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// Copyright © 2022 Apple Inc.
#pragma once
#include <ATen/core/Generator.h>
#include <ATen/core/PhiloxRNGEngine.h>
#include <c10/core/GeneratorImpl.h>
#include <optional>
namespace at {
namespace mps::detail {
constexpr uint32_t PHILOX_STATE_N = 7;
struct rng_data_pod {
std::array<uint32_t, PHILOX_STATE_N> state{1};
uint64_t seed = default_rng_seed_val;
};
TORCH_API const Generator& getDefaultMPSGenerator();
TORCH_API Generator
createMPSGenerator(uint64_t seed_val = default_rng_seed_val);
} // namespace mps::detail
struct TORCH_API MPSGeneratorImpl : public c10::GeneratorImpl {
// Constructors
MPSGeneratorImpl(uint64_t seed_in = default_rng_seed_val);
~MPSGeneratorImpl() override = default;
// MPSGeneratorImpl methods
std::shared_ptr<MPSGeneratorImpl> clone() const;
void set_current_seed(uint64_t seed) override;
void set_offset(uint64_t offset) override;
uint64_t get_offset() const override;
uint64_t current_seed() const override;
uint64_t seed() override;
void set_state(const c10::TensorImpl& new_state) override;
c10::intrusive_ptr<c10::TensorImpl> get_state() const override;
void update_philox_counters();
void set_engine(at::Philox4_32 engine) {
engine_ = engine;
}
at::Philox4_32 engine() {
return engine_;
}
uint32_t* state_data() {
return data_.state.data();
}
static DeviceType device_type() {
return DeviceType::MPS;
}
private:
mps::detail::rng_data_pod data_;
at::Philox4_32 engine_;
MPSGeneratorImpl* clone_impl() const override;
};
} // namespace at
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