }
+
+  const int64_t* sizes_data() const noexcept {
+    if (C10_LIKELY(isInline())) {
+      return &inlineStorage_[0];
+    } else {
+      return &outOfLineStorage_[0];
+    }
+  }
+
+  int64_t* sizes_data() noexcept {
+    if (C10_LIKELY(isInline())) {
+      return &inlineStorage_[0];
+    } else {
+      return &outOfLineStorage_[0];
+    }
+  }
+
+  sizes_const_iterator sizes_begin() const noexcept {
+    return sizes_data();
+  }
+
+  sizes_iterator sizes_begin() noexcept {
+    return sizes_data();
+  }
+
+  sizes_const_iterator sizes_end() const noexcept {
+    return sizes_begin() + size();
+  }
+
+  sizes_iterator sizes_end() noexcept {
+    return sizes_begin() + size();
+  }
+
+  IntArrayRef sizes_arrayref() const noexcept {
+    return IntArrayRef{sizes_data(), size()};
+  }
+
+  void set_sizes(IntArrayRef newSizes) {
+    resize(newSizes.size());
+    std::copy(newSizes.begin(), newSizes.end(), sizes_begin());
+  }
+
+  void set_strides(IntArrayRef strides) {
+    TORCH_INTERNAL_ASSERT(strides.size() == size());
+    std::copy(strides.begin(), strides.end(), strides_begin());
+  }
+
+  const int64_t* strides_data() const noexcept {
+    if (C10_LIKELY(isInline())) {
+      return &inlineStorage_[C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE];
+    } else {
+      return &outOfLineStorage_[size()];
+    }
+  }
+
+  int64_t* strides_data() noexcept {
+    if (C10_LIKELY(isInline())) {
+      return &inlineStorage_[C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE];
+    } else {
+      return &outOfLineStorage_[size()];
+    }
+  }
+
+  strides_const_iterator strides_begin() const noexcept {
+    if (C10_LIKELY(isInline())) {
+      return &inlineStorage_[C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE];
+    } else {
+      return &outOfLineStorage_[size()];
+    }
+  }
+
+  strides_iterator strides_begin() noexcept {
+    if (C10_LIKELY(isInline())) {
+      return &inlineStorage_[C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE];
+    } else {
+      return &outOfLineStorage_[size()];
+    }
+  }
+
+  strides_const_iterator strides_end() const noexcept {
+    return strides_begin() + size();
+  }
+
+  strides_iterator strides_end() noexcept {
+    return strides_begin() + size();
+  }
+
+  IntArrayRef strides_arrayref() const noexcept {
+    return IntArrayRef{strides_data(), size()};
+  }
+
+  // Size accessors.
+  int64_t size_at(size_t idx) const noexcept {
+    assert(idx < size());
+    return sizes_data()[idx];
+  }
+
+  int64_t& size_at(size_t idx) noexcept {
+    assert(idx < size());
+    return sizes_data()[idx];
+  }
+
+  int64_t size_at_unchecked(size_t idx) const noexcept {
+    return sizes_data()[idx];
+  }
+
+  int64_t& size_at_unchecked(size_t idx) noexcept {
+    return sizes_data()[idx];
+  }
+
+  // Size accessors.
+  int64_t stride_at(size_t idx) const noexcept {
+    assert(idx < size());
+    return strides_data()[idx];
+  }
+
+  int64_t& stride_at(size_t idx) noexcept {
+    assert(idx < size());
+    return strides_data()[idx];
+  }
+
+  int64_t stride_at_unchecked(size_t idx) const noexcept {
+    return strides_data()[idx];
+  }
+
+  int64_t& stride_at_unchecked(size_t idx) noexcept {
+    return strides_data()[idx];
+  }
+
+  void resize(size_t newSize) {
+    const auto oldSize = size();
+    if (newSize == oldSize) {
+      return;
+    }
+    if (C10_LIKELY(
+            newSize <= C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE && isInline())) {
+      if (oldSize < newSize) {
+        const auto bytesToZero =
+            (newSize - oldSize) * sizeof(inlineStorage_[0]);
+        memset(&inlineStorage_[oldSize], 0, bytesToZero);
+        memset(
+            &inlineStorage_[C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE + oldSize],
+            0,
+            bytesToZero);
+      }
+      size_ = newSize;
+    } else {
+      resizeSlowPath(newSize, oldSize);
+    }
+  }
+
+  void resizeSlowPath(size_t newSize, size_t oldSize);
+
+ private:
+  bool isInline() const noexcept {
+    return size_ <= C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE;
+  }
+
+  void copyDataInline(const SizesAndStrides& rhs) {
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(rhs.isInline());
+    memcpy(inlineStorage_, rhs.inlineStorage_, sizeof(inlineStorage_));
+  }
+
+  static size_t storageBytes(size_t size) noexcept {
+    return size * 2 * sizeof(int64_t);
+  }
+
+  void allocateOutOfLineStorage(size_t size) {
+    // NOLINTNEXTLINE(cppcoreguidelines-no-malloc)
+    outOfLineStorage_ = static_cast<int64_t*>(malloc(storageBytes(size)));
+    TORCH_CHECK(
+        outOfLineStorage_,
+        "Could not allocate memory for Tensor SizesAndStrides!");
+  }
+
+  void resizeOutOfLineStorage(size_t newSize) {
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(!isInline());
+    outOfLineStorage_ = static_cast<int64_t*>(
+        // NOLINTNEXTLINE(cppcoreguidelines-no-malloc)
+        realloc(outOfLineStorage_, storageBytes(newSize)));
+    TORCH_CHECK(
+        outOfLineStorage_,
+        "Could not allocate memory for Tensor SizesAndStrides!");
+  }
+
+  void copyDataOutline(const SizesAndStrides& rhs) noexcept {
+    memcpy(outOfLineStorage_, rhs.outOfLineStorage_, storageBytes(rhs.size_));
+  }
+
+  size_t size_{1};
+  union {
+    int64_t* outOfLineStorage_;
+    // NOLINTNEXTLINE(*c-array*)
+    int64_t inlineStorage_[C10_SIZES_AND_STRIDES_MAX_INLINE_SIZE * 2]{};
+  };
+};
+
+} // namespace c10::impl

videochat2/lib/python3.10/site-packages/torch/include/c10/util/AbortHandler.h

@@ -0,0 +1,81 @@
+#include <c10/macros/Macros.h>
+#include <c10/util/Backtrace.h>
+#include <c10/util/env.h>
+#include <cstdlib>
+#include <exception>
+#include <iostream>
+#include <mutex>
+#include <optional>
+
+namespace c10 {
+class AbortHandlerHelper {
+ public:
+  static AbortHandlerHelper& getInstance() {
+#ifdef _WIN32
+    thread_local
+#endif // _WIN32
+        static AbortHandlerHelper instance;
+    return instance;
+  }
+
+  void set(std::terminate_handler handler) {
+    std::lock_guard<std::mutex> lk(mutex);
+    if (!inited) {
+      prev = std::set_terminate(handler);
+      curr = std::get_terminate();
+      inited = true;
+    }
+  }
+
+  std::terminate_handler getPrev() const {
+    return prev;
+  }
+
+ private:
+  std::terminate_handler prev = nullptr;
+  std::terminate_handler curr = nullptr;
+  bool inited = false;
+  std::mutex mutex;
+  AbortHandlerHelper() = default;
+  ~AbortHandlerHelper() {
+    // Only restore the handler if we are the current one
+    if (inited && curr == std::get_terminate()) {
+      std::set_terminate(prev);
+    }
+  }
+
+ public:
+  AbortHandlerHelper(AbortHandlerHelper const&) = delete;
+  void operator=(AbortHandlerHelper const&) = delete;
+};
+
+namespace detail {
+C10_ALWAYS_INLINE void terminate_handler() {
+  std::cout << "Unhandled exception caught in c10/util/AbortHandler.h" << '\n';
+  auto backtrace = get_backtrace();
+  std::cout << backtrace << '\n' << std::flush;
+  auto prev_handler = AbortHandlerHelper::getInstance().getPrev();
+  if (prev_handler) {
+    prev_handler();
+  } else {
+    std::abort();
+  }
+}
+} // namespace detail
+
+C10_ALWAYS_INLINE void set_terminate_handler() {
+  bool use_custom_terminate = false;
+  // On Windows it is enabled by default based on
+  // https://github.com/pytorch/pytorch/pull/50320#issuecomment-763147062
+#ifdef _WIN32
+  use_custom_terminate = true;
+#endif // _WIN32
+  auto result = c10::utils::check_env("TORCH_CUSTOM_TERMINATE");
+  if (result != std::nullopt) {
+    use_custom_terminate = result.value();
+  }
+  if (use_custom_terminate) {
+    AbortHandlerHelper::getInstance().set(detail::terminate_handler);
+  }
+}
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/ApproximateClock.h

@@ -0,0 +1,115 @@
+// Copyright 2023-present Facebook. All Rights Reserved.
+
+#pragma once
+
+#include <c10/macros/Export.h>
+#include <array>
+#include <chrono>
+#include <cstddef>
+#include <cstdint>
+#include <ctime>
+#include <functional>
+#include <type_traits>
+
+#if defined(C10_IOS) && defined(C10_MOBILE)
+#include <sys/time.h> // for gettimeofday()
+#endif
+
+#if defined(__i386__) || defined(__x86_64__) || defined(__amd64__)
+#define C10_RDTSC
+#if defined(_MSC_VER)
+#include <intrin.h>
+#elif defined(__CUDACC__) || defined(__HIPCC__)
+#undef C10_RDTSC
+#elif defined(__clang__)
+// `__rdtsc` is available by default.
+// NB: This has to be first, because Clang will also define `__GNUC__`
+#elif defined(__GNUC__)
+#include <x86intrin.h>
+#else
+#undef C10_RDTSC
+#endif
+#endif
+
+namespace c10 {
+
+using time_t = int64_t;
+using steady_clock_t = std::conditional_t<
+    std::chrono::high_resolution_clock::is_steady,
+    std::chrono::high_resolution_clock,
+    std::chrono::steady_clock>;
+
+inline time_t getTimeSinceEpoch() {
+  auto now = std::chrono::system_clock::now().time_since_epoch();
+  return std::chrono::duration_cast<std::chrono::nanoseconds>(now).count();
+}
+
+inline time_t getTime(bool allow_monotonic = false) {
+#if defined(C10_IOS) && defined(C10_MOBILE)
+  // clock_gettime is only available on iOS 10.0 or newer. Unlike OS X, iOS
+  // can't rely on CLOCK_REALTIME, as it is defined no matter if clock_gettime
+  // is implemented or not
+  struct timeval now;
+  gettimeofday(&now, NULL);
+  return static_cast<time_t>(now.tv_sec) * 1000000000 +
+      static_cast<time_t>(now.tv_usec) * 1000;
+#elif defined(_WIN32) || defined(__MACH__)
+  return std::chrono::duration_cast<std::chrono::nanoseconds>(
+             steady_clock_t::now().time_since_epoch())
+      .count();
+#else
+  // clock_gettime is *much* faster than std::chrono implementation on Linux
+  struct timespec t {};
+  auto mode = CLOCK_REALTIME;
+  if (allow_monotonic) {
+    mode = CLOCK_MONOTONIC;
+  }
+  clock_gettime(mode, &t);
+  return static_cast<time_t>(t.tv_sec) * 1000000000 +
+      static_cast<time_t>(t.tv_nsec);
+#endif
+}
+
+// We often do not need to capture true wall times. If a fast mechanism such
+// as TSC is available we can use that instead and convert back to epoch time
+// during post processing. This greatly reduce the clock's contribution to
+// profiling.
+//   http://btorpey.github.io/blog/2014/02/18/clock-sources-in-linux/
+//   https://quick-bench.com/q/r8opkkGZSJMu9wM_XTbDouq-0Io
+// TODO: We should use
+// `https://github.com/google/benchmark/blob/main/src/cycleclock.h`
+inline auto getApproximateTime() {
+#if defined(C10_RDTSC)
+  return static_cast<uint64_t>(__rdtsc());
+#else
+  return getTime();
+#endif
+}
+
+using approx_time_t = decltype(getApproximateTime());
+static_assert(
+    std::is_same_v<approx_time_t, int64_t> ||
+        std::is_same_v<approx_time_t, uint64_t>,
+    "Expected either int64_t (`getTime`) or uint64_t (some TSC reads).");
+
+// Convert `getCount` results to Nanoseconds since unix epoch.
+class C10_API ApproximateClockToUnixTimeConverter final {
+ public:
+  ApproximateClockToUnixTimeConverter();
+  std::function<time_t(approx_time_t)> makeConverter();
+
+  struct UnixAndApproximateTimePair {
+    time_t t_;
+    approx_time_t approx_t_;
+  };
+  static UnixAndApproximateTimePair measurePair();
+
+ private:
+  static constexpr size_t replicates = 1001;
+  using time_pairs = std::array<UnixAndApproximateTimePair, replicates>;
+  time_pairs measurePairs();
+
+  time_pairs start_times_;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/BFloat16.h

@@ -0,0 +1,133 @@
+#pragma once
+
+// Defines the bloat16 type (brain floating-point). This representation uses
+// 1 bit for the sign, 8 bits for the exponent and 7 bits for the mantissa.
+
+#include <c10/macros/Macros.h>
+#include <cmath>
+#include <cstdint>
+#include <cstring>
+#include <iosfwd>
+#include <ostream>
+
+#if defined(__CUDACC__) && !defined(USE_ROCM)
+#include <cuda_bf16.h>
+#endif
+#if defined(__HIPCC__) && defined(USE_ROCM)
+#include <hip/hip_bf16.h>
+#endif
+
+#if defined(SYCL_EXT_ONEAPI_BFLOAT16_MATH_FUNCTIONS)
+#if defined(CL_SYCL_LANGUAGE_VERSION)
+#include <CL/sycl.hpp> // for SYCL 1.2.1
+#else
+#include <sycl/sycl.hpp> // for SYCL 2020
+#endif
+#include <ext/oneapi/bfloat16.hpp>
+#endif
+
+namespace c10 {
+
+namespace detail {
+inline C10_HOST_DEVICE float f32_from_bits(uint16_t src) {
+  float res = 0;
+  uint32_t tmp = src;
+  tmp <<= 16;
+
+#if defined(USE_ROCM)
+  float* tempRes;
+
+  // We should be using memcpy in order to respect the strict aliasing rule
+  // but it fails in the HIP environment.
+  tempRes = reinterpret_cast<float*>(&tmp);
+  res = *tempRes;
+#else
+  std::memcpy(&res, &tmp, sizeof(tmp));
+#endif
+
+  return res;
+}
+
+inline C10_HOST_DEVICE uint16_t bits_from_f32(float src) {
+  uint32_t res = 0;
+
+#if defined(USE_ROCM)
+  // We should be using memcpy in order to respect the strict aliasing rule
+  // but it fails in the HIP environment.
+  uint32_t* tempRes = reinterpret_cast<uint32_t*>(&src);
+  res = *tempRes;
+#else
+  std::memcpy(&res, &src, sizeof(res));
+#endif
+
+  return res >> 16;
+}
+
+inline C10_HOST_DEVICE uint16_t round_to_nearest_even(float src) {
+#if defined(USE_ROCM)
+  if (src != src) {
+#elif defined(_MSC_VER)
+  if (isnan(src)) {
+#else
+  if (std::isnan(src)) {
+#endif
+    return UINT16_C(0x7FC0);
+  } else {
+    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
+    union {
+      uint32_t U32; // NOLINT(facebook-hte-BadMemberName)
+      float F32; // NOLINT(facebook-hte-BadMemberName)
+    };
+
+    F32 = src;
+    uint32_t rounding_bias = ((U32 >> 16) & 1) + UINT32_C(0x7FFF);
+    return static_cast<uint16_t>((U32 + rounding_bias) >> 16);
+  }
+}
+} // namespace detail
+
+struct alignas(2) BFloat16 {
+  uint16_t x;
+
+  // HIP wants __host__ __device__ tag, CUDA does not
+#if defined(USE_ROCM)
+  C10_HOST_DEVICE BFloat16() = default;
+#else
+  BFloat16() = default;
+#endif
+
+  struct from_bits_t {};
+  static constexpr C10_HOST_DEVICE from_bits_t from_bits() {
+    return from_bits_t();
+  }
+
+  constexpr C10_HOST_DEVICE BFloat16(unsigned short bits, from_bits_t)
+      : x(bits) {}
+  /* implicit */ inline C10_HOST_DEVICE BFloat16(float value);
+  inline C10_HOST_DEVICE operator float() const;
+
+#if defined(__CUDACC__) && !defined(USE_ROCM)
+  inline C10_HOST_DEVICE BFloat16(const __nv_bfloat16& value);
+  explicit inline C10_HOST_DEVICE operator __nv_bfloat16() const;
+#endif
+#if defined(__HIPCC__) && defined(USE_ROCM)
+  inline C10_HOST_DEVICE BFloat16(const __hip_bfloat16& value);
+  explicit inline C10_HOST_DEVICE operator __hip_bfloat16() const;
+#endif
+
+#if defined(SYCL_EXT_ONEAPI_BFLOAT16_MATH_FUNCTIONS)
+  inline C10_HOST_DEVICE BFloat16(const sycl::ext::oneapi::bfloat16& value);
+  explicit inline C10_HOST_DEVICE operator sycl::ext::oneapi::bfloat16() const;
+#endif
+};
+
+C10_API inline std::ostream& operator<<(
+    std::ostream& out,
+    const BFloat16& value) {
+  out << (float)value;
+  return out;
+}
+
+} // namespace c10
+
+#include <c10/util/BFloat16-inl.h> // IWYU pragma: keep

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Bitset.h

@@ -0,0 +1,116 @@
+#pragma once
+
+#include <cstddef>
+#if defined(_MSC_VER)
+#include <intrin.h>
+#endif
+
+namespace c10::utils {
+
+/**
+ * This is a simple bitset class with sizeof(long long int) bits.
+ * You can set bits, unset bits, query bits by index,
+ * and query for the first set bit.
+ * Before using this class, please also take a look at std::bitset,
+ * which has more functionality and is more generic. It is probably
+ * a better fit for your use case. The sole reason for c10::utils::bitset
+ * to exist is that std::bitset misses a find_first_set() method.
+ */
+struct bitset final {
+ private:
+#if defined(_MSC_VER)
+  // MSVCs _BitScanForward64 expects int64_t
+  using bitset_type = int64_t;
+#else
+  // POSIX ffsll expects long long int
+  using bitset_type = long long int;
+#endif
+ public:
+  static constexpr size_t NUM_BITS() {
+    return 8 * sizeof(bitset_type);
+  }
+
+  constexpr bitset() noexcept = default;
+  constexpr bitset(const bitset&) noexcept = default;
+  constexpr bitset(bitset&&) noexcept = default;
+  // there is an issure for gcc 5.3.0 when define default function as constexpr
+  // see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68754.
+  bitset& operator=(const bitset&) noexcept = default;
+  bitset& operator=(bitset&&) noexcept = default;
+
+  constexpr void set(size_t index) noexcept {
+    bitset_ |= (static_cast<long long int>(1) << index);
+  }
+
+  constexpr void unset(size_t index) noexcept {
+    bitset_ &= ~(static_cast<long long int>(1) << index);
+  }
+
+  constexpr bool get(size_t index) const noexcept {
+    return bitset_ & (static_cast<long long int>(1) << index);
+  }
+
+  constexpr bool is_entirely_unset() const noexcept {
+    return 0 == bitset_;
+  }
+
+  // Call the given functor with the index of each bit that is set
+  template <class Func>
+  void for_each_set_bit(Func&& func) const {
+    bitset cur = *this;
+    size_t index = cur.find_first_set();
+    while (0 != index) {
+      // -1 because find_first_set() is not one-indexed.
+      index -= 1;
+      func(index);
+      cur.unset(index);
+      index = cur.find_first_set();
+    }
+  }
+
+ private:
+  // Return the index of the first set bit. The returned index is one-indexed
+  // (i.e. if the very first bit is set, this function returns '1'), and a
+  // return of '0' means that there was no bit set.
+  size_t find_first_set() const {
+#if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_ARM64))
+    unsigned long result;
+    bool has_bits_set = (0 != _BitScanForward64(&result, bitset_));
+    if (!has_bits_set) {
+      return 0;
+    }
+    return result + 1;
+#elif defined(_MSC_VER) && defined(_M_IX86)
+    unsigned long result;
+    if (static_cast<uint32_t>(bitset_) != 0) {
+      bool has_bits_set =
+          (0 != _BitScanForward(&result, static_cast<uint32_t>(bitset_)));
+      if (!has_bits_set) {
+        return 0;
+      }
+      return result + 1;
+    } else {
+      bool has_bits_set =
+          (0 != _BitScanForward(&result, static_cast<uint32_t>(bitset_ >> 32)));
+      if (!has_bits_set) {
+        return 32;
+      }
+      return result + 33;
+    }
+#else
+    return __builtin_ffsll(bitset_);
+#endif
+  }
+
+  friend bool operator==(bitset lhs, bitset rhs) noexcept {
+    return lhs.bitset_ == rhs.bitset_;
+  }
+
+  bitset_type bitset_{0};
+};
+
+inline bool operator!=(bitset lhs, bitset rhs) noexcept {
+  return !(lhs == rhs);
+}
+
+} // namespace c10::utils

