#pragma once
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#include <ATen/ATen.h>
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#include "c10/core/Device.h"
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#include "c10/core/DeviceType.h"
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#include "c10/core/Stream.h"
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#include "c10/core/impl/DeviceGuardImplInterface.h"
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#include <cstdint>
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namespace torch { namespace autograd {
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/**
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* Records type, shape, and device of tensor and, where applicable,
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* the stream the correspondingoperation took place on.
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*
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* If is_valid() is false, then the corresponding input is not used and may be
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* an undefined tensor.
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*/
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struct InputMetadata {
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InputMetadata() = default;
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InputMetadata(const at::DeprecatedTypeProperties& type, at::IntArrayRef shape, at::Device device)
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: type_{&type}, shape_{shape}, device_{device} {
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stream_ = c10::impl::getDeviceGuardImpl(device_.type())->getStream(device_);
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}
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InputMetadata(const at::Tensor& t)
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: InputMetadata(t.type(), t.sizes(), t.device()) { }
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bool is_valid() const {
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return type_ != nullptr;
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}
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const at::DeprecatedTypeProperties& type() const {
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AT_ASSERT(type_);
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return *type_;
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}
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at::IntArrayRef shape() const {
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return shape_;
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}
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at::Device device() const {
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return device_;
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}
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c10::Stream stream() const {
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return stream_;
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}
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at::Tensor zeros_like() const {
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return at::zeros(shape_, type_->options(device_));
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}
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private:
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const at::DeprecatedTypeProperties* type_ = nullptr;
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at::DimVector shape_;
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at::Device device_ = at::kCPU;
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c10::Stream stream_ = c10::Stream(c10::Stream::Default::DEFAULT, device_);
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};
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}} // torch::autograd
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