videochat2/lib/python3.10/site-packages/torch/include/c10/util/ConstexprCrc.h

@@ -0,0 +1,130 @@
+#pragma once
+
+#include <c10/util/IdWrapper.h>
+#include <c10/util/string_view.h>
+#include <cstddef>
+#include <cstdint>
+
+namespace c10::util {
+
+namespace detail {
+// NOLINTNEXTLINE(*c-arrays*)
+constexpr uint64_t crc64_table[] = {
+    0x0000000000000000, 0x7ad870c830358979, 0xf5b0e190606b12f2,
+    0x8f689158505e9b8b, 0xc038e5739841b68f, 0xbae095bba8743ff6,
+    0x358804e3f82aa47d, 0x4f50742bc81f2d04, 0xab28ecb46814fe75,
+    0xd1f09c7c5821770c, 0x5e980d24087fec87, 0x24407dec384a65fe,
+    0x6b1009c7f05548fa, 0x11c8790fc060c183, 0x9ea0e857903e5a08,
+    0xe478989fa00bd371, 0x7d08ff3b88be6f81, 0x07d08ff3b88be6f8,
+    0x88b81eabe8d57d73, 0xf2606e63d8e0f40a, 0xbd301a4810ffd90e,
+    0xc7e86a8020ca5077, 0x4880fbd87094cbfc, 0x32588b1040a14285,
+    0xd620138fe0aa91f4, 0xacf86347d09f188d, 0x2390f21f80c18306,
+    0x594882d7b0f40a7f, 0x1618f6fc78eb277b, 0x6cc0863448deae02,
+    0xe3a8176c18803589, 0x997067a428b5bcf0, 0xfa11fe77117cdf02,
+    0x80c98ebf2149567b, 0x0fa11fe77117cdf0, 0x75796f2f41224489,
+    0x3a291b04893d698d, 0x40f16bccb908e0f4, 0xcf99fa94e9567b7f,
+    0xb5418a5cd963f206, 0x513912c379682177, 0x2be1620b495da80e,
+    0xa489f35319033385, 0xde51839b2936bafc, 0x9101f7b0e12997f8,
+    0xebd98778d11c1e81, 0x64b116208142850a, 0x1e6966e8b1770c73,
+    0x8719014c99c2b083, 0xfdc17184a9f739fa, 0x72a9e0dcf9a9a271,
+    0x08719014c99c2b08, 0x4721e43f0183060c, 0x3df994f731b68f75,
+    0xb29105af61e814fe, 0xc849756751dd9d87, 0x2c31edf8f1d64ef6,
+    0x56e99d30c1e3c78f, 0xd9810c6891bd5c04, 0xa3597ca0a188d57d,
+    0xec09088b6997f879, 0x96d1784359a27100, 0x19b9e91b09fcea8b,
+    0x636199d339c963f2, 0xdf7adabd7a6e2d6f, 0xa5a2aa754a5ba416,
+    0x2aca3b2d1a053f9d, 0x50124be52a30b6e4, 0x1f423fcee22f9be0,
+    0x659a4f06d21a1299, 0xeaf2de5e82448912, 0x902aae96b271006b,
+    0x74523609127ad31a, 0x0e8a46c1224f5a63, 0x81e2d7997211c1e8,
+    0xfb3aa75142244891, 0xb46ad37a8a3b6595, 0xceb2a3b2ba0eecec,
+    0x41da32eaea507767, 0x3b024222da65fe1e, 0xa2722586f2d042ee,
+    0xd8aa554ec2e5cb97, 0x57c2c41692bb501c, 0x2d1ab4dea28ed965,
+    0x624ac0f56a91f461, 0x1892b03d5aa47d18, 0x97fa21650afae693,
+    0xed2251ad3acf6fea, 0x095ac9329ac4bc9b, 0x7382b9faaaf135e2,
+    0xfcea28a2faafae69, 0x8632586aca9a2710, 0xc9622c4102850a14,
+    0xb3ba5c8932b0836d, 0x3cd2cdd162ee18e6, 0x460abd1952db919f,
+    0x256b24ca6b12f26d, 0x5fb354025b277b14, 0xd0dbc55a0b79e09f,
+    0xaa03b5923b4c69e6, 0xe553c1b9f35344e2, 0x9f8bb171c366cd9b,
+    0x10e3202993385610, 0x6a3b50e1a30ddf69, 0x8e43c87e03060c18,
+    0xf49bb8b633338561, 0x7bf329ee636d1eea, 0x012b592653589793,
+    0x4e7b2d0d9b47ba97, 0x34a35dc5ab7233ee, 0xbbcbcc9dfb2ca865,
+    0xc113bc55cb19211c, 0x5863dbf1e3ac9dec, 0x22bbab39d3991495,
+    0xadd33a6183c78f1e, 0xd70b4aa9b3f20667, 0x985b3e827bed2b63,
+    0xe2834e4a4bd8a21a, 0x6debdf121b863991, 0x1733afda2bb3b0e8,
+    0xf34b37458bb86399, 0x8993478dbb8deae0, 0x06fbd6d5ebd3716b,
+    0x7c23a61ddbe6f812, 0x3373d23613f9d516, 0x49aba2fe23cc5c6f,
+    0xc6c333a67392c7e4, 0xbc1b436e43a74e9d, 0x95ac9329ac4bc9b5,
+    0xef74e3e19c7e40cc, 0x601c72b9cc20db47, 0x1ac40271fc15523e,
+    0x5594765a340a7f3a, 0x2f4c0692043ff643, 0xa02497ca54616dc8,
+    0xdafce7026454e4b1, 0x3e847f9dc45f37c0, 0x445c0f55f46abeb9,
+    0xcb349e0da4342532, 0xb1eceec59401ac4b, 0xfebc9aee5c1e814f,
+    0x8464ea266c2b0836, 0x0b0c7b7e3c7593bd, 0x71d40bb60c401ac4,
+    0xe8a46c1224f5a634, 0x927c1cda14c02f4d, 0x1d148d82449eb4c6,
+    0x67ccfd4a74ab3dbf, 0x289c8961bcb410bb, 0x5244f9a98c8199c2,
+    0xdd2c68f1dcdf0249, 0xa7f41839ecea8b30, 0x438c80a64ce15841,
+    0x3954f06e7cd4d138, 0xb63c61362c8a4ab3, 0xcce411fe1cbfc3ca,
+    0x83b465d5d4a0eece, 0xf96c151de49567b7, 0x76048445b4cbfc3c,
+    0x0cdcf48d84fe7545, 0x6fbd6d5ebd3716b7, 0x15651d968d029fce,
+    0x9a0d8ccedd5c0445, 0xe0d5fc06ed698d3c, 0xaf85882d2576a038,
+    0xd55df8e515432941, 0x5a3569bd451db2ca, 0x20ed197575283bb3,
+    0xc49581ead523e8c2, 0xbe4df122e51661bb, 0x3125607ab548fa30,
+    0x4bfd10b2857d7349, 0x04ad64994d625e4d, 0x7e7514517d57d734,
+    0xf11d85092d094cbf, 0x8bc5f5c11d3cc5c6, 0x12b5926535897936,
+    0x686de2ad05bcf04f, 0xe70573f555e26bc4, 0x9ddd033d65d7e2bd,
+    0xd28d7716adc8cfb9, 0xa85507de9dfd46c0, 0x273d9686cda3dd4b,
+    0x5de5e64efd965432, 0xb99d7ed15d9d8743, 0xc3450e196da80e3a,
+    0x4c2d9f413df695b1, 0x36f5ef890dc31cc8, 0x79a59ba2c5dc31cc,
+    0x037deb6af5e9b8b5, 0x8c157a32a5b7233e, 0xf6cd0afa9582aa47,
+    0x4ad64994d625e4da, 0x300e395ce6106da3, 0xbf66a804b64ef628,
+    0xc5bed8cc867b7f51, 0x8aeeace74e645255, 0xf036dc2f7e51db2c,
+    0x7f5e4d772e0f40a7, 0x05863dbf1e3ac9de, 0xe1fea520be311aaf,
+    0x9b26d5e88e0493d6, 0x144e44b0de5a085d, 0x6e963478ee6f8124,
+    0x21c640532670ac20, 0x5b1e309b16452559, 0xd476a1c3461bbed2,
+    0xaeaed10b762e37ab, 0x37deb6af5e9b8b5b, 0x4d06c6676eae0222,
+    0xc26e573f3ef099a9, 0xb8b627f70ec510d0, 0xf7e653dcc6da3dd4,
+    0x8d3e2314f6efb4ad, 0x0256b24ca6b12f26, 0x788ec2849684a65f,
+    0x9cf65a1b368f752e, 0xe62e2ad306bafc57, 0x6946bb8b56e467dc,
+    0x139ecb4366d1eea5, 0x5ccebf68aecec3a1, 0x2616cfa09efb4ad8,
+    0xa97e5ef8cea5d153, 0xd3a62e30fe90582a, 0xb0c7b7e3c7593bd8,
+    0xca1fc72bf76cb2a1, 0x45775673a732292a, 0x3faf26bb9707a053,
+    0x70ff52905f188d57, 0x0a2722586f2d042e, 0x854fb3003f739fa5,
+    0xff97c3c80f4616dc, 0x1bef5b57af4dc5ad, 0x61372b9f9f784cd4,
+    0xee5fbac7cf26d75f, 0x9487ca0fff135e26, 0xdbd7be24370c7322,
+    0xa10fceec0739fa5b, 0x2e675fb4576761d0, 0x54bf2f7c6752e8a9,
+    0xcdcf48d84fe75459, 0xb71738107fd2dd20, 0x387fa9482f8c46ab,
+    0x42a7d9801fb9cfd2, 0x0df7adabd7a6e2d6, 0x772fdd63e7936baf,
+    0xf8474c3bb7cdf024, 0x829f3cf387f8795d, 0x66e7a46c27f3aa2c,
+    0x1c3fd4a417c62355, 0x935745fc4798b8de, 0xe98f353477ad31a7,
+    0xa6df411fbfb21ca3, 0xdc0731d78f8795da, 0x536fa08fdfd90e51,
+    0x29b7d047efec8728,
+};
+
+inline C10_HOST_CONSTEXPR_EXCEPT_WIN_CUDA uint64_t
+crc64impl(uint64_t accumulator, const char* data, size_t size) {
+  for (size_t i = 0; i < size; ++i) {
+    accumulator =
+        crc64_table[(accumulator ^ data[i]) & 0xFF] ^ (accumulator >> 8);
+  }
+  return accumulator;
+}
+} // namespace detail
+
+struct crc64_t final : IdWrapper<crc64_t, uint64_t> {
+  constexpr crc64_t(uint64_t checksum) : IdWrapper(checksum) {}
+  constexpr uint64_t checksum() const {
+    return this->underlyingId();
+  }
+};
+
+// CRC64 with Jones coefficients and an init value of 0.
+inline C10_HOST_CONSTEXPR_EXCEPT_WIN_CUDA crc64_t
+crc64(const char* str, size_t size) {
+  return crc64_t{detail::crc64impl(0, str, size)};
+}
+
+inline C10_HOST_CONSTEXPR_EXCEPT_WIN_CUDA crc64_t crc64(c10::string_view str) {
+  return crc64(str.data(), str.size());
+}
+} // namespace c10::util
+
+// Allow usage of crc64_t in std::unordered_set
+C10_DEFINE_HASH_FOR_IDWRAPPER(c10::util::crc64_t);

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Exception.h

@@ -0,0 +1,714 @@
+#ifndef C10_UTIL_EXCEPTION_H_
+#define C10_UTIL_EXCEPTION_H_
+
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Backtrace.h>
+#include <c10/util/Lazy.h>
+#include <c10/util/StringUtil.h>
+
+#include <cstdint>
+#include <exception>
+#include <memory>
+#include <string>
+#include <variant>
+#include <vector>
+
+#if defined(_MSC_VER) && _MSC_VER <= 1900
+#define __func__ __FUNCTION__
+#endif
+
+namespace c10 {
+
+/// The primary ATen error class.
+/// Provides a complete error message with source location information via
+/// `what()`, and a more concise message via `what_without_backtrace()`.
+/// Don't throw this directly; use TORCH_CHECK/TORCH_INTERNAL_ASSERT instead.
+///
+/// NB: c10::Error is handled specially by the default torch to suppress the
+/// backtrace, see torch/csrc/Exceptions.h
+class C10_API Error : public std::exception {
+ private:
+  // The actual error message.
+  std::string msg_;
+
+  // Context for the message (in order of decreasing specificity).  Context will
+  // be automatically formatted appropriately, so it is not necessary to add
+  // extra leading/trailing newlines to strings inside this vector
+  std::vector<std::string> context_;
+
+  // The C++ backtrace at the point when this exception was raised.  This
+  // may be empty if there is no valid backtrace.  (We don't use optional
+  // here to reduce the dependencies this file has.)
+  Backtrace backtrace_;
+
+  // These two are derived fields from msg_stack_ and backtrace_, but we need
+  // fields for the strings so that we can return a const char* (as the
+  // signature of std::exception requires).  Currently, the invariant
+  // is that these fields are ALWAYS populated consistently with respect
+  // to msg_stack_ and backtrace_.
+  mutable OptimisticLazy<std::string> what_;
+  std::string what_without_backtrace_;
+
+  // This is a little debugging trick: you can stash a relevant pointer
+  // in caller, and then when you catch the exception, you can compare
+  // against pointers you have on hand to get more information about
+  // where the exception came from.  In Caffe2, this is used to figure
+  // out which operator raised an exception.
+  const void* caller_;
+
+ public:
+  // PyTorch-style Error constructor.  NB: the implementation of this
+  // is actually in Logging.cpp
+  Error(SourceLocation source_location, std::string msg);
+
+  // Caffe2-style error message
+  Error(
+      const char* file,
+      const uint32_t line,
+      const char* condition,
+      const std::string& msg,
+      Backtrace backtrace,
+      const void* caller = nullptr);
+
+  // Base constructor
+  Error(
+      std::string msg,
+      Backtrace backtrace = nullptr,
+      const void* caller = nullptr);
+
+  // Add some new context to the message stack.  The last added context
+  // will be formatted at the end of the context list upon printing.
+  // WARNING: This method is O(n) in the size of the stack, so don't go
+  // wild adding a ridiculous amount of context to error messages.
+  void add_context(std::string msg);
+
+  const std::string& msg() const {
+    return msg_;
+  }
+
+  const std::vector<std::string>& context() const {
+    return context_;
+  }
+
+  const Backtrace& backtrace() const;
+
+  /// Returns the complete error message, including the source location.
+  /// The returned pointer is invalidated if you call add_context() on
+  /// this object.
+  const char* what() const noexcept override;
+
+  const void* caller() const noexcept {
+    return caller_;
+  }
+
+  /// Returns only the error message string, without source location.
+  /// The returned pointer is invalidated if you call add_context() on
+  /// this object.
+  virtual const char* what_without_backtrace() const noexcept {
+    return what_without_backtrace_.c_str();
+  }
+
+ private:
+  void refresh_what();
+  std::string compute_what(bool include_backtrace) const;
+};
+
+class C10_API Warning {
+ public:
+  class C10_API UserWarning {};
+  class C10_API DeprecationWarning {};
+
+  using warning_variant_t = std::variant<UserWarning, DeprecationWarning>;
+
+  Warning(
+      warning_variant_t type,
+      const SourceLocation& source_location,
+      std::string msg,
+      bool verbatim);
+
+  Warning(
+      warning_variant_t type,
+      SourceLocation source_location,
+      const char* msg,
+      bool verbatim);
+
+  Warning(
+      warning_variant_t type,
+      SourceLocation source_location,
+      ::c10::detail::CompileTimeEmptyString msg,
+      bool verbatim);
+
+  // Getters for members
+  warning_variant_t type() const;
+  const SourceLocation& source_location() const;
+  const std::string& msg() const;
+  bool verbatim() const;
+
+ private:
+  // The type of warning
+  warning_variant_t type_;
+
+  // Where the warning happened.
+  SourceLocation source_location_;
+
+  // The actual warning message.
+  std::string msg_;
+
+  // See note: [Verbatim Warnings]
+  bool verbatim_;
+};
+
+using UserWarning = Warning::UserWarning;
+using DeprecationWarning = Warning::DeprecationWarning;
+
+// Issue a warning with a given message. Dispatched to the current
+// warning handler.
+void C10_API warn(const Warning& warning);
+
+class C10_API WarningHandler {
+ public:
+  virtual ~WarningHandler() = default;
+  /// The default warning handler. Prints the message to stderr.
+  virtual void process(const Warning& warning);
+};
+
+namespace WarningUtils {
+
+// Note: [Verbatim Warnings]
+// Warnings originating in C++ code can appear out-of-place to Python users:
+// a user runs a line in Python, but the warning references a line in C++.
+// Some parts of PyTorch, like the JIT, are cognizant of this mismatch
+// and take care to map warnings back to the user's program, but most
+// of PyTorch simply throws a context-free warning. To allow warning
+// handlers to add context where appropriate, warn takes the
+// "verbatim" flag. When this is false a warning handler might append
+// the C++ warning to a Python warning message that relates the warning
+// back to the user's program. Callers who have already accounted for
+// context in their warnings should set verbatim to true so their warnings
+// appear without modification.
+
+/// Sets the global warning handler. This is not thread-safe, so it should
+/// generally be called once during initialization or while holding the GIL
+/// for programs that use python.
+/// User is responsible for keeping the WarningHandler alive until
+/// it is not needed.
+C10_API void set_warning_handler(WarningHandler* handler) noexcept(true);
+/// Gets the global warning handler.
+C10_API WarningHandler* get_warning_handler() noexcept(true);
+
+class C10_API WarningHandlerGuard {
+  WarningHandler* prev_handler_;
+
+ public:
+  WarningHandlerGuard(WarningHandler* new_handler)
+      : prev_handler_(c10::WarningUtils::get_warning_handler()) {
+    c10::WarningUtils::set_warning_handler(new_handler);
+  }
+  ~WarningHandlerGuard() {
+    c10::WarningUtils::set_warning_handler(prev_handler_);
+  }
+};
+
+/// The TORCH_WARN_ONCE macro is difficult to test for. Use
+/// setWarnAlways(true) to turn it into TORCH_WARN, which can be
+/// tested for more easily.
+C10_API void set_warnAlways(bool) noexcept(true);
+C10_API bool get_warnAlways() noexcept(true);
+
+// A RAII guard that sets warn_always (not thread-local) on
+// construction, and sets it back to the original value upon destruction.
+struct C10_API WarnAlways {
+ public:
+  explicit WarnAlways(bool setting = true);
+  ~WarnAlways();
+
+ private:
+  bool prev_setting;
+};
+
+} // namespace WarningUtils
+
+// Like Error, but we always report the C++ backtrace, instead of only
+// reporting when TORCH_SHOW_CPP_STACKTRACES
+class C10_API ErrorAlwaysShowCppStacktrace : public Error {
+  using Error::Error;
+  const char* what_without_backtrace() const noexcept override {
+    return what();
+  }
+};
+
+// Used in ATen for out-of-bound indices that can reasonably only be detected
+// lazily inside a kernel (See: advanced indexing).  These turn into
+// IndexError when they cross to Python.
+class C10_API IndexError : public Error {
+  using Error::Error;
+};
+
+// Used in ATen for invalid values.  These turn into
+// ValueError when they cross to Python.
+class C10_API ValueError : public Error {
+  using Error::Error;
+};
+
+// Used in ATen for invalid types.  These turn into
+// TypeError when they cross to Python.
+class C10_API TypeError : public Error {
+  using Error::Error;
+};
+
+// Used in ATen for functionality that is not implemented.  These turn into
+// NotImplementedError when they cross to Python.
+class C10_API NotImplementedError : public Error {
+  using Error::Error;
+};
+
+// Used in ATen for non finite indices.  These turn into
+// ExitException when they cross to Python.
+class C10_API EnforceFiniteError : public Error {
+  using Error::Error;
+};
+
+// Used in Onnxifi backend lowering.  These turn into
+// ExitException when they cross to Python.
+class C10_API OnnxfiBackendSystemError : public Error {
+  using Error::Error;
+};
+
+// Used for numerical errors from the linalg module. These
+// turn into LinAlgError when they cross into Python.
+class C10_API LinAlgError : public Error {
+  using Error::Error;
+};
+
+class C10_API OutOfMemoryError : public Error {
+  using Error::Error;
+};
+
+// Base error type for all distributed errors.
+// These turn into DistError when they cross into Python.
+class C10_API DistError : public Error {
+  using Error::Error;
+};
+
+// Used for collective communication library errors from the distributed module.
+// These turn into DistBackendError when they cross into Python.
+class C10_API DistBackendError : public DistError {
+  using DistError::DistError;
+};
+
+// Used for errors originating from the store.
+// These turn into DistStoreError when they cross into Python.
+class C10_API DistStoreError : public DistError {
+  using DistError::DistError;
+};
+
+// Used for errors originating from the TCP/IP stack and not from collective
+// libraries. These turn into DistNetworkError when they cross into Python.
+class C10_API DistNetworkError : public DistError {
+  using DistError::DistError;
+};
+
+// A utility function to return an exception std::string by prepending its
+// exception type before its what() content
+C10_API std::string GetExceptionString(const std::exception& e);
+
+} // namespace c10
+
+// Private helper macro for implementing TORCH_INTERNAL_ASSERT and TORCH_CHECK
+//
+// Note: In the debug build With MSVC, __LINE__ might be of long type (a.k.a
+// int32_t), which is different from the definition of `SourceLocation` that
+// requires unsigned int (a.k.a uint32_t) and may cause a compile error with the
+// message: error C2397: conversion from 'long' to 'uint32_t' requires a
+// narrowing conversion Here the static cast is used to pass the build. if this
+// is used inside a lambda the __func__ macro expands to operator(), which isn't
+// very useful, but hard to fix in a macro so suppressing the warning.
+#define C10_THROW_ERROR(err_type, msg) \
+  throw ::c10::err_type(               \
+      {__func__, __FILE__, static_cast<uint32_t>(__LINE__)}, msg)
+
+#define C10_BUILD_ERROR(err_type, msg) \
+  ::c10::err_type({__func__, __FILE__, static_cast<uint32_t>(__LINE__)}, msg)
+
+// Private helper macro for workaround MSVC misexpansion of nested macro
+// invocations involving __VA_ARGS__.  See
+// https://stackoverflow.com/questions/5134523/msvc-doesnt-expand-va-args-correctly
+#define C10_EXPAND_MSVC_WORKAROUND(x) x
+
+// On nvcc, C10_UNLIKELY thwarts missing return statement analysis.  In cases
+// where the unlikely expression may be a constant, use this macro to ensure
+// return statement analysis keeps working (at the cost of not getting the
+// likely/unlikely annotation on nvcc).
+// https://github.com/pytorch/pytorch/issues/21418
+//
+// Currently, this is only used in the error reporting macros below.  If you
+// want to use it more generally, move me to Macros.h
+//
+// TODO: Brian Vaughan observed that we might be able to get this to work on
+// nvcc by writing some sort of C++ overload that distinguishes constexpr inputs
+// from non-constexpr.  Since there isn't any evidence that losing C10_UNLIKELY
+// in nvcc is causing us perf problems, this is not yet implemented, but this
+// might be an interesting piece of C++ code for an intrepid bootcamper to
+// write.
+#if defined(__CUDACC__)
+#define C10_UNLIKELY_OR_CONST(e) e
+#else
+#define C10_UNLIKELY_OR_CONST(e) C10_UNLIKELY(e)
+#endif
+
+// ----------------------------------------------------------------------------
+// Error reporting macros
+// ----------------------------------------------------------------------------
+
+#ifdef STRIP_ERROR_MESSAGES
+#define TORCH_RETHROW(e, ...) throw
+#else
+#define TORCH_RETHROW(e, ...)               \
+  do {                                      \
+    e.add_context(::c10::str(__VA_ARGS__)); \
+    throw;                                  \
+  } while (false)
+#endif
+
+// A utility macro to provide assert()-like functionality; that is, enforcement
+// of internal invariants in code.  It supports an arbitrary number of extra
+// arguments (evaluated only on failure), which will be printed in the assert
+// failure message using operator<< (this is useful to print some variables
+// which may be useful for debugging.)
+//
+// Usage:
+//    TORCH_INTERNAL_ASSERT(should_be_true);
+//    TORCH_INTERNAL_ASSERT(x == 0, "x = ", x);
+//
+// Assuming no bugs in PyTorch, the conditions tested by this macro should
+// always be true; e.g., it should be possible to disable all of these
+// conditions without changing observable user behavior.  If you would like to
+// do error reporting for user input, please use TORCH_CHECK instead.
+//
+// NOTE: It is SAFE to use this macro in production code; on failure, this
+// simply raises an exception, it does NOT unceremoniously quit the process
+// (unlike assert()).
+//
+#ifdef STRIP_ERROR_MESSAGES
+#define TORCH_INTERNAL_ASSERT(cond, ...)                              \
+  if (C10_UNLIKELY_OR_CONST(!(cond))) {                               \
+    ::c10::detail::torchCheckFail(                                    \
+        __func__,                                                     \
+        __FILE__,                                                     \
+        static_cast<uint32_t>(__LINE__),                              \
+        #cond " INTERNAL ASSERT FAILED at " C10_STRINGIZE(__FILE__)); \
+  }
+#else
+// It would be nice if we could build a combined string literal out of
+// the TORCH_INTERNAL_ASSERT prefix and a user-provided string literal
+// as the first argument, but there doesn't seem to be any good way to
+// do that while still supporting having a first argument that isn't a
+// string literal.
+#define TORCH_INTERNAL_ASSERT(cond, ...)                                         \
+  if (C10_UNLIKELY_OR_CONST(!(cond))) {                                          \
+    ::c10::detail::torchInternalAssertFail(                                      \
+        __func__,                                                                \
+        __FILE__,                                                                \
+        static_cast<uint32_t>(__LINE__),                                         \
+        #cond                                                                    \
+        " INTERNAL ASSERT FAILED at " C10_STRINGIZE(__FILE__) ":" C10_STRINGIZE( \
+            __LINE__) ", please report a bug to PyTorch. ",                      \
+        c10::str(__VA_ARGS__));                                                  \
+  }
+#endif
+
+// A utility macro to make it easier to test for error conditions from user
+// input.  Like TORCH_INTERNAL_ASSERT, it supports an arbitrary number of extra
+// arguments (evaluated only on failure), which will be printed in the error
+// message using operator<< (e.g., you can pass any object which has
+// operator<< defined.  Most objects in PyTorch have these definitions!)
+//
+// Usage:
+//    TORCH_CHECK(should_be_true); // A default error message will be provided
+//                                 // in this case; but we recommend writing an
+//                                 // explicit error message, as it is more
+//                                 // user friendly.
+//    TORCH_CHECK(x == 0, "Expected x to be 0, but got ", x);
+//
+// On failure, this macro will raise an exception.  If this exception propagates
+// to Python, it will convert into a Python RuntimeError.
+//
+// NOTE: It is SAFE to use this macro in production code; on failure, this
+// simply raises an exception, it does NOT unceremoniously quit the process
+// (unlike CHECK() from glog.)
+//
+#define TORCH_CHECK_WITH(error_t, cond, ...) \
+  TORCH_CHECK_WITH_MSG(error_t, cond, "", __VA_ARGS__)
+
+#ifdef STRIP_ERROR_MESSAGES
+#define TORCH_CHECK_MSG(cond, type, ...) \
+  (#cond #type " CHECK FAILED at " C10_STRINGIZE(__FILE__))
+#define TORCH_CHECK_WITH_MSG(error_t, cond, type, ...)                \
+  if (C10_UNLIKELY_OR_CONST(!(cond))) {                               \
+    C10_THROW_ERROR(Error, TORCH_CHECK_MSG(cond, type, __VA_ARGS__)); \
+  }
+#else
+
+namespace c10::detail {
+template <typename... Args>
+decltype(auto) torchCheckMsgImpl(const char* /*msg*/, const Args&... args) {
+  return ::c10::str(args...);
+}
+inline C10_API const char* torchCheckMsgImpl(const char* msg) {
+  return msg;
+}
+// If there is just 1 user-provided C-string argument, use it.
+inline C10_API const char* torchCheckMsgImpl(
+    const char* /*msg*/,
+    const char* args) {
+  return args;
+}
+} // namespace c10::detail
+
+#define TORCH_CHECK_MSG(cond, type, ...)                   \
+  (::c10::detail::torchCheckMsgImpl(                       \
+      "Expected " #cond                                    \
+      " to be true, but got false.  "                      \
+      "(Could this error message be improved?  If so, "    \
+      "please report an enhancement request to PyTorch.)", \
+      ##__VA_ARGS__))
+#define TORCH_CHECK_WITH_MSG(error_t, cond, type, ...)                  \
+  if (C10_UNLIKELY_OR_CONST(!(cond))) {                                 \
+    C10_THROW_ERROR(error_t, TORCH_CHECK_MSG(cond, type, __VA_ARGS__)); \
+  }
+#endif
+
+namespace c10::detail {
+
+[[noreturn]] C10_API void torchCheckFail(
+    const char* func,
+    const char* file,
+    uint32_t line,
+    const std::string& msg);
+[[noreturn]] C10_API void torchCheckFail(
+    const char* func,
+    const char* file,
+    uint32_t line,
+    const char* msg);
+
+// The c10::str() call that creates userMsg can have 1 of 3 return
+// types depending on the number and types of arguments passed to
+// TORCH_INTERNAL_ASSERT.  0 arguments will get a
+// CompileTimeEmptyString, 1 const char * will be passed straight
+// through, and anything else will get converted to std::string.
+[[noreturn]] C10_API void torchInternalAssertFail(
+    const char* func,
+    const char* file,
+    uint32_t line,
+    const char* condMsg,
+    const char* userMsg);
+[[noreturn]] inline C10_API void torchInternalAssertFail(
+    const char* func,
+    const char* file,
+    uint32_t line,
+    const char* condMsg,
+    ::c10::detail::CompileTimeEmptyString /*userMsg*/) {
+  torchCheckFail(func, file, line, condMsg);
+}
+[[noreturn]] C10_API void torchInternalAssertFail(
+    const char* func,
+    const char* file,
+    uint32_t line,
+    const char* condMsg,
+    const std::string& userMsg);
+
+} // namespace c10::detail
+
+#ifdef STRIP_ERROR_MESSAGES
+#define TORCH_CHECK(cond, ...)                   \
+  if (C10_UNLIKELY_OR_CONST(!(cond))) {          \
+    ::c10::detail::torchCheckFail(               \
+        __func__,                                \
+        __FILE__,                                \
+        static_cast<uint32_t>(__LINE__),         \
+        TORCH_CHECK_MSG(cond, "", __VA_ARGS__)); \
+  }
+#else
+#define TORCH_CHECK(cond, ...)                     \
+  if (C10_UNLIKELY_OR_CONST(!(cond))) {            \
+    ::c10::detail::torchCheckFail(                 \
+        __func__,                                  \
+        __FILE__,                                  \
+        static_cast<uint32_t>(__LINE__),           \
+        TORCH_CHECK_MSG(cond, "", ##__VA_ARGS__)); \
+  }
+#endif
+
+// An utility macro that does what `TORCH_CHECK` does if compiled in the host
+// code, otherwise does nothing. Supposed to be used in the code shared between
+// host and device code as an alternative for `TORCH_CHECK`.
+#if defined(__CUDACC__) || defined(__HIPCC__)
+#define TORCH_CHECK_IF_NOT_ON_CUDA(cond, ...)
+#else
+#define TORCH_CHECK_IF_NOT_ON_CUDA(cond, ...) TORCH_CHECK(cond, ##__VA_ARGS__)
+#endif
+
+// Debug only version of TORCH_INTERNAL_ASSERT. This macro only checks in debug
+// build, and does nothing in release build.  It is appropriate to use
+// in situations where you want to add an assert to a hotpath, but it is
+// too expensive to run this assert on production builds.
+#ifdef NDEBUG
+// Optimized version - generates no code.
+#define TORCH_INTERNAL_ASSERT_DEBUG_ONLY(...) \
+  while (false)                               \
+  C10_EXPAND_MSVC_WORKAROUND(TORCH_INTERNAL_ASSERT(__VA_ARGS__))
+#else
+#define TORCH_INTERNAL_ASSERT_DEBUG_ONLY(...) \
+  C10_EXPAND_MSVC_WORKAROUND(TORCH_INTERNAL_ASSERT(__VA_ARGS__))
+#endif
+
+// TODO: We're going to get a lot of similar looking string literals
+// this way; check if this actually affects binary size.
+
+// Like TORCH_CHECK, but raises LinAlgError instead of Error.
+#define TORCH_CHECK_LINALG(cond, ...) \
+  TORCH_CHECK_WITH_MSG(LinAlgError, cond, "LINALG", __VA_ARGS__)
+
+// Like TORCH_CHECK, but raises IndexErrors instead of Errors.
+#define TORCH_CHECK_INDEX(cond, ...) \
+  TORCH_CHECK_WITH_MSG(IndexError, cond, "INDEX", __VA_ARGS__)
+
+// Like TORCH_CHECK, but raises ValueErrors instead of Errors.
+#define TORCH_CHECK_VALUE(cond, ...) \
+  TORCH_CHECK_WITH_MSG(ValueError, cond, "VALUE", __VA_ARGS__)
+
+// Like TORCH_CHECK, but raises TypeErrors instead of Errors.
+#define TORCH_CHECK_TYPE(cond, ...) \
+  TORCH_CHECK_WITH_MSG(TypeError, cond, "TYPE", __VA_ARGS__)
+
+// Like TORCH_CHECK, but raises NotImplementedErrors instead of Errors.
+#define TORCH_CHECK_NOT_IMPLEMENTED(cond, ...) \
+  TORCH_CHECK_WITH_MSG(NotImplementedError, cond, "TYPE", __VA_ARGS__)
+
+#define TORCH_CHECK_ALWAYS_SHOW_CPP_STACKTRACE(cond, ...) \
+  TORCH_CHECK_WITH_MSG(                                   \
+      ErrorAlwaysShowCppStacktrace, cond, "TYPE", ##__VA_ARGS__)
+
+#ifdef STRIP_ERROR_MESSAGES
+#define WARNING_MESSAGE_STRING(...) \
+  ::c10::detail::CompileTimeEmptyString {}
+#else
+#define WARNING_MESSAGE_STRING(...) ::c10::str(__VA_ARGS__)
+#endif
+
+// Report a warning to the user.  Accepts an arbitrary number of extra
+// arguments which are concatenated into the warning message using operator<<
+//
+#ifdef DISABLE_WARN
+#define _TORCH_WARN_WITH(...) ((void)0);
+#else
+#define _TORCH_WARN_WITH(warning_t, ...)                     \
+  ::c10::warn(::c10::Warning(                                \
+      warning_t(),                                           \
+      {__func__, __FILE__, static_cast<uint32_t>(__LINE__)}, \
+      WARNING_MESSAGE_STRING(__VA_ARGS__),                   \
+      false));
+#endif
+
+#define TORCH_WARN(...) _TORCH_WARN_WITH(::c10::UserWarning, __VA_ARGS__);
+
+#define TORCH_WARN_DEPRECATION(...) \
+  _TORCH_WARN_WITH(::c10::DeprecationWarning, __VA_ARGS__);
+
+// Report a warning to the user only once.  Accepts an arbitrary number of extra
+// arguments which are concatenated into the warning message using operator<<
+//
+#define _TORCH_WARN_ONCE(...)                                             \
+  C10_UNUSED static const auto C10_ANONYMOUS_VARIABLE(torch_warn_once_) = \
+      [&] {                                                               \
+        TORCH_WARN(__VA_ARGS__);                                          \
+        return true;                                                      \
+      }()
+
+#ifdef DISABLE_WARN
+#define TORCH_WARN_ONCE(...) ((void)0);
+#else
+#define TORCH_WARN_ONCE(...)                   \
+  if (::c10::WarningUtils::get_warnAlways()) { \
+    TORCH_WARN(__VA_ARGS__);                   \
+  } else {                                     \
+    _TORCH_WARN_ONCE(__VA_ARGS__);             \
+  }
+#endif
+
+// Report an error with a specific argument
+// NOTE: using the argument name in TORCH_CHECK's message is preferred
+#define TORCH_CHECK_ARG(cond, argN, ...) \
+  TORCH_CHECK(cond, "invalid argument ", argN, ": ", __VA_ARGS__)
+
+// ----------------------------------------------------------------------------
+// Deprecated macros
+// ----------------------------------------------------------------------------
+
+namespace c10::detail {
+
+/*
+// Deprecation disabled until we fix sites in our codebase
+C10_DEPRECATED_MESSAGE("AT_ERROR(msg) is deprecated, use TORCH_CHECK(false, msg)
+instead.")
+*/
+inline void deprecated_AT_ERROR() {}
+
+/*
+// Deprecation disabled until we fix sites in our codebase
+C10_DEPRECATED_MESSAGE("AT_ASSERT is deprecated, if you mean to indicate an
+internal invariant failure, use " \
+                       "TORCH_INTERNAL_ASSERT instead; if you mean to do user
+error checking, use " \ "TORCH_CHECK.  See
+https://github.com/pytorch/pytorch/issues/20287 for more details.")
+*/
+inline void deprecated_AT_ASSERT() {}
+
+/*
+// Deprecation disabled until we fix sites in our codebase
+C10_DEPRECATED_MESSAGE("AT_ASSERTM is deprecated, if you mean to indicate an
+internal invariant failure, use " \
+                       "TORCH_INTERNAL_ASSERT instead; if you mean to do user
+error checking, use " \ "TORCH_CHECK.  See
+https://github.com/pytorch/pytorch/issues/20287 for more details.")
+*/
+inline void deprecated_AT_ASSERTM() {}
+
+} // namespace c10::detail
+
+// Deprecated alias; this alias was deprecated because people kept mistakenly
+// using it for user error checking.  Use TORCH_INTERNAL_ASSERT or TORCH_CHECK
+// instead. See https://github.com/pytorch/pytorch/issues/20287 for more
+// details.
+#define AT_ASSERT(...)                                              \
+  do {                                                              \
+    ::c10::detail::deprecated_AT_ASSERT();                          \
+    C10_EXPAND_MSVC_WORKAROUND(TORCH_INTERNAL_ASSERT(__VA_ARGS__)); \
+  } while (false)
+
+// Deprecated alias, like AT_ASSERT.  The new TORCH_INTERNAL_ASSERT macro
+// supports both 0-ary and variadic calls, so having a separate
+// message-accepting macro is not necessary.
+//
+// NB: we MUST include cond explicitly here, as MSVC will miscompile the macro
+// expansion, shunting all of __VA_ARGS__ to cond.  An alternate workaround
+// can be seen at
+// https://stackoverflow.com/questions/5134523/msvc-doesnt-expand-va-args-correctly
+#define AT_ASSERTM(cond, ...)                                             \
+  do {                                                                    \
+    ::c10::detail::deprecated_AT_ASSERTM();                               \
+    C10_EXPAND_MSVC_WORKAROUND(TORCH_INTERNAL_ASSERT(cond, __VA_ARGS__)); \
+  } while (false)
+
+// Deprecated alias; this alias was deprecated because it represents extra API
+// surface that makes it hard for people to understand what macro to use.
+// Use TORCH_CHECK(false, ...) or TORCH_INTERNAL_ASSERT(false, ...) to
+// unconditionally fail at a line of code.
+#define AT_ERROR(...)                                                        \
+  do {                                                                       \
+    ::c10::detail::deprecated_AT_ERROR();                                    \
+    C10_EXPAND_MSVC_WORKAROUND(TORCH_CHECK(false, ::c10::str(__VA_ARGS__))); \
+  } while (false)
+
+#endif // C10_UTIL_EXCEPTION_H_

videochat2/lib/python3.10/site-packages/torch/include/c10/util/ExclusivelyOwned.h

@@ -0,0 +1,140 @@
+#pragma once
+
+#include <utility>
+
+namespace c10 {
+
+// See example implementation in TensorBase.h and TensorBody.h.
+// Synopsis:
+//
+// repr_type -- type to use to store an owned T in ExclusivelyOwned.
+//
+// pointer_type -- pointer-esque type to return from
+// ExclusivelyOwned's get() and operator*() methods.
+//
+// const_pointer_type -- similar to pointer_type, used for the const methods.
+//
+// static repr_type nullRepr() -- return a null instance of repr_type.
+//
+// template <class... Args>
+// static repr_type createInPlace(Args&&... args) -- used by the in-place
+// ExclusivelyOwned constructor.
+//
+// static repr_type moveToRepr(T&& x) -- move the given x into an
+// instance of repr_type. used by the ExclusivelyOwned(T&&)
+// constructor.
+//
+// static void destroyOwned(repr_type x) -- free memory for a
+// known-exclusively-owned instance of x. Replaces calling repr_type's
+// destructor. Being able to implement this more efficiently than
+// repr_type's destructor is the main reason to use ExclusivelyOwned
+// for a type.
+//
+// static T take(repr_type&) -- move out of the given repr_type into an owned T.
+//
+// static pointer_type getImpl(const repr_type&) -- return a pointer
+// to the given repr_type. May take repr_type by value if that is more
+// efficient.
+template <typename T>
+struct ExclusivelyOwnedTraits;
+
+/// ExclusivelyOwned is a smart-pointer-like wrapper around an
+/// exclusively-owned instance of some type T that normally has
+/// mandatory reference counting (currently just Tensor). If you have
+/// an isolated piece of code that knows that it has sole ownership of
+/// an object of one of these types (i.e., because you created it
+/// directly or using a factory function) and that object will not
+/// escape from that isolated piece of code, then moving the object
+/// into an ExclusivelyOwned will avoid an atomic reference count
+/// decrement at destruction time.
+///
+/// If you directly create the Tensor in the first
+/// place, you can use the in_place constructor of ExclusivelyOwned to
+/// additionally avoid doing any stores to initialize the refcount &
+/// weakcount.
+template <typename T>
+class ExclusivelyOwned {
+  using EOT = ExclusivelyOwnedTraits<T>;
+  typename ExclusivelyOwnedTraits<T>::repr_type repr_;
+
+ public:
+  ExclusivelyOwned() : repr_(EOT::nullRepr()) {}
+
+  explicit ExclusivelyOwned(T&& t) : repr_(EOT::moveToRepr(std::move(t))) {}
+
+  template <class... Args>
+  explicit ExclusivelyOwned(std::in_place_t, Args&&... args)
+      : repr_(EOT::createInPlace(std::forward<Args>(args)...)) {}
+
+  ExclusivelyOwned(const ExclusivelyOwned&) = delete;
+
+  ExclusivelyOwned(ExclusivelyOwned&& rhs) noexcept
+      : repr_(std::move(rhs.repr_)) {
+    rhs.repr_ = EOT::nullRepr();
+  }
+
+  ExclusivelyOwned& operator=(const ExclusivelyOwned&) = delete;
+
+  ExclusivelyOwned& operator=(ExclusivelyOwned&& rhs) noexcept {
+    EOT::destroyOwned(repr_);
+    repr_ = std::move(rhs.repr_);
+    rhs.repr_ = EOT::nullRepr();
+    return *this;
+  }
+
+  ExclusivelyOwned& operator=(T&& rhs) noexcept {
+    EOT::destroyOwned(repr_);
+    repr_ = EOT::moveToRepr(std::move(rhs));
+    return *this;
+  }
+
+  ~ExclusivelyOwned() {
+    EOT::destroyOwned(repr_);
+    // Don't bother to call the destructor of repr_, since we already
+    // did specialized destruction for the exclusively-owned case in
+    // destroyOwned!
+  }
+
+  // We don't provide this because it would require us to be able to
+  // differentiate an owned-but-empty T from a lack of T. This is
+  // particularly problematic for Tensor, which wants to use an
+  // undefined Tensor as its null state.
+  explicit operator bool() const noexcept = delete;
+
+  operator T() && {
+    return take();
+  }
+
+  // NOTE: the equivalent operation on MaybeOwned is a moving
+  // operator*. For ExclusivelyOwned, take() and operator*() may well
+  // have different return types, so they are different functions.
+  T take() && {
+    return EOT::take(repr_);
+  }
+
+  typename EOT::const_pointer_type operator->() const {
+    return get();
+  }
+
+  typename EOT::const_pointer_type get() const {
+    return EOT::getImpl(repr_);
+  }
+
+  typename EOT::pointer_type operator->() {
+    return get();
+  }
+
+  typename EOT::pointer_type get() {
+    return EOT::getImpl(repr_);
+  }
+
+  std::remove_pointer_t<typename EOT::const_pointer_type>& operator*() const {
+    return *get();
+  }
+
+  std::remove_pointer_t<typename EOT::pointer_type>& operator*() {
+    return *get();
+  }
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/ExclusivelyOwnedTensorTraits.h

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <c10/core/TensorImpl.h>
+#include <c10/core/UndefinedTensorImpl.h>
+
+#include <utility>
+
+namespace c10 {
+// Shared ExclusivelyOwnedTraits implementation between caffe2::Tensor and
+// at::TensorBase.
+template <typename TensorType>
+struct ExclusivelyOwnedTensorTraits {
+  using repr_type = TensorType;
+  using pointer_type = TensorType*;
+  using const_pointer_type = const TensorType*;
+
+  static repr_type nullRepr() {
+    return TensorType();
+  }
+
+  template <class... Args>
+  static repr_type createInPlace(Args&&... args) {
+    return TensorType(std::forward<Args>(args)...);
+  }
+
+  static repr_type moveToRepr(TensorType&& x) {
+    return std::move(x);
+  }
+
+  static void destroyOwned(TensorType& x) {
+    TensorImpl* const toDestroy = x.unsafeReleaseTensorImpl();
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
+        toDestroy != nullptr, "Tensor somehow got null TensorImpl?");
+    // May be 0 because UndefinedTensorImpl doesn't get its refcount
+    // incremented.
+    const bool isUndefined = toDestroy == UndefinedTensorImpl::singleton();
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
+        toDestroy->refcount_ == 1 || (toDestroy->refcount_ == 0 && isUndefined),
+        "ExclusivelyOwned<Tensor> destroyed with isUndefined ",
+        isUndefined,
+        " and refcount ",
+        toDestroy->refcount_,
+        ", expected 1 or, if isUndefined, 0!");
+    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
+        toDestroy->weakcount_ == 1 ||
+            (toDestroy->weakcount_ == 0 &&
+             toDestroy == UndefinedTensorImpl::singleton()),
+        "ExclusivelyOwned<Tensor> destroyed with isUndefined ",
+        isUndefined,
+        " and weakcount ",
+        toDestroy->weakcount_,
+        ", expected 1 or, if isUndefined, 0!");
+    if (!isUndefined) {
+#ifndef NDEBUG
+      // Needed to pass the debug assertions in ~intrusive_ptr_target.
+      toDestroy->refcount_ = 0;
+      toDestroy->weakcount_ = 0;
+#endif
+      delete toDestroy;
+    }
+  }
+
+  static TensorType take(TensorType& 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/util/Float8_e4m3fn-inl.h

@@ -0,0 +1,274 @@
+#pragma once
+
+#include <c10/macros/Macros.h>
+#include <cstdint>
+#include <limits>
+
+C10_CLANG_DIAGNOSTIC_PUSH()
+#if C10_CLANG_HAS_WARNING("-Wimplicit-int-float-conversion")
+C10_CLANG_DIAGNOSTIC_IGNORE("-Wimplicit-int-float-conversion")
+#endif
+
+namespace c10 {
+
+/// Constructors
+
+inline C10_HOST_DEVICE Float8_e4m3fn::Float8_e4m3fn(float value)
+    : x(detail::fp8e4m3fn_from_fp32_value(value)) {}
+
+/// Implicit conversions
+
+inline C10_HOST_DEVICE Float8_e4m3fn::operator float() const {
+  return detail::fp8e4m3fn_to_fp32_value(x);
+}
+
+/// Special values helper
+
+inline C10_HOST_DEVICE bool Float8_e4m3fn::isnan() const {
+  return (x & 0b01111111) == 0b01111111;
+}
+
+/// Arithmetic
+
+inline C10_HOST_DEVICE Float8_e4m3fn
+operator+(const Float8_e4m3fn& a, const Float8_e4m3fn& b) {
+  return static_cast<float>(a) + static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn
+operator-(const Float8_e4m3fn& a, const Float8_e4m3fn& b) {
+  return static_cast<float>(a) - static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn
+operator*(const Float8_e4m3fn& a, const Float8_e4m3fn& b) {
+  return static_cast<float>(a) * static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn operator/(
+    const Float8_e4m3fn& a,
+    const Float8_e4m3fn& b) __ubsan_ignore_float_divide_by_zero__ {
+  return static_cast<float>(a) / static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn operator-(const Float8_e4m3fn& a) {
+  return -static_cast<float>(a);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn& operator+=(
+    Float8_e4m3fn& a,
+    const Float8_e4m3fn& b) {
+  a = a + b;
+  return a;
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn& operator-=(
+    Float8_e4m3fn& a,
+    const Float8_e4m3fn& b) {
+  a = a - b;
+  return a;
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn& operator*=(
+    Float8_e4m3fn& a,
+    const Float8_e4m3fn& b) {
+  a = a * b;
+  return a;
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn& operator/=(
+    Float8_e4m3fn& a,
+    const Float8_e4m3fn& b) {
+  a = a / b;
+  return a;
+}
+
+/// Arithmetic with floats
+
+inline C10_HOST_DEVICE float operator+(Float8_e4m3fn a, float b) {
+  return static_cast<float>(a) + b;
+}
+inline C10_HOST_DEVICE float operator-(Float8_e4m3fn a, float b) {
+  return static_cast<float>(a) - b;
+}
+inline C10_HOST_DEVICE float operator*(Float8_e4m3fn a, float b) {
+  return static_cast<float>(a) * b;
+}
+inline C10_HOST_DEVICE float operator/(Float8_e4m3fn a, float b)
+    __ubsan_ignore_float_divide_by_zero__ {
+  return static_cast<float>(a) / b;
+}
+
+inline C10_HOST_DEVICE float operator+(float a, Float8_e4m3fn b) {
+  return a + static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float operator-(float a, Float8_e4m3fn b) {
+  return a - static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float operator*(float a, Float8_e4m3fn b) {
+  return a * static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float operator/(float a, Float8_e4m3fn b)
+    __ubsan_ignore_float_divide_by_zero__ {
+  return a / static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE float& operator+=(float& a, const Float8_e4m3fn& b) {
+  return a += static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float& operator-=(float& a, const Float8_e4m3fn& b) {
+  return a -= static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float& operator*=(float& a, const Float8_e4m3fn& b) {
+  return a *= static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float& operator/=(float& a, const Float8_e4m3fn& b) {
+  return a /= static_cast<float>(b);
+}
+
+/// Arithmetic with doubles
+
+inline C10_HOST_DEVICE double operator+(Float8_e4m3fn a, double b) {
+  return static_cast<double>(a) + b;
+}
+inline C10_HOST_DEVICE double operator-(Float8_e4m3fn a, double b) {
+  return static_cast<double>(a) - b;
+}
+inline C10_HOST_DEVICE double operator*(Float8_e4m3fn a, double b) {
+  return static_cast<double>(a) * b;
+}
+inline C10_HOST_DEVICE double operator/(Float8_e4m3fn a, double b)
+    __ubsan_ignore_float_divide_by_zero__ {
+  return static_cast<double>(a) / b;
+}
+
+inline C10_HOST_DEVICE double operator+(double a, Float8_e4m3fn b) {
+  return a + static_cast<double>(b);
+}
+inline C10_HOST_DEVICE double operator-(double a, Float8_e4m3fn b) {
+  return a - static_cast<double>(b);
+}
+inline C10_HOST_DEVICE double operator*(double a, Float8_e4m3fn b) {
+  return a * static_cast<double>(b);
+}
+inline C10_HOST_DEVICE double operator/(double a, Float8_e4m3fn b)
+    __ubsan_ignore_float_divide_by_zero__ {
+  return a / static_cast<double>(b);
+}
+
+/// Arithmetic with ints
+
+inline C10_HOST_DEVICE Float8_e4m3fn operator+(Float8_e4m3fn a, int b) {
+  return a + static_cast<Float8_e4m3fn>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator-(Float8_e4m3fn a, int b) {
+  return a - static_cast<Float8_e4m3fn>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator*(Float8_e4m3fn a, int b) {
+  return a * static_cast<Float8_e4m3fn>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator/(Float8_e4m3fn a, int b) {
+  return a / static_cast<Float8_e4m3fn>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn operator+(int a, Float8_e4m3fn b) {
+  return static_cast<Float8_e4m3fn>(a) + b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator-(int a, Float8_e4m3fn b) {
+  return static_cast<Float8_e4m3fn>(a) - b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator*(int a, Float8_e4m3fn b) {
+  return static_cast<Float8_e4m3fn>(a) * b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator/(int a, Float8_e4m3fn b) {
+  return static_cast<Float8_e4m3fn>(a) / b;
+}
+
+//// Arithmetic with int64_t
+
+inline C10_HOST_DEVICE Float8_e4m3fn operator+(Float8_e4m3fn a, int64_t b) {
+  return a + static_cast<Float8_e4m3fn>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator-(Float8_e4m3fn a, int64_t b) {
+  return a - static_cast<Float8_e4m3fn>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator*(Float8_e4m3fn a, int64_t b) {
+  return a * static_cast<Float8_e4m3fn>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator/(Float8_e4m3fn a, int64_t b) {
+  return a / static_cast<Float8_e4m3fn>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fn operator+(int64_t a, Float8_e4m3fn b) {
+  return static_cast<Float8_e4m3fn>(a) + b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator-(int64_t a, Float8_e4m3fn b) {
+  return static_cast<Float8_e4m3fn>(a) - b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator*(int64_t a, Float8_e4m3fn b) {
+  return static_cast<Float8_e4m3fn>(a) * b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fn operator/(int64_t a, Float8_e4m3fn b) {
+  return static_cast<Float8_e4m3fn>(a) / b;
+}
+
+/// NOTE: we do not define comparisons directly and instead rely on the implicit
+/// conversion from c10::Float8_e4m3fn to float.
+
+} // namespace c10
+
+namespace std {
+
+template <>
+class numeric_limits<c10::Float8_e4m3fn> {
+ public:
+  static constexpr bool is_specialized = true;
+  static constexpr bool is_signed = true;
+  static constexpr bool is_integer = false;
+  static constexpr bool is_exact = false;
+  static constexpr bool has_infinity = false;
+  static constexpr bool has_quiet_NaN = true;
+  static constexpr bool has_signaling_NaN = false;
+  static constexpr auto has_denorm = true;
+  static constexpr auto has_denorm_loss = true;
+  static constexpr auto round_style = numeric_limits<float>::round_style;
+  static constexpr bool is_iec559 = false;
+  static constexpr bool is_bounded = true;
+  static constexpr bool is_modulo = false;
+  static constexpr int digits = 4;
+  static constexpr int digits10 = 0;
+  static constexpr int max_digits10 = 3;
+  static constexpr int radix = 2;
+  static constexpr int min_exponent = -5;
+  static constexpr int min_exponent10 = -1;
+  static constexpr int max_exponent = 8;
+  static constexpr int max_exponent10 = 2;
+  static constexpr auto traps = numeric_limits<float>::traps;
+  static constexpr auto tinyness_before = false;
+
+  static constexpr c10::Float8_e4m3fn min() {
+    return c10::Float8_e4m3fn(0x08, c10::Float8_e4m3fn::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fn lowest() {
+    return c10::Float8_e4m3fn(0xFE, c10::Float8_e4m3fn::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fn max() {
+    return c10::Float8_e4m3fn(0x7E, c10::Float8_e4m3fn::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fn epsilon() {
+    return c10::Float8_e4m3fn(0x20, c10::Float8_e4m3fn::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fn round_error() {
+    return c10::Float8_e4m3fn(0x30, c10::Float8_e4m3fn::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fn quiet_NaN() {
+    return c10::Float8_e4m3fn(0x7F, c10::Float8_e4m3fn::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fn denorm_min() {
+    return c10::Float8_e4m3fn(0x01, c10::Float8_e4m3fn::from_bits());
+  }
+};
+
+} // namespace std
+
+C10_CLANG_DIAGNOSTIC_POP()

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Float8_e4m3fnuz-inl.h

@@ -0,0 +1,279 @@
+#pragma once
+
+#include <c10/macros/Macros.h>
+#include <c10/util/Float8_fnuz_cvt.h>
+#include <cstring>
+#include <limits>
+
+C10_CLANG_DIAGNOSTIC_PUSH()
+#if C10_CLANG_HAS_WARNING("-Wimplicit-int-float-conversion")
+C10_CLANG_DIAGNOSTIC_IGNORE("-Wimplicit-int-float-conversion")
+#endif
+
+namespace c10 {
+
+/// Constructors
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz::Float8_e4m3fnuz(float value)
+    : x(detail::fp8e4m3fnuz_from_fp32_value(value)) {}
+
+/// Implicit conversions
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz::operator float() const {
+  return detail::fp8_fnuz_to_fp32_value<4, 3>(x);
+}
+
+/// Special values helper
+
+inline C10_HOST_DEVICE bool Float8_e4m3fnuz::isnan() const {
+  return x == 0b10000000;
+}
+
+/// Arithmetic
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz
+operator+(const Float8_e4m3fnuz& a, const Float8_e4m3fnuz& b) {
+  return static_cast<float>(a) + static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz
+operator-(const Float8_e4m3fnuz& a, const Float8_e4m3fnuz& b) {
+  return static_cast<float>(a) - static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz
+operator*(const Float8_e4m3fnuz& a, const Float8_e4m3fnuz& b) {
+  return static_cast<float>(a) * static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator/(
+    const Float8_e4m3fnuz& a,
+    const Float8_e4m3fnuz& b) __ubsan_ignore_float_divide_by_zero__ {
+  return static_cast<float>(a) / static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator-(const Float8_e4m3fnuz& a) {
+  return -static_cast<float>(a);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz& operator+=(
+    Float8_e4m3fnuz& a,
+    const Float8_e4m3fnuz& b) {
+  a = a + b;
+  return a;
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz& operator-=(
+    Float8_e4m3fnuz& a,
+    const Float8_e4m3fnuz& b) {
+  a = a - b;
+  return a;
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz& operator*=(
+    Float8_e4m3fnuz& a,
+    const Float8_e4m3fnuz& b) {
+  a = a * b;
+  return a;
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz& operator/=(
+    Float8_e4m3fnuz& a,
+    const Float8_e4m3fnuz& b) {
+  a = a / b;
+  return a;
+}
+
+/// Arithmetic with floats
+
+inline C10_HOST_DEVICE float operator+(Float8_e4m3fnuz a, float b) {
+  return static_cast<float>(a) + b;
+}
+inline C10_HOST_DEVICE float operator-(Float8_e4m3fnuz a, float b) {
+  return static_cast<float>(a) - b;
+}
+inline C10_HOST_DEVICE float operator*(Float8_e4m3fnuz a, float b) {
+  return static_cast<float>(a) * b;
+}
+inline C10_HOST_DEVICE float operator/(Float8_e4m3fnuz a, float b)
+    __ubsan_ignore_float_divide_by_zero__ {
+  return static_cast<float>(a) / b;
+}
+
+inline C10_HOST_DEVICE float operator+(float a, Float8_e4m3fnuz b) {
+  return a + static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float operator-(float a, Float8_e4m3fnuz b) {
+  return a - static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float operator*(float a, Float8_e4m3fnuz b) {
+  return a * static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float operator/(float a, Float8_e4m3fnuz b)
+    __ubsan_ignore_float_divide_by_zero__ {
+  return a / static_cast<float>(b);
+}
+
+inline C10_HOST_DEVICE float& operator+=(float& a, const Float8_e4m3fnuz& b) {
+  return a += static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float& operator-=(float& a, const Float8_e4m3fnuz& b) {
+  return a -= static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float& operator*=(float& a, const Float8_e4m3fnuz& b) {
+  return a *= static_cast<float>(b);
+}
+inline C10_HOST_DEVICE float& operator/=(float& a, const Float8_e4m3fnuz& b) {
+  return a /= static_cast<float>(b);
+}
+
+/// Arithmetic with doubles
+
+inline C10_HOST_DEVICE double operator+(Float8_e4m3fnuz a, double b) {
+  return static_cast<double>(a) + b;
+}
+inline C10_HOST_DEVICE double operator-(Float8_e4m3fnuz a, double b) {
+  return static_cast<double>(a) - b;
+}
+inline C10_HOST_DEVICE double operator*(Float8_e4m3fnuz a, double b) {
+  return static_cast<double>(a) * b;
+}
+inline C10_HOST_DEVICE double operator/(Float8_e4m3fnuz a, double b)
+    __ubsan_ignore_float_divide_by_zero__ {
+  return static_cast<double>(a) / b;
+}
+
+inline C10_HOST_DEVICE double operator+(double a, Float8_e4m3fnuz b) {
+  return a + static_cast<double>(b);
+}
+inline C10_HOST_DEVICE double operator-(double a, Float8_e4m3fnuz b) {
+  return a - static_cast<double>(b);
+}
+inline C10_HOST_DEVICE double operator*(double a, Float8_e4m3fnuz b) {
+  return a * static_cast<double>(b);
+}
+inline C10_HOST_DEVICE double operator/(double a, Float8_e4m3fnuz b)
+    __ubsan_ignore_float_divide_by_zero__ {
+  return a / static_cast<double>(b);
+}
+
+/// Arithmetic with ints
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator+(Float8_e4m3fnuz a, int b) {
+  return a + static_cast<Float8_e4m3fnuz>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator-(Float8_e4m3fnuz a, int b) {
+  return a - static_cast<Float8_e4m3fnuz>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator*(Float8_e4m3fnuz a, int b) {
+  return a * static_cast<Float8_e4m3fnuz>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator/(Float8_e4m3fnuz a, int b) {
+  return a / static_cast<Float8_e4m3fnuz>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator+(int a, Float8_e4m3fnuz b) {
+  return static_cast<Float8_e4m3fnuz>(a) + b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator-(int a, Float8_e4m3fnuz b) {
+  return static_cast<Float8_e4m3fnuz>(a) - b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator*(int a, Float8_e4m3fnuz b) {
+  return static_cast<Float8_e4m3fnuz>(a) * b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator/(int a, Float8_e4m3fnuz b) {
+  return static_cast<Float8_e4m3fnuz>(a) / b;
+}
+
+//// Arithmetic with int64_t
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator+(Float8_e4m3fnuz a, int64_t b) {
+  return a + static_cast<Float8_e4m3fnuz>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator-(Float8_e4m3fnuz a, int64_t b) {
+  return a - static_cast<Float8_e4m3fnuz>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator*(Float8_e4m3fnuz a, int64_t b) {
+  return a * static_cast<Float8_e4m3fnuz>(b);
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator/(Float8_e4m3fnuz a, int64_t b) {
+  return a / static_cast<Float8_e4m3fnuz>(b);
+}
+
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator+(int64_t a, Float8_e4m3fnuz b) {
+  return static_cast<Float8_e4m3fnuz>(a) + b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator-(int64_t a, Float8_e4m3fnuz b) {
+  return static_cast<Float8_e4m3fnuz>(a) - b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator*(int64_t a, Float8_e4m3fnuz b) {
+  return static_cast<Float8_e4m3fnuz>(a) * b;
+}
+inline C10_HOST_DEVICE Float8_e4m3fnuz operator/(int64_t a, Float8_e4m3fnuz b) {
+  return static_cast<Float8_e4m3fnuz>(a) / b;
+}
+
+/// NOTE: we do not define comparisons directly and instead rely on the implicit
+/// conversion from c10::Float8_e4m3fnuz to float.
+
+} // namespace c10
+
+namespace std {
+
+template <>
+class numeric_limits<c10::Float8_e4m3fnuz> {
+ public:
+  static constexpr bool is_specialized = true;
+  static constexpr bool is_signed = true;
+  static constexpr bool is_integer = false;
+  static constexpr bool is_exact = false;
+  static constexpr bool has_infinity = false;
+  static constexpr bool has_quiet_NaN = true;
+  static constexpr bool has_signaling_NaN = false;
+  static constexpr auto has_denorm = true;
+  static constexpr auto has_denorm_loss = true;
+  static constexpr auto round_style = numeric_limits<float>::round_style;
+  static constexpr bool is_iec559 = false;
+  static constexpr bool is_bounded = true;
+  static constexpr bool is_modulo = false;
+  static constexpr int digits = 4;
+  static constexpr int digits10 = 0;
+  static constexpr int max_digits10 = 3;
+  static constexpr int radix = 2;
+  static constexpr int min_exponent = -6;
+  static constexpr int min_exponent10 = -1;
+  static constexpr int max_exponent = 8;
+  static constexpr int max_exponent10 = 2;
+  static constexpr auto traps = numeric_limits<float>::traps;
+  static constexpr auto tinyness_before = false;
+
+  static constexpr c10::Float8_e4m3fnuz min() {
+    return c10::Float8_e4m3fnuz(0x08, c10::Float8_e4m3fnuz::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fnuz lowest() {
+    return c10::Float8_e4m3fnuz(0xFF, c10::Float8_e4m3fnuz::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fnuz max() {
+    return c10::Float8_e4m3fnuz(0x7F, c10::Float8_e4m3fnuz::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fnuz epsilon() {
+    return c10::Float8_e4m3fnuz(0x28, c10::Float8_e4m3fnuz::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fnuz round_error() {
+    return c10::Float8_e4m3fnuz(0x38, c10::Float8_e4m3fnuz::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fnuz infinity() {
+    // NaN (no infinities)
+    return c10::Float8_e4m3fnuz(0x80, c10::Float8_e4m3fnuz::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fnuz quiet_NaN() {
+    return c10::Float8_e4m3fnuz(0x80, c10::Float8_e4m3fnuz::from_bits());
+  }
+  static constexpr c10::Float8_e4m3fnuz denorm_min() {
+    return c10::Float8_e4m3fnuz(0x01, c10::Float8_e4m3fnuz::from_bits());
+  }
+};
+
+} // namespace std
+
+C10_CLANG_DIAGNOSTIC_POP()

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Float8_e5m2.h

@@ -0,0 +1,148 @@
+#pragma once
+
+/// Defines the Float8_e5m2 type (8-bit floating-point) including conversions
+/// to standard C types and basic arithmetic operations. Note that arithmetic
+/// operations are implemented by converting to floating point and
+/// performing the operation in float32.
+/// Binary configuration:
+/// s eeeee mm
+/// 1 sign bit
+/// 5 exponent bits
+/// 2 mantissa bits
+/// bias = 15
+///
+/// Implementation based on the paper https://arxiv.org/pdf/2209.05433.pdf
+/// and inspired by Half implementation from pytorch/c10/util/Half.h
+
+#include <c10/util/Half.h>
+
+namespace c10 {
+
+namespace detail {
+
+/*
+ * Convert a 8-bit floating-point number in fp8 E5M2 format, in bit
+ * representation, to a 32-bit floating-point number in IEEE single-precision
+ * format, in bit representation.
+ *
+ * @note The implementation doesn't use any floating-point operations.
+ */
+inline C10_HOST_DEVICE float fp8e5m2_to_fp32_value(uint8_t input) {
+  /*
+   * Extend the fp8 E5M2 number to 32 bits and shift to the
+   * upper part of the 32-bit word:
+   *      +---+----+---+-----------------------------+
+   *      | S |EEEEE|MM|0000 0000 0000 0000 0000 0000|
+   *      +---+----+---+-----------------------------+
+   * Bits  31 26-30 24-25          0-23
+   *
+   * S - sign bit, E - bits of the biased exponent, M - bits of the mantissa, 0
+   * - zero bits.
+   */
+  uint16_t half_representation = input;
+  half_representation <<= 8;
+  return fp16_ieee_to_fp32_value(half_representation);
+}
+
+/*
+ * Convert a 32-bit floating-point number in IEEE single-precision format to a
+ * 8-bit floating-point number in fp8 E5M2 format, in bit representation.
+ */
+inline C10_HOST_DEVICE uint8_t fp8e5m2_from_fp32_value(float f) {
+  /*
+   * Binary representation of fp32 infinity
+   * 0 11111111 00000000000000000000000
+   */
+  constexpr uint32_t fp32_inf = UINT32_C(255) << 23;
+
+  /*
+   * Binary representation of 65536.0f, which is the first value
+   * not representable in fp8e5m2 range:
+   * 0 11111 00 - fp8e5m2
+   * 0 10001111 00000000000000000000000 - fp32
+   */
+  constexpr uint32_t fp8_max = UINT32_C(143) << 23;
+
+  /*
+   * A mask for converting fp32 numbers lower than fp8e5m2 normal range
+   * into denorm representation
+   * magic number: ((127 - 15) + (23 - 2) + 1)
+   */
+  constexpr uint32_t denorm_mask = UINT32_C(134) << 23;
+
+  uint32_t f_bits = fp32_to_bits(f);
+  uint8_t result = 0u;
+
+  /*
+   * Extract the sign of the input number into the high bit of the 32-bit word:
+   *
+   *      +---+----------------------------------+
+   *      | S |0000000 00000000 00000000 00000000|
+   *      +---+----------------------------------+
+   * Bits  31                 0-31
+   */
+  const uint32_t sign = f_bits & UINT32_C(0x80000000);
+
+  /*
+   * Set sign bit to 0
+   */
+  f_bits ^= sign;
+
+  if (f_bits >= fp8_max) {
+    // NaN - all exponent and mantissa bits set to 1
+    result = f_bits > fp32_inf ? UINT8_C(0x7F) : UINT8_C(0x7C);
+  } else {
+    if (f_bits < (UINT32_C(113) << 23)) {
+      // Input number is smaller than 2^(-14), which is the smallest
+      // fp8e5m2 normal number
+      f_bits =
+          fp32_to_bits(fp32_from_bits(f_bits) + fp32_from_bits(denorm_mask));
+      result = static_cast<uint8_t>(f_bits - denorm_mask);
+    } else {
+      // resulting mantissa is odd
+      uint32_t mant_odd = (f_bits >> 21) & 1;
+
+      // update exponent, rounding bias part 1
+      f_bits += ((uint32_t)(15 - 127) << 23) + 0xFFFFF;
+
+      // rounding bias part 2
+      f_bits += mant_odd;
+
+      // take the bits!
+      result = static_cast<uint8_t>(f_bits >> 21);
+    }
+  }
+
+  result |= static_cast<uint8_t>(sign >> 24);
+  return result;
+}
+
+} // namespace detail
+
+struct alignas(1) Float8_e5m2 {
+  uint8_t x;
+
+  struct from_bits_t {};
+  C10_HOST_DEVICE static constexpr from_bits_t from_bits() {
+    return from_bits_t();
+  }
+
+  Float8_e5m2() = default;
+
+  constexpr C10_HOST_DEVICE Float8_e5m2(uint8_t bits, from_bits_t) : x(bits) {}
+  inline C10_HOST_DEVICE Float8_e5m2(float value);
+  inline C10_HOST_DEVICE operator float() const;
+  inline C10_HOST_DEVICE bool isnan() const;
+  inline C10_HOST_DEVICE bool isinf() const;
+};
+
+C10_API inline std::ostream& operator<<(
+    std::ostream& out,
+    const Float8_e5m2& value) {
+  out << (float)value;
+  return out;
+}
+
+} // namespace c10
+
+#include <c10/util/Float8_e5m2-inl.h> // IWYU pragma: keep

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Float8_e5m2fnuz.h

@@ -0,0 +1,138 @@
+#pragma once
+
+/// Defines the Float8_e5m2fnuz type (8-bit floating-point) including
+/// conversions to standard C types and basic arithmetic operations. Note that
+/// arithmetic operations are implemented by converting to floating point and
+/// performing the operation in float32.
+/// Binary configuration remains the same as e5m2:
+/// s eeeee mm
+/// 1 sign bit
+/// 5 exponent bits
+/// 2 mantissa bits
+/// The key differences that e5m2fnuz brings are:
+/// bias = 16
+/// no infinities or negative zero
+/// NaN only when sign bit is 1, rest all 0s
+///
+/// Implementation based on the paper https://arxiv.org/pdf/2206.02915.pdf and
+/// the existing Float8_e4m3fn implementation.
+
+#include <c10/macros/Macros.h>
+#include <c10/util/TypeSafeSignMath.h>
+#include <c10/util/floating_point_utils.h>
+
+#if defined(__cplusplus)
+#include <cstdint>
+#elif !defined(__OPENCL_VERSION__)
+#include <math.h>
+#include <stdint.h>
+#endif
+
+#include <iosfwd>
+#include <ostream>
+
+namespace c10 {
+
+namespace detail {
+
+/*
+ * Convert a 32-bit floating-point number in IEEE single-precision format to a
+ * 8-bit floating-point number in fp8 E5M2 format, in bit representation.
+ */
+inline C10_HOST_DEVICE uint8_t fp8e5m2fnuz_from_fp32_value(float f) {
+  /*
+   * Binary representation of 65536.0f, which is the first value not
+   * representable (i.e. the first value which would overflow in to the sign
+   * bit, resulting in a NaN) in fp8e4m3fnuz range:
+   * 1 00000 00 - fp8e5m2fnuz
+   * 0 10001111 00000000000000000000000 - fp32
+   */
+  constexpr uint32_t fnuz_max = UINT32_C(0x8F) << 23;
+
+  /*
+   * A mask for converting fp32 numbers lower than fp8e5m2fnuz normal range
+   * into denormalized representation.
+   * magic number: ((127 - 16) + (23 - 2) + 1)
+   */
+  constexpr uint32_t denorm_mask = UINT32_C(0x85) << 23;
+
+  uint32_t f_bits = fp32_to_bits(f);
+  uint32_t result = 0u;
+
+  /*
+   * Extract the sign of the input number into the high bit of the 32-bit word:
+   *
+   *      +---+----------------------------------+
+   *      | S |0000000 00000000 00000000 00000000|
+   *      +---+----------------------------------+
+   * Bits  31                 0-31
+   */
+  const uint32_t sign = f_bits & UINT32_C(0x80000000);
+
+  /*
+   * Set sign bit to 0
+   */
+  f_bits ^= sign;
+
+  if (f_bits >= fnuz_max) {
+    // NaN -- sign bit set to 1, rest 0s
+    return 0x80;
+  }
+
+  if (f_bits < (UINT32_C(0x70) << 23) /* 2^-15 in float32 */) {
+    // Input exponent is less than -15, the smallest e5m2fnuz exponent, so the
+    // number will become subnormal.
+    f_bits = fp32_to_bits(fp32_from_bits(f_bits) + fp32_from_bits(denorm_mask));
+    result = static_cast<uint8_t>(f_bits - denorm_mask);
+    if (result == 0) {
+      // fnuz types don't have negative zero.
+      return 0;
+    }
+  } else {
+    // resulting mantissa is odd
+    uint8_t mant_odd = (f_bits >> 21) & 1;
+
+    // update exponent, rounding bias part 1
+    f_bits += ((uint32_t)(16 - 127) << 23) + 0xFFFFF;
+
+    // rounding bias part 2
+    f_bits += mant_odd;
+
+    // take the bits!
+    result = static_cast<uint8_t>(f_bits >> 21);
+  }
+
+  result |= sign >> 24;
+  return result;
+}
+
+} // namespace detail
+
+struct alignas(1) Float8_e5m2fnuz {
+  uint8_t x;
+
+  struct from_bits_t {};
+  C10_HOST_DEVICE static constexpr from_bits_t from_bits() {
+    return from_bits_t();
+  }
+
+  Float8_e5m2fnuz() = default;
+
+  constexpr C10_HOST_DEVICE Float8_e5m2fnuz(uint8_t bits, from_bits_t)
+      : x(bits) {}
+  inline C10_HOST_DEVICE Float8_e5m2fnuz(float value);
+  inline C10_HOST_DEVICE operator float() const;
+  inline C10_HOST_DEVICE bool isnan() const;
+  inline C10_HOST_DEVICE bool isinf() const;
+};
+
+C10_API inline std::ostream& operator<<(
+    std::ostream& out,
+    const Float8_e5m2fnuz& value) {
+  out << (float)value;
+  return out;
+}
+
+} // namespace c10
+
+#include <c10/util/Float8_e5m2fnuz-inl.h> // IWYU pragma: keep

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Gauge.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <memory>
+#include <string_view>
+
+#include <c10/macros/Macros.h>
+#include <c10/util/SmallVector.h>
+
+namespace c10::monitor {
+namespace detail {
+
+class GaugeImpl;
+
+class GaugeBackendIf {
+ public:
+  virtual ~GaugeBackendIf() = default;
+  virtual void record(int64_t value) noexcept = 0;
+};
+
+class GaugeBackendFactoryIf {
+ public:
+  virtual ~GaugeBackendFactoryIf() = default;
+
+  // May return nullptr if the gauge will be ignored by the given backend.
+  virtual std::unique_ptr<GaugeBackendIf> create(
+      std::string_view key) noexcept = 0;
+};
+
+void C10_API registerGaugeBackend(std::unique_ptr<GaugeBackendFactoryIf>);
+} // namespace detail
+
+// A handle to a Gauge.
+class C10_API GaugeHandle {
+ public:
+  explicit GaugeHandle(std::string_view key);
+  void record(int64_t value);
+
+ private:
+  detail::GaugeImpl& impl_;
+};
+
+} // namespace c10::monitor
+
+#define STATIC_GAUGE(_key)                            \
+  []() -> ::c10::monitor::GaugeHandle& {              \
+    static ::c10::monitor::GaugeHandle handle(#_key); \
+    return handle;                                    \
+  }()

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Half.h

@@ -0,0 +1,535 @@
+#pragma once
+
+/// Defines the Half type (half-precision floating-point) including conversions
+/// to standard C types and basic arithmetic operations. Note that arithmetic
+/// operations are implemented by converting to floating point and
+/// performing the operation in float32, instead of using CUDA half intrinsics.
+/// Most uses of this type within ATen are memory bound, including the
+/// element-wise kernels, and the half intrinsics aren't efficient on all GPUs.
+/// If you are writing a compute bound kernel, you can use the CUDA half
+/// intrinsics directly on the Half type from device code.
+
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/TypeSafeSignMath.h>
+#include <c10/util/bit_cast.h>
+#include <c10/util/complex.h>
+#include <c10/util/floating_point_utils.h>
+#include <type_traits>
+
+#if defined(__cplusplus)
+#include <cmath>
+#elif !defined(__OPENCL_VERSION__)
+#include <math.h>
+#endif
+
+#ifdef _MSC_VER
+#include <intrin.h>
+#endif
+
+#include <cstdint>
+#include <cstring>
+#include <iosfwd>
+#include <limits>
+#include <ostream>
+
+#ifdef __CUDACC__
+#include <cuda_fp16.h>
+#endif
+
+#ifdef __HIPCC__
+#include <hip/hip_fp16.h>
+#endif
+
+#if defined(CL_SYCL_LANGUAGE_VERSION)
+#include <CL/sycl.hpp> // for SYCL 1.2.1
+#elif defined(SYCL_LANGUAGE_VERSION)
+#include <sycl/sycl.hpp> // for SYCL 2020
+#endif
+
+#if defined(__aarch64__) && !defined(__CUDACC__)
+#include <arm_neon.h>
+#endif
+
+namespace c10 {
+
+namespace detail {
+
+/*
+ * Convert a 16-bit floating-point number in IEEE half-precision format, in bit
+ * representation, to a 32-bit floating-point number in IEEE single-precision
+ * format, in bit representation.
+ *
+ * @note The implementation doesn't use any floating-point operations.
+ */
+inline uint32_t fp16_ieee_to_fp32_bits(uint16_t h) {
+  /*
+   * Extend the half-precision floating-point number to 32 bits and shift to the
+   * upper part of the 32-bit word:
+   *      +---+-----+------------+-------------------+
+   *      | S |EEEEE|MM MMMM MMMM|0000 0000 0000 0000|
+   *      +---+-----+------------+-------------------+
+   * Bits  31  26-30    16-25            0-15
+   *
+   * S - sign bit, E - bits of the biased exponent, M - bits of the mantissa, 0
+   * - zero bits.
+   */
+  const uint32_t w = (uint32_t)h << 16;
+  /*
+   * Extract the sign of the input number into the high bit of the 32-bit word:
+   *
+   *      +---+----------------------------------+
+   *      | S |0000000 00000000 00000000 00000000|
+   *      +---+----------------------------------+
+   * Bits  31                 0-31
+   */
+  const uint32_t sign = w & UINT32_C(0x80000000);
+  /*
+   * Extract mantissa and biased exponent of the input number into the bits 0-30
+   * of the 32-bit word:
+   *
+   *      +---+-----+------------+-------------------+
+   *      | 0 |EEEEE|MM MMMM MMMM|0000 0000 0000 0000|
+   *      +---+-----+------------+-------------------+
+   * Bits  30  27-31     17-26            0-16
+   */
+  const uint32_t nonsign = w & UINT32_C(0x7FFFFFFF);
+  /*
+   * Renorm shift is the number of bits to shift mantissa left to make the
+   * half-precision number normalized. If the initial number is normalized, some
+   * of its high 6 bits (sign == 0 and 5-bit exponent) equals one. In this case
+   * renorm_shift == 0. If the number is denormalize, renorm_shift > 0. Note
+   * that if we shift denormalized nonsign by renorm_shift, the unit bit of
+   * mantissa will shift into exponent, turning the biased exponent into 1, and
+   * making mantissa normalized (i.e. without leading 1).
+   */
+#ifdef _MSC_VER
+  unsigned long nonsign_bsr;
+  _BitScanReverse(&nonsign_bsr, (unsigned long)nonsign);
+  uint32_t renorm_shift = (uint32_t)nonsign_bsr ^ 31;
+#else
+  uint32_t renorm_shift = __builtin_clz(nonsign);
+#endif
+  renorm_shift = renorm_shift > 5 ? renorm_shift - 5 : 0;
+  /*
+   * Iff half-precision number has exponent of 15, the addition overflows
+   * it into bit 31, and the subsequent shift turns the high 9 bits
+   * into 1. Thus inf_nan_mask == 0x7F800000 if the half-precision number
+   * had exponent of 15 (i.e. was NaN or infinity) 0x00000000 otherwise
+   */
+  const int32_t inf_nan_mask =
+      ((int32_t)(nonsign + 0x04000000) >> 8) & INT32_C(0x7F800000);
+  /*
+   * Iff nonsign is 0, it overflows into 0xFFFFFFFF, turning bit 31
+   * into 1. Otherwise, bit 31 remains 0. The signed shift right by 31
+   * broadcasts bit 31 into all bits of the zero_mask. Thus zero_mask ==
+   * 0xFFFFFFFF if the half-precision number was zero (+0.0h or -0.0h)
+   * 0x00000000 otherwise
+   */
+  const int32_t zero_mask = (int32_t)(nonsign - 1) >> 31;
+  /*
+   * 1. Shift nonsign left by renorm_shift to normalize it (if the input
+   * was denormal)
+   * 2. Shift nonsign right by 3 so the exponent (5 bits originally)
+   * becomes an 8-bit field and 10-bit mantissa shifts into the 10 high
+   * bits of the 23-bit mantissa of IEEE single-precision number.
+   * 3. Add 0x70 to the exponent (starting at bit 23) to compensate the
+   * different in exponent bias (0x7F for single-precision number less 0xF
+   * for half-precision number).
+   * 4. Subtract renorm_shift from the exponent (starting at bit 23) to
+   * account for renormalization. As renorm_shift is less than 0x70, this
+   * can be combined with step 3.
+   * 5. Binary OR with inf_nan_mask to turn the exponent into 0xFF if the
+   * input was NaN or infinity.
+   * 6. Binary ANDNOT with zero_mask to turn the mantissa and exponent
+   * into zero if the input was zero.
+   * 7. Combine with the sign of the input number.
+   */
+  return sign |
+      ((((nonsign << renorm_shift >> 3) + ((0x70 - renorm_shift) << 23)) |
+        inf_nan_mask) &
+       ~zero_mask);
+}
+
+/*
+ * Convert a 16-bit floating-point number in IEEE half-precision format, in bit
+ * representation, to a 32-bit floating-point number in IEEE single-precision
+ * format.
+ *
+ * @note The implementation relies on IEEE-like (no assumption about rounding
+ * mode and no operations on denormals) floating-point operations and bitcasts
+ * between integer and floating-point variables.
+ */
+C10_HOST_DEVICE inline float fp16_ieee_to_fp32_value(uint16_t h) {
+  /*
+   * Extend the half-precision floating-point number to 32 bits and shift to the
+   * upper part of the 32-bit word:
+   *      +---+-----+------------+-------------------+
+   *      | S |EEEEE|MM MMMM MMMM|0000 0000 0000 0000|
+   *      +---+-----+------------+-------------------+
+   * Bits  31  26-30    16-25            0-15
+   *
+   * S - sign bit, E - bits of the biased exponent, M - bits of the mantissa, 0
+   * - zero bits.
+   */
+  const uint32_t w = (uint32_t)h << 16;
+  /*
+   * Extract the sign of the input number into the high bit of the 32-bit word:
+   *
+   *      +---+----------------------------------+
+   *      | S |0000000 00000000 00000000 00000000|
+   *      +---+----------------------------------+
+   * Bits  31                 0-31
+   */
+  const uint32_t sign = w & UINT32_C(0x80000000);
+  /*
+   * Extract mantissa and biased exponent of the input number into the high bits
+   * of the 32-bit word:
+   *
+   *      +-----+------------+---------------------+
+   *      |EEEEE|MM MMMM MMMM|0 0000 0000 0000 0000|
+   *      +-----+------------+---------------------+
+   * Bits  27-31    17-26            0-16
+   */
+  const uint32_t two_w = w + w;
+
+  /*
+   * Shift mantissa and exponent into bits 23-28 and bits 13-22 so they become
+   * mantissa and exponent of a single-precision floating-point number:
+   *
+   *       S|Exponent |          Mantissa
+   *      +-+---+-----+------------+----------------+
+   *      |0|000|EEEEE|MM MMMM MMMM|0 0000 0000 0000|
+   *      +-+---+-----+------------+----------------+
+   * Bits   | 23-31   |           0-22
+   *
+   * Next, there are some adjustments to the exponent:
+   * - The exponent needs to be corrected by the difference in exponent bias
+   * between single-precision and half-precision formats (0x7F - 0xF = 0x70)
+   * - Inf and NaN values in the inputs should become Inf and NaN values after
+   * conversion to the single-precision number. Therefore, if the biased
+   * exponent of the half-precision input was 0x1F (max possible value), the
+   * biased exponent of the single-precision output must be 0xFF (max possible
+   * value). We do this correction in two steps:
+   *   - First, we adjust the exponent by (0xFF - 0x1F) = 0xE0 (see exp_offset
+   * below) rather than by 0x70 suggested by the difference in the exponent bias
+   * (see above).
+   *   - Then we multiply the single-precision result of exponent adjustment by
+   * 2**(-112) to reverse the effect of exponent adjustment by 0xE0 less the
+   * necessary exponent adjustment by 0x70 due to difference in exponent bias.
+   *     The floating-point multiplication hardware would ensure than Inf and
+   * NaN would retain their value on at least partially IEEE754-compliant
+   * implementations.
+   *
+   * Note that the above operations do not handle denormal inputs (where biased
+   * exponent == 0). However, they also do not operate on denormal inputs, and
+   * do not produce denormal results.
+   */
+  constexpr uint32_t exp_offset = UINT32_C(0xE0) << 23;
+  // const float exp_scale = 0x1.0p-112f;
+  constexpr uint32_t scale_bits = (uint32_t)15 << 23;
+  float exp_scale_val = 0;
+  std::memcpy(&exp_scale_val, &scale_bits, sizeof(exp_scale_val));
+  const float exp_scale = exp_scale_val;
+  const float normalized_value =
+      fp32_from_bits((two_w >> 4) + exp_offset) * exp_scale;
+
+  /*
+   * Convert denormalized half-precision inputs into single-precision results
+   * (always normalized). Zero inputs are also handled here.
+   *
+   * In a denormalized number the biased exponent is zero, and mantissa has
+   * on-zero bits. First, we shift mantissa into bits 0-9 of the 32-bit word.
+   *
+   *                  zeros           |  mantissa
+   *      +---------------------------+------------+
+   *      |0000 0000 0000 0000 0000 00|MM MMMM MMMM|
+   *      +---------------------------+------------+
+   * Bits             10-31                0-9
+   *
+   * Now, remember that denormalized half-precision numbers are represented as:
+   *    FP16 = mantissa * 2**(-24).
+   * The trick is to construct a normalized single-precision number with the
+   * same mantissa and thehalf-precision input and with an exponent which would
+   * scale the corresponding mantissa bits to 2**(-24). A normalized
+   * single-precision floating-point number is represented as: FP32 = (1 +
+   * mantissa * 2**(-23)) * 2**(exponent - 127) Therefore, when the biased
+   * exponent is 126, a unit change in the mantissa of the input denormalized
+   * half-precision number causes a change of the constructed single-precision
+   * number by 2**(-24), i.e. the same amount.
+   *
+   * The last step is to adjust the bias of the constructed single-precision
+   * number. When the input half-precision number is zero, the constructed
+   * single-precision number has the value of FP32 = 1 * 2**(126 - 127) =
+   * 2**(-1) = 0.5 Therefore, we need to subtract 0.5 from the constructed
+   * single-precision number to get the numerical equivalent of the input
+   * half-precision number.
+   */
+  constexpr uint32_t magic_mask = UINT32_C(126) << 23;
+  constexpr float magic_bias = 0.5f;
+  const float denormalized_value =
+      fp32_from_bits((two_w >> 17) | magic_mask) - magic_bias;
+
+  /*
+   * - Choose either results of conversion of input as a normalized number, or
+   * as a denormalized number, depending on the input exponent. The variable
+   * two_w contains input exponent in bits 27-31, therefore if its smaller than
+   * 2**27, the input is either a denormal number, or zero.
+   * - Combine the result of conversion of exponent and mantissa with the sign
+   * of the input number.
+   */
+  constexpr uint32_t denormalized_cutoff = UINT32_C(1) << 27;
+  const uint32_t result = sign |
+      (two_w < denormalized_cutoff ? fp32_to_bits(denormalized_value)
+                                   : fp32_to_bits(normalized_value));
+  return fp32_from_bits(result);
+}
+
+/*
+ * Convert a 32-bit floating-point number in IEEE single-precision format to a
+ * 16-bit floating-point number in IEEE half-precision format, in bit
+ * representation.
+ *
+ * @note The implementation relies on IEEE-like (no assumption about rounding
+ * mode and no operations on denormals) floating-point operations and bitcasts
+ * between integer and floating-point variables.
+ */
+inline uint16_t fp16_ieee_from_fp32_value(float f) {
+  // const float scale_to_inf = 0x1.0p+112f;
+  // const float scale_to_zero = 0x1.0p-110f;
+  constexpr uint32_t scale_to_inf_bits = (uint32_t)239 << 23;
+  constexpr uint32_t scale_to_zero_bits = (uint32_t)17 << 23;
+  float scale_to_inf_val = 0, scale_to_zero_val = 0;
+  std::memcpy(&scale_to_inf_val, &scale_to_inf_bits, sizeof(scale_to_inf_val));
+  std::memcpy(
+      &scale_to_zero_val, &scale_to_zero_bits, sizeof(scale_to_zero_val));
+  const float scale_to_inf = scale_to_inf_val;
+  const float scale_to_zero = scale_to_zero_val;
+
+#if defined(_MSC_VER) && _MSC_VER == 1916
+  float base = ((signbit(f) != 0 ? -f : f) * scale_to_inf) * scale_to_zero;
+#else
+  float base = (fabsf(f) * scale_to_inf) * scale_to_zero;
+#endif
+
+  const uint32_t w = fp32_to_bits(f);
+  const uint32_t shl1_w = w + w;
+  const uint32_t sign = w & UINT32_C(0x80000000);
+  uint32_t bias = shl1_w & UINT32_C(0xFF000000);
+  if (bias < UINT32_C(0x71000000)) {
+    bias = UINT32_C(0x71000000);
+  }
+
+  base = fp32_from_bits((bias >> 1) + UINT32_C(0x07800000)) + base;
+  const uint32_t bits = fp32_to_bits(base);
+  const uint32_t exp_bits = (bits >> 13) & UINT32_C(0x00007C00);
+  const uint32_t mantissa_bits = bits & UINT32_C(0x00000FFF);
+  const uint32_t nonsign = exp_bits + mantissa_bits;
+  return static_cast<uint16_t>(
+      (sign >> 16) |
+      (shl1_w > UINT32_C(0xFF000000) ? UINT16_C(0x7E00) : nonsign));
+}
+
+#if defined(__aarch64__) && !defined(__CUDACC__)
+inline float16_t fp16_from_bits(uint16_t h) {
+  return c10::bit_cast<float16_t>(h);
+}
+
+inline uint16_t fp16_to_bits(float16_t f) {
+  return c10::bit_cast<uint16_t>(f);
+}
+
+// According to https://godbolt.org/z/frExdbsWG it would translate to single
+// fcvt s0, h0
+inline float native_fp16_to_fp32_value(uint16_t h) {
+  return static_cast<float>(fp16_from_bits(h));
+}
+
+inline uint16_t native_fp16_from_fp32_value(float f) {
+  return fp16_to_bits(static_cast<float16_t>(f));
+}
+#endif
+
+} // namespace detail
+
+struct alignas(2) Half {
+  unsigned short x;
+
+  struct from_bits_t {};
+  C10_HOST_DEVICE static constexpr from_bits_t from_bits() {
+    return from_bits_t();
+  }
+
+  // HIP wants __host__ __device__ tag, CUDA does not
+#if defined(USE_ROCM)
+  C10_HOST_DEVICE Half() = default;
+#else
+  Half() = default;
+#endif
+
+  constexpr C10_HOST_DEVICE Half(unsigned short bits, from_bits_t) : x(bits) {}
+#if defined(__aarch64__) && !defined(__CUDACC__)
+  inline Half(float16_t value);
+  inline operator float16_t() const;
+#else
+  inline C10_HOST_DEVICE Half(float value);
+  inline C10_HOST_DEVICE operator float() const;
+#endif
+
+#if defined(__CUDACC__) || defined(__HIPCC__)
+  inline C10_HOST_DEVICE Half(const __half& value);
+  inline C10_HOST_DEVICE operator __half() const;
+#endif
+#ifdef SYCL_LANGUAGE_VERSION
+  inline C10_HOST_DEVICE Half(const sycl::half& value);
+  inline C10_HOST_DEVICE operator sycl::half() const;
+#endif
+};
+
+// TODO : move to complex.h
+template <>
+struct alignas(4) complex<Half> {
+  Half real_;
+  Half imag_;
+
+  // Constructors
+  complex() = default;
+  // Half constructor is not constexpr so the following constructor can't
+  // be constexpr
+  C10_HOST_DEVICE explicit inline complex(const Half& real, const Half& imag)
+      : real_(real), imag_(imag) {}
+  C10_HOST_DEVICE inline complex(const c10::complex<float>& value)
+      : real_(value.real()), imag_(value.imag()) {}
+
+  // Conversion operator
+  inline C10_HOST_DEVICE operator c10::complex<float>() const {
+    return {real_, imag_};
+  }
+
+  constexpr C10_HOST_DEVICE Half real() const {
+    return real_;
+  }
+  constexpr C10_HOST_DEVICE Half imag() const {
+    return imag_;
+  }
+
+  C10_HOST_DEVICE complex<Half>& operator+=(const complex<Half>& other) {
+    real_ = static_cast<float>(real_) + static_cast<float>(other.real_);
+    imag_ = static_cast<float>(imag_) + static_cast<float>(other.imag_);
+    return *this;
+  }
+
+  C10_HOST_DEVICE complex<Half>& operator-=(const complex<Half>& other) {
+    real_ = static_cast<float>(real_) - static_cast<float>(other.real_);
+    imag_ = static_cast<float>(imag_) - static_cast<float>(other.imag_);
+    return *this;
+  }
+
+  C10_HOST_DEVICE complex<Half>& operator*=(const complex<Half>& other) {
+    auto a = static_cast<float>(real_);
+    auto b = static_cast<float>(imag_);
+    auto c = static_cast<float>(other.real());
+    auto d = static_cast<float>(other.imag());
+    real_ = a * c - b * d;
+    imag_ = a * d + b * c;
+    return *this;
+  }
+};
+
+// In some versions of MSVC, there will be a compiler error when building.
+// C4146: unary minus operator applied to unsigned type, result still unsigned
+// C4804: unsafe use of type 'bool' in operation
+// It can be addressed by disabling the following warning.
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4146)
+#pragma warning(disable : 4804)
+#pragma warning(disable : 4018)
+#endif
+
+// The overflow checks may involve float to int conversion which may
+// trigger precision loss warning. Re-enable the warning once the code
+// is fixed. See T58053069.
+C10_CLANG_DIAGNOSTIC_PUSH()
+#if C10_CLANG_HAS_WARNING("-Wimplicit-float-conversion")
+C10_CLANG_DIAGNOSTIC_IGNORE("-Wimplicit-float-conversion")
+#endif
+
+// bool can be converted to any type.
+// Without specializing on bool, in pytorch_linux_trusty_py2_7_9_build:
+// `error: comparison of constant '255' with boolean expression is always false`
+// for `f > limit::max()` below
+template <typename To, typename From>
+std::enable_if_t<std::is_same_v<From, bool>, bool> overflows(
+    From /*f*/,
+    bool strict_unsigned [[maybe_unused]] = false) {
+  return false;
+}
+
+// skip isnan and isinf check for integral types
+template <typename To, typename From>
+std::enable_if_t<std::is_integral_v<From> && !std::is_same_v<From, bool>, bool>
+overflows(From f, bool strict_unsigned = false) {
+  using limit = std::numeric_limits<typename scalar_value_type<To>::type>;
+  if constexpr (!limit::is_signed && std::numeric_limits<From>::is_signed) {
+    // allow for negative numbers to wrap using two's complement arithmetic.
+    // For example, with uint8, this allows for `a - b` to be treated as
+    // `a + 255 * b`.
+    if (!strict_unsigned) {
+      return greater_than_max<To>(f) ||
+          (c10::is_negative(f) &&
+           -static_cast<uint64_t>(f) > static_cast<uint64_t>(limit::max()));
+    }
+  }
+  return c10::less_than_lowest<To>(f) || greater_than_max<To>(f);
+}
+
+template <typename To, typename From>
+std::enable_if_t<std::is_floating_point_v<From>, bool> overflows(
+    From f,
+    bool strict_unsigned [[maybe_unused]] = false) {
+  using limit = std::numeric_limits<typename scalar_value_type<To>::type>;
+  if (limit::has_infinity && std::isinf(static_cast<double>(f))) {
+    return false;
+  }
+  if (!limit::has_quiet_NaN && (f != f)) {
+    return true;
+  }
+  return f < limit::lowest() || f > limit::max();
+}
+
+C10_CLANG_DIAGNOSTIC_POP()
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+template <typename To, typename From>
+std::enable_if_t<is_complex<From>::value, bool> overflows(
+    From f,
+    bool strict_unsigned = false) {
+  // casts from complex to real are considered to overflow if the
+  // imaginary component is non-zero
+  if (!is_complex<To>::value && f.imag() != 0) {
+    return true;
+  }
+  // Check for overflow componentwise
+  // (Technically, the imag overflow check is guaranteed to be false
+  // when !is_complex<To>, but any optimizer worth its salt will be
+  // able to figure it out.)
+  return overflows<
+             typename scalar_value_type<To>::type,
+             typename From::value_type>(f.real(), strict_unsigned) ||
+      overflows<
+             typename scalar_value_type<To>::type,
+             typename From::value_type>(f.imag(), strict_unsigned);
+}
+
+C10_API inline std::ostream& operator<<(std::ostream& out, const Half& value) {
+  out << (float)value;
+  return out;
+}
+
+} // namespace c10
+
+#include <c10/util/Half-inl.h> // IWYU pragma: keep

videochat2/lib/python3.10/site-packages/torch/include/c10/util/IdWrapper.h

@@ -0,0 +1,77 @@
+#pragma once
+
+#include <cstddef>
+#include <functional>
+#include <utility>
+
+namespace c10 {
+
+/**
+ * This template simplifies generation of simple classes that wrap an id
+ * in a typesafe way. Namely, you can use it to create a very lightweight
+ * type that only offers equality comparators and hashing. Example:
+ *
+ *   struct MyIdType final : IdWrapper<MyIdType, uint32_t> {
+ *     constexpr explicit MyIdType(uint32_t id): IdWrapper(id) {}
+ *   };
+ *
+ * Then in the global top level namespace:
+ *
+ *   C10_DEFINE_HASH_FOR_IDWRAPPER(MyIdType);
+ *
+ * That's it - equality operators and hash functions are automatically defined
+ * for you, given the underlying type supports it.
+ */
+template <class ConcreteType, class UnderlyingType>
+class IdWrapper {
+ public:
+  using underlying_type = UnderlyingType;
+  using concrete_type = ConcreteType;
+
+ protected:
+  constexpr explicit IdWrapper(underlying_type id) noexcept(
+      noexcept(underlying_type(std::declval<underlying_type>())))
+      : id_(id) {}
+
+  constexpr underlying_type underlyingId() const
+      noexcept(noexcept(underlying_type(std::declval<underlying_type>()))) {
+    return id_;
+  }
+
+ private:
+  friend size_t hash_value(const concrete_type& v) {
+    return std::hash<underlying_type>()(v.id_);
+  }
+
+  // TODO Making operator== noexcept if underlying type is noexcept equality
+  // comparable doesn't work with GCC 4.8.
+  //      Fix this once we don't need GCC 4.8 anymore.
+  friend constexpr bool operator==(
+      const concrete_type& lhs,
+      const concrete_type& rhs) noexcept {
+    return lhs.id_ == rhs.id_;
+  }
+
+  // TODO Making operator!= noexcept if operator== is noexcept doesn't work with
+  // GCC 4.8.
+  //      Fix this once we don't need GCC 4.8 anymore.
+  friend constexpr bool operator!=(
+      const concrete_type& lhs,
+      const concrete_type& rhs) noexcept {
+    return !(lhs == rhs);
+  }
+
+  underlying_type id_;
+};
+
+} // namespace c10
+
+#define C10_DEFINE_HASH_FOR_IDWRAPPER(ClassName) \
+  namespace std {                                \
+  template <>                                    \
+  struct hash<ClassName> {                       \
+    size_t operator()(ClassName x) const {       \
+      return hash_value(x);                      \
+    }                                            \
+  };                                             \
+  }

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Lazy.h

@@ -0,0 +1,120 @@
+#pragma once
+
+#include <atomic>
+#include <utility>
+
+namespace c10 {
+
+/**
+ * Thread-safe lazy value with opportunistic concurrency: on concurrent first
+ * access, the factory may be called by multiple threads, but only one result is
+ * stored and its reference returned to all the callers.
+ *
+ * Value is heap-allocated; this optimizes for the case in which the value is
+ * never actually computed.
+ */
+template <class T>
+class OptimisticLazy {
+ public:
+  OptimisticLazy() = default;
+  OptimisticLazy(const OptimisticLazy& other) {
+    if (T* value = other.value_.load(std::memory_order_acquire)) {
+      value_ = new T(*value);
+    }
+  }
+  OptimisticLazy(OptimisticLazy&& other) noexcept
+      : value_(other.value_.exchange(nullptr, std::memory_order_acq_rel)) {}
+  ~OptimisticLazy() {
+    reset();
+  }
+
+  template <class Factory>
+  T& ensure(Factory&& factory) {
+    if (T* value = value_.load(std::memory_order_acquire)) {
+      return *value;
+    }
+    T* value = new T(factory());
+    T* old = nullptr;
+    if (!value_.compare_exchange_strong(
+            old, value, std::memory_order_release, std::memory_order_acquire)) {
+      delete value;
+      value = old;
+    }
+    return *value;
+  }
+
+  // The following methods are not thread-safe: they should not be called
+  // concurrently with any other method.
+
+  OptimisticLazy& operator=(const OptimisticLazy& other) {
+    *this = OptimisticLazy{other};
+    return *this;
+  }
+
+  OptimisticLazy& operator=(OptimisticLazy&& other) noexcept {
+    if (this != &other) {
+      reset();
+      value_.store(
+          other.value_.exchange(nullptr, std::memory_order_acquire),
+          std::memory_order_release);
+    }
+    return *this;
+  }
+
+  void reset() {
+    if (T* old = value_.load(std::memory_order_relaxed)) {
+      value_.store(nullptr, std::memory_order_relaxed);
+      delete old;
+    }
+  }
+
+ private:
+  std::atomic<T*> value_{nullptr};
+};
+
+/**
+ * Interface for a value that is computed on first access.
+ */
+template <class T>
+class LazyValue {
+ public:
+  virtual ~LazyValue() = default;
+
+  virtual const T& get() const = 0;
+};
+
+/**
+ * Convenience thread-safe LazyValue implementation with opportunistic
+ * concurrency.
+ */
+template <class T>
+class OptimisticLazyValue : public LazyValue<T> {
+ public:
+  const T& get() const override {
+    return value_.ensure([this] { return compute(); });
+  }
+
+ private:
+  virtual T compute() const = 0;
+
+  mutable OptimisticLazy<T> value_;
+};
+
+/**
+ * Convenience immutable (thus thread-safe) LazyValue implementation for cases
+ * in which the value is not actually lazy.
+ */
+template <class T>
+class PrecomputedLazyValue : public LazyValue<T> {
+ public:
+  PrecomputedLazyValue(T value) : value_(std::move(value)) {}
+
+  const T& get() const override {
+    return value_;
+  }
+
+ private:
+  T value_;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/LeftRight.h

@@ -0,0 +1,223 @@
+#include <c10/macros/Macros.h>
+#include <c10/util/Synchronized.h>
+#include <array>
+#include <atomic>
+#include <mutex>
+#include <thread>
+
+namespace c10 {
+
+namespace detail {
+
+struct IncrementRAII final {
+ public:
+  explicit IncrementRAII(std::atomic<int32_t>* counter) : _counter(counter) {
+    _counter->fetch_add(1);
+  }
+
+  ~IncrementRAII() {
+    _counter->fetch_sub(1);
+  }
+
+ private:
+  std::atomic<int32_t>* _counter;
+
+  C10_DISABLE_COPY_AND_ASSIGN(IncrementRAII);
+};
+
+} // namespace detail
+
+// LeftRight wait-free readers synchronization primitive
+// https://hal.archives-ouvertes.fr/hal-01207881/document
+//
+// LeftRight is quite easy to use (it can make an arbitrary
+// data structure permit wait-free reads), but it has some
+// particular performance characteristics you should be aware
+// of if you're deciding to use it:
+//
+//  - Reads still incur an atomic write (this is how LeftRight
+//    keeps track of how long it needs to keep around the old
+//    data structure)
+//
+//  - Writes get executed twice, to keep both the left and right
+//    versions up to date.  So if your write is expensive or
+//    nondeterministic, this is also an inappropriate structure
+//
+// LeftRight is used fairly rarely in PyTorch's codebase.  If you
+// are still not sure if you need it or not, consult your local
+// C++ expert.
+//
+template <class T>
+class LeftRight final {
+ public:
+  template <class... Args>
+  explicit LeftRight(const Args&... args)
+      : _counters{{{0}, {0}}},
+        _foregroundCounterIndex(0),
+        _foregroundDataIndex(0),
+        _data{{T{args...}, T{args...}}},
+        _writeMutex() {}
+
+  // Copying and moving would not be threadsafe.
+  // Needs more thought and careful design to make that work.
+  LeftRight(const LeftRight&) = delete;
+  LeftRight(LeftRight&&) noexcept = delete;
+  LeftRight& operator=(const LeftRight&) = delete;
+  LeftRight& operator=(LeftRight&&) noexcept = delete;
+
+  ~LeftRight() {
+    // wait until any potentially running writers are finished
+    { std::unique_lock<std::mutex> lock(_writeMutex); }
+
+    // wait until any potentially running readers are finished
+    while (_counters[0].load() != 0 || _counters[1].load() != 0) {
+      std::this_thread::yield();
+    }
+  }
+
+  template <typename F>
+  auto read(F&& readFunc) const {
+    detail::IncrementRAII _increment_counter(
+        &_counters[_foregroundCounterIndex.load()]);
+
+    return std::forward<F>(readFunc)(_data[_foregroundDataIndex.load()]);
+  }
+
+  // Throwing an exception in writeFunc is ok but causes the state to be either
+  // the old or the new state, depending on if the first or the second call to
+  // writeFunc threw.
+  template <typename F>
+  auto write(F&& writeFunc) {
+    std::unique_lock<std::mutex> lock(_writeMutex);
+
+    return _write(std::forward<F>(writeFunc));
+  }
+
+ private:
+  template <class F>
+  auto _write(const F& writeFunc) {
+    /*
+     * Assume, A is in background and B in foreground. In simplified terms, we
+     * want to do the following:
+     * 1. Write to A (old background)
+     * 2. Switch A/B
+     * 3. Write to B (new background)
+     *
+     * More detailed algorithm (explanations on why this is important are below
+     * in code):
+     * 1. Write to A
+     * 2. Switch A/B data pointers
+     * 3. Wait until A counter is zero
+     * 4. Switch A/B counters
+     * 5. Wait until B counter is zero
+     * 6. Write to B
+     */
+
+    auto localDataIndex = _foregroundDataIndex.load();
+
+    // 1. Write to A
+    _callWriteFuncOnBackgroundInstance(writeFunc, localDataIndex);
+
+    // 2. Switch A/B data pointers
+    localDataIndex = localDataIndex ^ 1;
+    _foregroundDataIndex = localDataIndex;
+
+    /*
+     * 3. Wait until A counter is zero
+     *
+     * In the previous write run, A was foreground and B was background.
+     * There was a time after switching _foregroundDataIndex (B to foreground)
+     * and before switching _foregroundCounterIndex, in which new readers could
+     * have read B but incremented A's counter.
+     *
+     * In this current run, we just switched _foregroundDataIndex (A back to
+     * foreground), but before writing to the new background B, we have to make
+     * sure A's counter was zero briefly, so all these old readers are gone.
+     */
+    auto localCounterIndex = _foregroundCounterIndex.load();
+    _waitForBackgroundCounterToBeZero(localCounterIndex);
+
+    /*
+     * 4. Switch A/B counters
+     *
+     * Now that we know all readers on B are really gone, we can switch the
+     * counters and have new readers increment A's counter again, which is the
+     * correct counter since they're reading A.
+     */
+    localCounterIndex = localCounterIndex ^ 1;
+    _foregroundCounterIndex = localCounterIndex;
+
+    /*
+     * 5. Wait until B counter is zero
+     *
+     * This waits for all the readers on B that came in while both data and
+     * counter for B was in foreground, i.e. normal readers that happened
+     * outside of that brief gap between switching data and counter.
+     */
+    _waitForBackgroundCounterToBeZero(localCounterIndex);
+
+    // 6. Write to B
+    return _callWriteFuncOnBackgroundInstance(writeFunc, localDataIndex);
+  }
+
+  template <class F>
+  auto _callWriteFuncOnBackgroundInstance(
+      const F& writeFunc,
+      uint8_t localDataIndex) {
+    try {
+      return writeFunc(_data[localDataIndex ^ 1]);
+    } catch (...) {
+      // recover invariant by copying from the foreground instance
+      _data[localDataIndex ^ 1] = _data[localDataIndex];
+      // rethrow
+      throw;
+    }
+  }
+
+  void _waitForBackgroundCounterToBeZero(uint8_t counterIndex) {
+    while (_counters[counterIndex ^ 1].load() != 0) {
+      std::this_thread::yield();
+    }
+  }
+
+  mutable std::array<std::atomic<int32_t>, 2> _counters;
+  std::atomic<uint8_t> _foregroundCounterIndex;
+  std::atomic<uint8_t> _foregroundDataIndex;
+  std::array<T, 2> _data;
+  std::mutex _writeMutex;
+};
+
+// RWSafeLeftRightWrapper is API compatible with LeftRight and uses a
+// read-write lock to protect T (data).
+template <class T>
+class RWSafeLeftRightWrapper final {
+ public:
+  template <class... Args>
+  explicit RWSafeLeftRightWrapper(const Args&... args) : data_{args...} {}
+
+  // RWSafeLeftRightWrapper is not copyable or moveable since LeftRight
+  // is not copyable or moveable.
+  RWSafeLeftRightWrapper(const RWSafeLeftRightWrapper&) = delete;
+  RWSafeLeftRightWrapper(RWSafeLeftRightWrapper&&) noexcept = delete;
+  RWSafeLeftRightWrapper& operator=(const RWSafeLeftRightWrapper&) = delete;
+  RWSafeLeftRightWrapper& operator=(RWSafeLeftRightWrapper&&) noexcept = delete;
+
+  template <typename F>
+  // NOLINTNEXTLINE(cppcoreguidelines-missing-std-forward)
+  auto read(F&& readFunc) const {
+    return data_.withLock(
+        [&readFunc](T const& data) { return std::forward<F>(readFunc)(data); });
+  }
+
+  template <typename F>
+  // NOLINTNEXTLINE(cppcoreguidelines-missing-std-forward)
+  auto write(F&& writeFunc) {
+    return data_.withLock(
+        [&writeFunc](T& data) { return std::forward<F>(writeFunc)(data); });
+  }
+
+ private:
+  c10::Synchronized<T> data_;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Logging.h

@@ -0,0 +1,370 @@
+#ifndef C10_UTIL_LOGGING_H_
+#define C10_UTIL_LOGGING_H_
+
+#include <climits>
+#include <exception>
+#include <functional>
+#include <limits>
+#include <sstream>
+
+#include <c10/macros/Macros.h>
+#include <c10/util/Backtrace.h>
+#include <c10/util/Exception.h>
+#include <c10/util/Flags.h>
+#include <c10/util/StringUtil.h>
+
+// CAFFE2_LOG_THRESHOLD is a compile time flag that would allow us to turn off
+// logging at compile time so no logging message below that level is produced
+// at all. The value should be between INT_MIN and CAFFE_FATAL.
+#ifndef CAFFE2_LOG_THRESHOLD
+// If we have not defined the compile time log threshold, we keep all the
+// log cases.
+#define CAFFE2_LOG_THRESHOLD INT_MIN
+#endif // CAFFE2_LOG_THRESHOLD
+
+// Below are different implementations for glog and non-glog cases.
+#ifdef C10_USE_GLOG
+#include <c10/util/logging_is_google_glog.h>
+#else // !C10_USE_GLOG
+#include <c10/util/logging_is_not_google_glog.h>
+#endif // C10_USE_GLOG
+
+C10_DECLARE_int(caffe2_log_level);
+C10_DECLARE_bool(caffe2_use_fatal_for_enforce);
+
+// Some versions of GLOG support less-spammy version of LOG_EVERY_MS. If it's
+// not available - just short-circuit to the always working one one.
+// We define the C10_ name to avoid confusing other files
+#ifdef LOG_EVERY_MS
+#define C10_LOG_EVERY_MS(severity, ms) LOG_EVERY_MS(severity, ms)
+#else
+#define C10_LOG_EVERY_MS(severity, ms) LOG(severity)
+#endif
+
+// Same for LOG_FIRST_N
+#ifdef LOG_FIRST_N
+#define C10_LOG_FIRST_N(severity, n) LOG_FIRST_N(severity, n)
+#else
+#define C10_LOG_FIRST_N(severity, n) LOG(severity)
+#endif
+
+// Same for LOG_EVERY_N
+#ifdef LOG_EVERY_N
+#define C10_LOG_EVERY_N(severity, n) LOG_EVERY_N(severity, n)
+#else
+#define C10_LOG_EVERY_N(severity, n) LOG(severity)
+#endif
+
+namespace c10 {
+
+using std::string;
+
+// Functions that we use for initialization.
+C10_API bool InitCaffeLogging(int* argc, char** argv);
+C10_API void UpdateLoggingLevelsFromFlags();
+
+[[noreturn]] C10_API void ThrowEnforceNotMet(
+    const char* file,
+    const int line,
+    const char* condition,
+    const std::string& msg,
+    const void* caller = nullptr);
+
+[[noreturn]] C10_API void ThrowEnforceNotMet(
+    const char* file,
+    const int line,
+    const char* condition,
+    const char* msg,
+    const void* caller = nullptr);
+
+[[noreturn]] C10_API inline void ThrowEnforceNotMet(
+    const char* file,
+    const int line,
+    const char* condition,
+    detail::CompileTimeEmptyString /*msg*/,
+    const void* caller = nullptr) {
+  ThrowEnforceNotMet(file, line, condition, "", caller);
+}
+
+[[noreturn]] C10_API void ThrowEnforceFiniteNotMet(
+    const char* file,
+    const int line,
+    const char* condition,
+    const std::string& msg,
+    const void* caller = nullptr);
+
+[[noreturn]] C10_API void ThrowEnforceFiniteNotMet(
+    const char* file,
+    const int line,
+    const char* condition,
+    const char* msg,
+    const void* caller = nullptr);
+
+[[noreturn]] C10_API inline void ThrowEnforceFiniteNotMet(
+    const char* file,
+    const int line,
+    const char* condition,
+    detail::CompileTimeEmptyString /*msg*/,
+    const void* caller = nullptr) {
+  ThrowEnforceFiniteNotMet(file, line, condition, "", caller);
+}
+
+constexpr bool IsUsingGoogleLogging() {
+#ifdef C10_USE_GLOG
+  return true;
+#else
+  return false;
+#endif
+}
+
+/**
+ * A utility to allow one to show log info to stderr after the program starts.
+ *
+ * This is similar to calling GLOG's --logtostderr, or setting caffe2_log_level
+ * to smaller than INFO. You are recommended to only use this in a few sparse
+ * cases, such as when you want to write a tutorial or something. Normally, use
+ * the commandline flags to set the log level.
+ */
+C10_API void ShowLogInfoToStderr();
+
+C10_API void SetStackTraceFetcher(std::function<::c10::Backtrace()> fetcher);
+
+/**
+ * Convenience function for non-lazy stack trace fetchers. The Backtrace
+ * overload should be preferred when stringifying the backtrace is expensive.
+ */
+C10_API void SetStackTraceFetcher(std::function<std::string()> fetcher);
+
+using EnforceNotMet = ::c10::Error;
+
+#define CAFFE_ENFORCE(condition, ...)                               \
+  do {                                                              \
+    if (C10_UNLIKELY(!(condition))) {                               \
+      ::c10::ThrowEnforceNotMet(                                    \
+          __FILE__, __LINE__, #condition, ::c10::str(__VA_ARGS__)); \
+    }                                                               \
+  } while (false)
+
+#define CAFFE_ENFORCE_FINITE(condition, ...)                        \
+  do {                                                              \
+    if (C10_UNLIKELY(!(condition))) {                               \
+      ::c10::ThrowEnforceFiniteNotMet(                              \
+          __FILE__, __LINE__, #condition, ::c10::str(__VA_ARGS__)); \
+    }                                                               \
+  } while (false)
+
+#define CAFFE_ENFORCE_WITH_CALLER(condition, ...)                         \
+  do {                                                                    \
+    if (C10_UNLIKELY(!(condition))) {                                     \
+      ::c10::ThrowEnforceNotMet(                                          \
+          __FILE__, __LINE__, #condition, ::c10::str(__VA_ARGS__), this); \
+    }                                                                     \
+  } while (false)
+
+#define CAFFE_THROW(...) \
+  ::c10::ThrowEnforceNotMet(__FILE__, __LINE__, "", ::c10::str(__VA_ARGS__))
+
+/**
+ * Rich logging messages
+ *
+ * CAFFE_ENFORCE_THAT can be used with one of the "checker functions" that
+ * capture input argument values and add it to the exception message. E.g.
+ * `CAFFE_ENFORCE_THAT(Equals(foo(x), bar(y)), "Optional additional message")`
+ * would evaluate both foo and bar only once and if the results are not equal -
+ * include them in the exception message.
+ *
+ * Some of the basic checker functions like Equals or Greater are already
+ * defined below. Other header might define customized checkers by adding
+ * functions to caffe2::enforce_detail namespace. For example:
+ *
+ *   namespace caffe2 { namespace enforce_detail {
+ *   inline EnforceFailMessage IsVector(const vector<int64_t>& shape) {
+ *     if (shape.size() == 1) { return EnforceOK(); }
+ *     return c10::str("Shape ", shape, " is not a vector");
+ *   }
+ *   }}
+ *
+ * With further usages like `CAFFE_ENFORCE_THAT(IsVector(Input(0).dims()))`
+ *
+ * Convenient wrappers for binary operations like CAFFE_ENFORCE_EQ are provided
+ * too. Please use them instead of TORCH_CHECK_EQ and friends for failures in
+ * user-provided input.
+ */
+
+namespace enforce_detail {
+
+template <typename T1, typename T2>
+std::string enforceFailMsgImpl(const T1& x, const T2& y) {
+  return c10::str(x, " vs ", y);
+}
+
+template <typename T1, typename T2, typename... Args>
+std::string enforceFailMsgImpl(const T1& x, const T2& y, const Args&... args) {
+  return c10::str(x, " vs ", y, ". ", args...);
+}
+
+template <typename Pred, typename T1, typename T2, typename GetFailMsgFunc>
+void enforceThatImpl(
+    Pred p,
+    const T1& lhs,
+    const T2& rhs,
+    const char* file,
+    int line,
+    const char* expr,
+    const void* caller,
+    GetFailMsgFunc getFailMsg) {
+  if (C10_UNLIKELY(!(p(lhs, rhs)))) {
+    ::c10::ThrowEnforceNotMet(file, line, expr, getFailMsg(lhs, rhs), caller);
+  }
+}
+
+#define CAFFE_ENFORCE_THAT_IMPL(op, lhs, rhs, expr, ...)  \
+  ::c10::enforce_detail::enforceThatImpl(                 \
+      op,                                                 \
+      (lhs),                                              \
+      (rhs),                                              \
+      __FILE__,                                           \
+      __LINE__,                                           \
+      expr,                                               \
+      nullptr,                                            \
+      [&](const auto& arg1, const auto& arg2) {           \
+        return ::c10::enforce_detail::enforceFailMsgImpl( \
+            arg1, arg2, ##__VA_ARGS__);                   \
+      })
+
+#define CAFFE_ENFORCE_THAT_IMPL_WITH_CALLER(op, lhs, rhs, expr, ...) \
+  ::c10::enforce_detail::enforceThatImpl(                            \
+      op,                                                            \
+      (lhs),                                                         \
+      (rhs),                                                         \
+      __FILE__,                                                      \
+      __LINE__,                                                      \
+      expr,                                                          \
+      this,                                                          \
+      [&](const auto& arg1, const auto& arg2) {                      \
+        return ::c10::enforce_detail::enforceFailMsgImpl(            \
+            arg1, arg2, ##__VA_ARGS__);                              \
+      })
+
+} // namespace enforce_detail
+
+#define CAFFE_ENFORCE_THAT(cmp, op, lhs, rhs, ...) \
+  CAFFE_ENFORCE_THAT_IMPL(cmp, lhs, rhs, #lhs " " #op " " #rhs, ##__VA_ARGS__)
+
+#define CAFFE_ENFORCE_BINARY_OP(cmp, op, x, y, ...) \
+  CAFFE_ENFORCE_THAT_IMPL(cmp, x, y, #x " " #op " " #y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_EQ(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP(std::equal_to<void>(), ==, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_NE(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP(std::not_equal_to<void>(), !=, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_LE(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP(std::less_equal<void>(), <=, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_LT(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP(std::less<void>(), <, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_GE(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP(std::greater_equal<void>(), >=, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_GT(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP(std::greater<void>(), >, x, y, ##__VA_ARGS__)
+
+#define CAFFE_ENFORCE_BINARY_OP_WITH_CALLER(cmp, op, x, y, ...) \
+  CAFFE_ENFORCE_THAT_IMPL_WITH_CALLER(                          \
+      cmp, x, y, #x " " #op " " #y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_EQ_WITH_CALLER(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP_WITH_CALLER(          \
+      std::equal_to<void>(), ==, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_NE_WITH_CALLER(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP_WITH_CALLER(          \
+      std::not_equal_to<void>(), !=, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_LE_WITH_CALLER(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP_WITH_CALLER(          \
+      std::less_equal<void>(), <=, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_LT_WITH_CALLER(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP_WITH_CALLER(std::less<void>(), <, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_GE_WITH_CALLER(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP_WITH_CALLER(          \
+      std::greater_equal<void>(), >=, x, y, ##__VA_ARGS__)
+#define CAFFE_ENFORCE_GT_WITH_CALLER(x, y, ...) \
+  CAFFE_ENFORCE_BINARY_OP_WITH_CALLER(          \
+      std::greater<void>(), >, x, y, ##__VA_ARGS__)
+
+struct IValue;
+class C10_API EventSampledHandler {
+ public:
+  virtual void log(
+      std::string_view model_id,
+      const std::vector<c10::IValue>& args) = 0;
+  virtual ~EventSampledHandler() = default;
+};
+
+#define C10_LOG_EVENT_SAMPLED(event, ...)                                    \
+  static const std::unique_ptr<::c10::EventSampledHandler>&                  \
+      _##event##EventSampledHandler = ::c10::GetEventSampledHandler(#event); \
+  if (_##event##EventSampledHandler) {                                       \
+    _##event##EventSampledHandler->log(__VA_ARGS__);                         \
+  }
+
+// Must be called in the main thread before any other threads are spawned.
+C10_API void InitEventSampledHandlers(
+    std::vector<
+        std::pair<std::string_view, std::unique_ptr<EventSampledHandler>>>);
+C10_API const std::unique_ptr<EventSampledHandler>& GetEventSampledHandler(
+    std::string_view);
+
+/**
+ * Very lightweight logging for the first time API usage. It's beneficial for
+ * tracking of individual functionality usage in larger applications.
+ *
+ * In order to ensure light-weightedness of logging, we utilize static variable
+ * trick - LogAPIUsage will be invoked only once and further invocations will
+ * just do an atomic check.
+ *
+ * Example:
+ *   // Logs caller info with an arbitrary text event, if there is a usage.
+ *   C10_LOG_API_USAGE_ONCE("my_api");
+ */
+#define C10_LOG_API_USAGE_ONCE(...)                        \
+  C10_UNUSED static bool C10_ANONYMOUS_VARIABLE(logFlag) = \
+      ::c10::detail::LogAPIUsageFakeReturn(__VA_ARGS__);
+
+// API usage logging capabilities
+C10_API void SetAPIUsageLogger(std::function<void(const std::string&)> logger);
+C10_API void LogAPIUsage(const std::string& context);
+
+C10_API void SetAPIUsageMetadataLogger(
+    std::function<void(
+        const std::string&,
+        const std::map<std::string, std::string>& metadata_map)> logger);
+C10_API void LogAPIUsageMetadata(
+    const std::string& context,
+    const std::map<std::string, std::string>& metadata_map);
+
+// PyTorch ddp usage logging capabilities
+// DDPLoggingData holds data that can be logged in applications
+// for analysis and debugging. Data structure is defined in
+// c10 directory so that it can be easily imported by both c10
+// and torch files.
+struct DDPLoggingData {
+  // logging fields that are string types.
+  std::map<std::string, std::string> strs_map;
+  // logging fields that are int64_t types.
+  std::map<std::string, int64_t> ints_map;
+};
+
+C10_API void SetPyTorchDDPUsageLogger(
+    std::function<void(const DDPLoggingData&)> logger);
+C10_API void LogPyTorchDDPUsage(const DDPLoggingData& ddpData);
+
+namespace detail {
+// Return value is needed to do the static variable initialization trick
+C10_API bool LogAPIUsageFakeReturn(const std::string& context);
+} // namespace detail
+
+// Initializes the c10 logger.
+C10_API void initLogging();
+
+// Sets the rank, which will be included in log messages
+C10_API void SetGlobalRank(int64_t rank);
+
+} // namespace c10
+
+#endif // C10_UTIL_LOGGING_H_

videochat2/lib/python3.10/site-packages/torch/include/c10/util/NetworkFlow.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include <c10/macros/Macros.h>
+
+#include <string>
+#include <vector>
+
+/**
+ * This file provides a network flow implementation.
+ * https://en.wikipedia.org/wiki/Flow_network
+ *
+ * It aims to mirror some of the behavior of networkx, which is/was used by
+ * functorch partitioners for splitting the graph into a forward and backward
+ * graph.
+ */
+
+namespace c10 {
+
+enum class C10_API_ENUM MinCutStatus {
+  SUCCESS = 0,
+  UNBOUNDED = 1,
+  OVERFLOW_INF = 2,
+  INVALID = 3,
+};
+
+struct MinCutResult {
+  MinCutStatus status;
+  int64_t max_flow;
+  std::vector<std::string> reachable;
+  std::vector<std::string> unreachable;
+};
+
+// Modeled after networkx implementation
+class C10_API NetworkFlowGraph {
+ public:
+  // selected such that INF + INF is < INT64_MAX
+  constexpr static int64_t INF = (1LL << 62) - 1;
+
+  struct Edge {
+    std::string source, dest;
+    int64_t capacity;
+  };
+
+  MinCutStatus add_edge(
+      const std::string& source,
+      const std::string& dest,
+      int64_t capacity = 1);
+
+  MinCutResult minimum_cut(const std::string& s, const std::string& t) const;
+
+  std::vector<Edge> edges;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/ParallelGuard.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <c10/macros/Macros.h>
+
+namespace c10 {
+
+// RAII thread local guard that tracks whether code is being executed in
+// `at::parallel_for` or `at::parallel_reduce` loop function.
+class C10_API ParallelGuard {
+ public:
+  static bool is_enabled();
+
+  ParallelGuard(bool state);
+  ~ParallelGuard();
+
+ private:
+  bool previous_state_;
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Registry.h

@@ -0,0 +1,326 @@
+#ifndef C10_UTIL_REGISTRY_H_
+#define C10_UTIL_REGISTRY_H_
+
+/**
+ * Simple registry implementation that uses static variables to
+ * register object creators during program initialization time.
+ */
+
+// NB: This Registry works poorly when you have other namespaces.
+// Make all macro invocations from inside the at namespace.
+
+#include <cstdio>
+#include <cstdlib>
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <stdexcept>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include <c10/macros/Export.h>
+#include <c10/macros/Macros.h>
+#include <c10/util/Type.h>
+
+namespace c10 {
+
+template <typename KeyType>
+inline std::string KeyStrRepr(const KeyType& /*key*/) {
+  return "[key type printing not supported]";
+}
+
+template <>
+inline std::string KeyStrRepr(const std::string& key) {
+  return key;
+}
+
+enum RegistryPriority {
+  REGISTRY_FALLBACK = 1,
+  REGISTRY_DEFAULT = 2,
+  REGISTRY_PREFERRED = 3,
+};
+
+/**
+ * @brief A template class that allows one to register classes by keys.
+ *
+ * The keys are usually a std::string specifying the name, but can be anything
+ * that can be used in a std::map.
+ *
+ * You should most likely not use the Registry class explicitly, but use the
+ * helper macros below to declare specific registries as well as registering
+ * objects.
+ */
+template <class SrcType, class ObjectPtrType, class... Args>
+class Registry {
+ public:
+  typedef std::function<ObjectPtrType(Args...)> Creator;
+
+  Registry(bool warning = true) : registry_(), priority_(), warning_(warning) {}
+
+  void Register(
+      const SrcType& key,
+      Creator creator,
+      const RegistryPriority priority = REGISTRY_DEFAULT) {
+    std::lock_guard<std::mutex> lock(register_mutex_);
+    // The if statement below is essentially the same as the following line:
+    // TORCH_CHECK_EQ(registry_.count(key), 0) << "Key " << key
+    //                                   << " registered twice.";
+    // However, TORCH_CHECK_EQ depends on google logging, and since registration
+    // is carried out at static initialization time, we do not want to have an
+    // explicit dependency on glog's initialization function.
+    if (registry_.count(key) != 0) {
+      auto cur_priority = priority_[key];
+      if (priority > cur_priority) {
+#ifdef DEBUG
+        std::string warn_msg =
+            "Overwriting already registered item for key " + KeyStrRepr(key);
+        fprintf(stderr, "%s\n", warn_msg.c_str());
+#endif
+        registry_[key] = creator;
+        priority_[key] = priority;
+      } else if (priority == cur_priority) {
+        std::string err_msg =
+            "Key already registered with the same priority: " + KeyStrRepr(key);
+        fprintf(stderr, "%s\n", err_msg.c_str());
+        if (terminate_) {
+          std::exit(1);
+        } else {
+          throw std::runtime_error(err_msg);
+        }
+      } else if (warning_) {
+        std::string warn_msg =
+            "Higher priority item already registered, skipping registration of " +
+            KeyStrRepr(key);
+        fprintf(stderr, "%s\n", warn_msg.c_str());
+      }
+    } else {
+      registry_[key] = creator;
+      priority_[key] = priority;
+    }
+  }
+
+  void Register(
+      const SrcType& key,
+      Creator creator,
+      const std::string& help_msg,
+      const RegistryPriority priority = REGISTRY_DEFAULT) {
+    Register(key, creator, priority);
+    help_message_[key] = help_msg;
+  }
+
+  inline bool Has(const SrcType& key) {
+    return (registry_.count(key) != 0);
+  }
+
+  ObjectPtrType Create(const SrcType& key, Args... args) {
+    auto it = registry_.find(key);
+    if (it == registry_.end()) {
+      // Returns nullptr if the key is not registered.
+      return nullptr;
+    }
+    return it->second(args...);
+  }
+
+  /**
+   * Returns the keys currently registered as a std::vector.
+   */
+  std::vector<SrcType> Keys() const {
+    std::vector<SrcType> keys;
+    keys.reserve(registry_.size());
+    for (const auto& it : registry_) {
+      keys.push_back(it.first);
+    }
+    return keys;
+  }
+
+  inline const std::unordered_map<SrcType, std::string>& HelpMessage() const {
+    return help_message_;
+  }
+
+  const char* HelpMessage(const SrcType& key) const {
+    auto it = help_message_.find(key);
+    if (it == help_message_.end()) {
+      return nullptr;
+    }
+    return it->second.c_str();
+  }
+
+  // Used for testing, if terminate is unset, Registry throws instead of
+  // calling std::exit
+  void SetTerminate(bool terminate) {
+    terminate_ = terminate;
+  }
+
+ private:
+  std::unordered_map<SrcType, Creator> registry_;
+  std::unordered_map<SrcType, RegistryPriority> priority_;
+  bool terminate_{true};
+  const bool warning_;
+  std::unordered_map<SrcType, std::string> help_message_;
+  std::mutex register_mutex_;
+
+  C10_DISABLE_COPY_AND_ASSIGN(Registry);
+};
+
+template <class SrcType, class ObjectPtrType, class... Args>
+class Registerer {
+ public:
+  explicit Registerer(
+      const SrcType& key,
+      Registry<SrcType, ObjectPtrType, Args...>* registry,
+      typename Registry<SrcType, ObjectPtrType, Args...>::Creator creator,
+      const std::string& help_msg = "") {
+    registry->Register(key, creator, help_msg);
+  }
+
+  explicit Registerer(
+      const SrcType& key,
+      const RegistryPriority priority,
+      Registry<SrcType, ObjectPtrType, Args...>* registry,
+      typename Registry<SrcType, ObjectPtrType, Args...>::Creator creator,
+      const std::string& help_msg = "") {
+    registry->Register(key, creator, help_msg, priority);
+  }
+
+  template <class DerivedType>
+  static ObjectPtrType DefaultCreator(Args... args) {
+    return ObjectPtrType(new DerivedType(args...));
+  }
+};
+
+/**
+ * C10_DECLARE_TYPED_REGISTRY is a macro that expands to a function
+ * declaration, as well as creating a convenient typename for its corresponding
+ * registerer.
+ */
+// Note on C10_IMPORT and C10_EXPORT below: we need to explicitly mark DECLARE
+// as import and DEFINE as export, because these registry macros will be used
+// in downstream shared libraries as well, and one cannot use *_API - the API
+// macro will be defined on a per-shared-library basis. Semantically, when one
+// declares a typed registry it is always going to be IMPORT, and when one
+// defines a registry (which should happen ONLY ONCE and ONLY IN SOURCE FILE),
+// the instantiation unit is always going to be exported.
+//
+// The only unique condition is when in the same file one does DECLARE and
+// DEFINE - in Windows compilers, this generates a warning that dllimport and
+// dllexport are mixed, but the warning is fine and linker will be properly
+// exporting the symbol. Same thing happens in the gflags flag declaration and
+// definition caes.
+#define C10_DECLARE_TYPED_REGISTRY(                                      \
+    RegistryName, SrcType, ObjectType, PtrType, ...)                     \
+  C10_API ::c10::Registry<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>*  \
+  RegistryName();                                                        \
+  typedef ::c10::Registerer<SrcType, PtrType<ObjectType>, ##__VA_ARGS__> \
+      Registerer##RegistryName
+
+#define TORCH_DECLARE_TYPED_REGISTRY(                                     \
+    RegistryName, SrcType, ObjectType, PtrType, ...)                      \
+  TORCH_API ::c10::Registry<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>* \
+  RegistryName();                                                         \
+  typedef ::c10::Registerer<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>  \
+      Registerer##RegistryName
+
+#define C10_DEFINE_TYPED_REGISTRY(                                         \
+    RegistryName, SrcType, ObjectType, PtrType, ...)                       \
+  C10_EXPORT ::c10::Registry<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>* \
+  RegistryName() {                                                         \
+    static ::c10::Registry<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>*   \
+        registry = new ::c10::                                             \
+            Registry<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>();       \
+    return registry;                                                       \
+  }
+
+#define C10_DEFINE_TYPED_REGISTRY_WITHOUT_WARNING(                            \
+    RegistryName, SrcType, ObjectType, PtrType, ...)                          \
+  C10_EXPORT ::c10::Registry<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>*    \
+  RegistryName() {                                                            \
+    static ::c10::Registry<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>*      \
+        registry =                                                            \
+            new ::c10::Registry<SrcType, PtrType<ObjectType>, ##__VA_ARGS__>( \
+                false);                                                       \
+    return registry;                                                          \
+  }
+
+// Note(Yangqing): The __VA_ARGS__ below allows one to specify a templated
+// creator with comma in its templated arguments.
+#define C10_REGISTER_TYPED_CREATOR(RegistryName, key, ...)                  \
+  static Registerer##RegistryName C10_ANONYMOUS_VARIABLE(g_##RegistryName)( \
+      key, RegistryName(), ##__VA_ARGS__);
+
+#define C10_REGISTER_TYPED_CREATOR_WITH_PRIORITY(                           \
+    RegistryName, key, priority, ...)                                       \
+  static Registerer##RegistryName C10_ANONYMOUS_VARIABLE(g_##RegistryName)( \
+      key, priority, RegistryName(), ##__VA_ARGS__);
+
+#define C10_REGISTER_TYPED_CLASS(RegistryName, key, ...)                    \
+  static Registerer##RegistryName C10_ANONYMOUS_VARIABLE(g_##RegistryName)( \
+      key,                                                                  \
+      RegistryName(),                                                       \
+      Registerer##RegistryName::DefaultCreator<__VA_ARGS__>,                \
+      ::c10::demangle_type<__VA_ARGS__>());
+
+#define C10_REGISTER_TYPED_CLASS_WITH_PRIORITY(                             \
+    RegistryName, key, priority, ...)                                       \
+  static Registerer##RegistryName C10_ANONYMOUS_VARIABLE(g_##RegistryName)( \
+      key,                                                                  \
+      priority,                                                             \
+      RegistryName(),                                                       \
+      Registerer##RegistryName::DefaultCreator<__VA_ARGS__>,                \
+      ::c10::demangle_type<__VA_ARGS__>());
+
+// C10_DECLARE_REGISTRY and C10_DEFINE_REGISTRY are hard-wired to use
+// std::string as the key type, because that is the most commonly used cases.
+#define C10_DECLARE_REGISTRY(RegistryName, ObjectType, ...) \
+  C10_DECLARE_TYPED_REGISTRY(                               \
+      RegistryName, std::string, ObjectType, std::unique_ptr, ##__VA_ARGS__)
+
+#define TORCH_DECLARE_REGISTRY(RegistryName, ObjectType, ...) \
+  TORCH_DECLARE_TYPED_REGISTRY(                               \
+      RegistryName, std::string, ObjectType, std::unique_ptr, ##__VA_ARGS__)
+
+#define C10_DEFINE_REGISTRY(RegistryName, ObjectType, ...) \
+  C10_DEFINE_TYPED_REGISTRY(                               \
+      RegistryName, std::string, ObjectType, std::unique_ptr, ##__VA_ARGS__)
+
+#define C10_DEFINE_REGISTRY_WITHOUT_WARNING(RegistryName, ObjectType, ...) \
+  C10_DEFINE_TYPED_REGISTRY_WITHOUT_WARNING(                               \
+      RegistryName, std::string, ObjectType, std::unique_ptr, ##__VA_ARGS__)
+
+#define C10_DECLARE_SHARED_REGISTRY(RegistryName, ObjectType, ...) \
+  C10_DECLARE_TYPED_REGISTRY(                                      \
+      RegistryName, std::string, ObjectType, std::shared_ptr, ##__VA_ARGS__)
+
+#define TORCH_DECLARE_SHARED_REGISTRY(RegistryName, ObjectType, ...) \
+  TORCH_DECLARE_TYPED_REGISTRY(                                      \
+      RegistryName, std::string, ObjectType, std::shared_ptr, ##__VA_ARGS__)
+
+#define C10_DEFINE_SHARED_REGISTRY(RegistryName, ObjectType, ...) \
+  C10_DEFINE_TYPED_REGISTRY(                                      \
+      RegistryName, std::string, ObjectType, std::shared_ptr, ##__VA_ARGS__)
+
+#define C10_DEFINE_SHARED_REGISTRY_WITHOUT_WARNING( \
+    RegistryName, ObjectType, ...)                  \
+  C10_DEFINE_TYPED_REGISTRY_WITHOUT_WARNING(        \
+      RegistryName, std::string, ObjectType, std::shared_ptr, ##__VA_ARGS__)
+
+// C10_REGISTER_CREATOR and C10_REGISTER_CLASS are hard-wired to use std::string
+// as the key
+// type, because that is the most commonly used cases.
+#define C10_REGISTER_CREATOR(RegistryName, key, ...) \
+  C10_REGISTER_TYPED_CREATOR(RegistryName, #key, __VA_ARGS__)
+
+#define C10_REGISTER_CREATOR_WITH_PRIORITY(RegistryName, key, priority, ...) \
+  C10_REGISTER_TYPED_CREATOR_WITH_PRIORITY(                                  \
+      RegistryName, #key, priority, __VA_ARGS__)
+
+#define C10_REGISTER_CLASS(RegistryName, key, ...) \
+  C10_REGISTER_TYPED_CLASS(RegistryName, #key, __VA_ARGS__)
+
+#define C10_REGISTER_CLASS_WITH_PRIORITY(RegistryName, key, priority, ...) \
+  C10_REGISTER_TYPED_CLASS_WITH_PRIORITY(                                  \
+      RegistryName, #key, priority, __VA_ARGS__)
+
+} // namespace c10
+
+#endif // C10_UTIL_REGISTRY_H_

videochat2/lib/python3.10/site-packages/torch/include/c10/util/ScopeExit.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <type_traits>
+#include <utility>
+
+namespace c10 {
+
+/**
+ * Mostly copied from https://llvm.org/doxygen/ScopeExit_8h_source.html
+ */
+template <typename Callable>
+class scope_exit {
+  Callable ExitFunction;
+  bool Engaged = true; // False once moved-from or release()d.
+
+ public:
+  template <typename Fp>
+  // NOLINTNEXTLINE(bugprone-forwarding-reference-overload)
+  explicit scope_exit(Fp&& F) : ExitFunction(std::forward<Fp>(F)) {}
+
+  scope_exit(scope_exit&& Rhs) noexcept
+      : ExitFunction(std::move(Rhs.ExitFunction)), Engaged(Rhs.Engaged) {
+    Rhs.release();
+  }
+  scope_exit(const scope_exit&) = delete;
+  scope_exit& operator=(scope_exit&&) = delete;
+  scope_exit& operator=(const scope_exit&) = delete;
+
+  void release() {
+    Engaged = false;
+  }
+
+  ~scope_exit() {
+    if (Engaged) {
+      ExitFunction();
+    }
+  }
+};
+
+// Keeps the callable object that is passed in, and execute it at the
+// destruction of the returned object (usually at the scope exit where the
+// returned object is kept).
+//
+// Interface is specified by p0052r2.
+template <typename Callable>
+scope_exit<std::decay_t<Callable>> make_scope_exit(Callable&& F) {
+  return scope_exit<std::decay_t<Callable>>(std::forward<Callable>(F));
+}
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/SmallBuffer.h

@@ -0,0 +1,87 @@
+#pragma once
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <type_traits>
+
+/** Helper class for allocating temporary fixed size arrays with SBO.
+ *
+ * This is intentionally much simpler than SmallVector, to improve performance
+ * at the expense of many features:
+ * - No zero-initialization for numeric types
+ * - No resizing after construction
+ * - No copy/move
+ * - No non-trivial types
+ */
+
+namespace c10 {
+
+template <typename T, size_t N>
+class SmallBuffer {
+  static_assert(std::is_trivial_v<T>, "SmallBuffer is intended for POD types");
+
+  std::array<T, N> storage_;
+  size_t size_{};
+  T* data_{};
+
+ public:
+  SmallBuffer(size_t size) : size_(size) {
+    if (size > N) {
+      data_ = new T[size];
+    } else {
+      data_ = &storage_[0];
+    }
+  }
+
+  SmallBuffer(const SmallBuffer&) = delete;
+  SmallBuffer& operator=(const SmallBuffer&) = delete;
+
+  // move constructor is needed in function return
+  SmallBuffer(SmallBuffer&& rhs) noexcept : size_{rhs.size_} {
+    rhs.size_ = 0;
+    if (size_ > N) {
+      data_ = rhs.data_;
+      rhs.data_ = nullptr;
+    } else {
+      storage_ = std::move(rhs.storage_);
+      data_ = &storage_[0];
+    }
+  }
+
+  SmallBuffer& operator=(SmallBuffer&&) = delete;
+
+  ~SmallBuffer() {
+    if (size_ > N) {
+      delete[] data_;
+    }
+  }
+  T& operator[](size_t idx) {
+    return data()[idx];
+  }
+  const T& operator[](size_t idx) const {
+    return data()[idx];
+  }
+  T* data() {
+    return data_;
+  }
+  const T* data() const {
+    return data_;
+  }
+  size_t size() const {
+    return size_;
+  }
+  T* begin() {
+    return data_;
+  }
+  const T* begin() const {
+    return data_;
+  }
+  T* end() {
+    return data_ + size_;
+  }
+  const T* end() const {
+    return data_ + size_;
+  }
+};
+
+} // namespace c10

videochat2/lib/python3.10/site-packages/torch/include/c10/util/StringUtil.h

@@ -0,0 +1,211 @@
+#ifndef C10_UTIL_STRINGUTIL_H_
+#define C10_UTIL_STRINGUTIL_H_
+
+#include <c10/macros/Macros.h>
+#include <c10/util/string_utils.h>
+#include <c10/util/string_view.h>
+
+#include <cstddef>
+#include <ostream>
+#include <sstream>
+#include <string>
+
+C10_CLANG_DIAGNOSTIC_PUSH()
+#if C10_CLANG_HAS_WARNING("-Wshorten-64-to-32")
+C10_CLANG_DIAGNOSTIC_IGNORE("-Wshorten-64-to-32")
+#endif
+
+namespace c10 {
+
+namespace detail {
+
+// Obtains the base name from a full path.
+C10_API std::string StripBasename(const std::string& full_path);
+
+C10_API std::string ExcludeFileExtension(const std::string& full_path);
+
+struct CompileTimeEmptyString {
+  operator const std::string&() const {
+    static const std::string empty_string_literal;
+    return empty_string_literal;
+  }
+  operator const char*() const {
+    return "";
+  }
+};
+
+template <typename T>
+struct CanonicalizeStrTypes {
+  using type = const T&;
+};
+
+template <size_t N>
+// NOLINTNEXTLINE(*c-arrays*)
+struct CanonicalizeStrTypes<char[N]> {
+  using type = const char*;
+};
+
+inline std::ostream& _str(std::ostream& ss) {
+  return ss;
+}
+
+template <typename T>
+inline std::ostream& _str(std::ostream& ss, const T& t) {
+  // NOLINTNEXTLINE(clang-analyzer-core.CallAndMessage)
+  ss << t;
+  return ss;
+}
+
+// Overloads of _str for wide types; forces narrowing.
+C10_API std::ostream& _str(std::ostream& ss, const wchar_t* wCStr);
+C10_API std::ostream& _str(std::ostream& ss, const wchar_t& wChar);
+C10_API std::ostream& _str(std::ostream& ss, const std::wstring& wString);
+
+template <>
+inline std::ostream& _str<CompileTimeEmptyString>(
+    std::ostream& ss,
+    const CompileTimeEmptyString&) {
+  return ss;
+}
+
+template <typename T, typename... Args>
+inline std::ostream& _str(std::ostream& ss, const T& t, const Args&... args) {
+  return _str(_str(ss, t), args...);
+}
+
+template <typename... Args>
+struct _str_wrapper final {
+  static std::string call(const Args&... args) {
+    std::ostringstream ss;
+    _str(ss, args...);
+    return ss.str();
+  }
+};
+
+// Specializations for already-a-string types.
+template <>
+struct _str_wrapper<std::string> final {
+  // return by reference to avoid the binary size of a string copy
+  static const std::string& call(const std::string& str) {
+    return str;
+  }
+};
+
+template <>
+struct _str_wrapper<const char*> final {
+  static const char* call(const char* str) {
+    return str;
+  }
+};
+
+// For c10::str() with an empty argument list (which is common in our assert
+// macros), we don't want to pay the binary size for constructing and
+// destructing a stringstream or even constructing a string.
+template <>
+struct _str_wrapper<> final {
+  static CompileTimeEmptyString call() {
+    return CompileTimeEmptyString();
+  }
+};
+
+} // namespace detail
+
+// Convert a list of string-like arguments into a single string.
+template <typename... Args>
+inline decltype(auto) str(const Args&... args) {
+  return detail::_str_wrapper<
+      typename detail::CanonicalizeStrTypes<Args>::type...>::call(args...);
+}
+
+template <class Container>
+inline std::string Join(const std::string& delimiter, const Container& v) {
+  std::stringstream s;
+  int cnt = static_cast<int64_t>(v.size()) - 1;
+  for (auto i = v.begin(); i != v.end(); ++i, --cnt) {
+    s << (*i) << (cnt ? delimiter : "");
+  }
+  return s.str();
+}
+
+// Replace all occurrences of "from" substring to "to" string.
+// Returns number of replacements
+size_t C10_API
+ReplaceAll(std::string& s, c10::string_view from, c10::string_view to);
+
+/// Represents a location in source code (for debugging).
+struct C10_API SourceLocation {
+  const char* function;
+  const char* file;
+  uint32_t line;
+};
+
+std::ostream& operator<<(std::ostream& out, const SourceLocation& loc);
+
+// unix isprint but insensitive to locale
+inline bool isPrint(char s) {
+  return s > 0x1f && s < 0x7f;
+}
+
+inline void printQuotedString(std::ostream& stmt, const string_view str) {
+  stmt << "\"";
+  for (auto s : str) {
+    switch (s) {
+      case '\\':
+        stmt << "\\\\";
+        break;
+      case '\'':
+        stmt << "\\'";
+        break;
+      case '\"':
+        stmt << "\\\"";
+        break;
+      case '\a':
+        stmt << "\\a";
+        break;
+      case '\b':
+        stmt << "\\b";
+        break;
+      case '\f':
+        stmt << "\\f";
+        break;
+      case '\n':
+        stmt << "\\n";
+        break;
+      case '\r':
+        stmt << "\\r";
+        break;
+      case '\t':
+        stmt << "\\t";
+        break;
+      case '\v':
+        stmt << "\\v";
+        break;
+      default:
+        if (isPrint(s)) {
+          stmt << s;
+        } else {
+          // C++ io has stateful formatting settings. Messing with
+          // them is probably worse than doing this manually.
+          // NOLINTNEXTLINE(*c-arrays*)
+          char buf[4] = "000";
+          // NOLINTNEXTLINE(*narrowing-conversions)
+          buf[2] += s % 8;
+          s /= 8;
+          // NOLINTNEXTLINE(*narrowing-conversions)
+          buf[1] += s % 8;
+          s /= 8;
+          // NOLINTNEXTLINE(*narrowing-conversions)
+          buf[0] += s;
+          stmt << "\\" << buf;
+        }
+        break;
+    }
+  }
+  stmt << "\"";
+}
+
+} // namespace c10
+
+C10_CLANG_DIAGNOSTIC_POP()
+
+#endif // C10_UTIL_STRINGUTIL_H_

videochat2/lib/python3.10/site-packages/torch/include/c10/util/Synchronized.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <mutex>
+
+namespace c10 {
+
+/**
+ * A very simple Synchronization class for error-free use of data
+ * in a multi-threaded context. See folly/docs/Synchronized.md for
+ * the inspiration of this class.
+ *
+ * Full URL:
+ * https://github.com/facebook/folly/blob/main/folly/docs/Synchronized.md
+ *
+ * This class implements a small subset of the generic functionality
+ * implemented by folly:Synchronized<T>. Specifically, only withLock<T>
+ * is implemented here since it's the smallest possible API that is
+ * able to cover a large surface area of functionality offered by
+ * folly::Synchronized<T>.
+ */
+template <typename T>
+class Synchronized final {
+  mutable std::mutex mutex_;
+  T data_;
+
+ public:
+  Synchronized() = default;
+  Synchronized(T const& data) : data_(data) {}
+  Synchronized(T&& data) : data_(std::move(data)) {}
+
+  // Don't permit copy construction, move, assignment, or
+  // move assignment, since the underlying std::mutex
+  //  isn't necessarily copyable/moveable.
+  Synchronized(Synchronized const&) = delete;
+  Synchronized(Synchronized&&) = delete;
+  Synchronized operator=(Synchronized const&) = delete;
+  Synchronized operator=(Synchronized&&) = delete;
+
+  /**
+   * To use, call withLock<T> with a callback that accepts T either
+   * by copy or by reference. Use the protected variable in the
+   * provided callback safely.
+   */
+  template <typename CB>
+  auto withLock(CB&& cb) {
+    std::lock_guard<std::mutex> guard(this->mutex_);
+    return std::forward<CB>(cb)(this->data_);
+  }
+
+  /**
+   * To use, call withLock<T> with a callback that accepts T either
+   * by copy or by const reference. Use the protected variable in
+   * the provided callback safely.
+   */
+  template <typename CB>
+  auto withLock(CB&& cb) const {
+    std::lock_guard<std::mutex> guard(this->mutex_);
+    return std::forward<CB>(cb)(this->data_);
+  }
+};
+} // end namespace c10