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ab57f6d12c
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/70069 This commit upstreams utils to extract BackendDevice from at::Tensor. Test Plan: ./build/bin/test_lazy --gtest_filter=BackendDeviceTest.GetBackendDevice* Reviewed By: samdow Differential Revision: D33293160 Pulled By: alanwaketan fbshipit-source-id: 78647239f90b4d04adce84ae6022b8983ad30c09
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
#include <torch/csrc/lazy/backend/backend_device.h>
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#include <c10/core/Device.h>
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#include <c10/util/Exception.h>
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#include <c10/util/StringUtil.h>
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#include <torch/csrc/lazy/core/tensor.h>
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#include <torch/csrc/lazy/backend/backend_interface.h>
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namespace torch {
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namespace lazy {
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// TODO(alanwaketan): Use the backend API to get the default device type.
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// In the future, we should also get the default device ordinal.
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BackendDevice::BackendDevice()
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: type_(std::make_shared<BackendDeviceType>()) {}
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BackendDevice::BackendDevice(std::shared_ptr<BackendDeviceType>&& type, int64_t ordinal)
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: type_(std::move(type)), ordinal_(ordinal) {}
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BackendDevice::BackendDevice(const std::string& device_spec)
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: BackendDevice::BackendDevice() {}
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int8_t BackendDevice::type() const {
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TORCH_INTERNAL_ASSERT(type_);
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return type_->type;
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}
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std::string BackendDevice::toString() const {
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TORCH_INTERNAL_ASSERT(type_);
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return c10::str(type_->toString(), ordinal_);
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}
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int BackendDevice::compare(const BackendDevice& rhs) const {
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if (type() != rhs.type()) {
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return type() < rhs.type() ? -1 : +1;
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}
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return ordinal_ < rhs.ordinal_ ? -1 : (ordinal_ > rhs.ordinal_ ? +1 : 0);
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}
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std::ostream& operator<<(std::ostream& os, const BackendDevice& device) {
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os << device.toString();
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return os;
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}
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// TODO(whc) refactor this: we need to support non-zero default ordinal for torch/XLA.
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BackendDevice atenDeviceToBackendDevice(const c10::Device& device) {
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TORCH_CHECK(device.type() == at::kLazy, device);
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int64_t ordinal = device.has_index() ? device.index() : 0;
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return BackendDevice(getBackend()->GetDefaultDeviceType(), ordinal);
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}
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// TODO(whc) refactor this: we need to support non 1 on 1 mapping for torch/XLA.
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c10::Device backendDeviceToAtenDevice(const BackendDevice& device) {
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return c10::Device(at::kLazy, device.ordinal());
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}
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c10::optional<BackendDevice> GetBackendDevice(const at::Tensor& tensor) {
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if (auto lt = TryGetLtcTensor(tensor)) {
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return lt.GetDevice();
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}
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return c10::nullopt;
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}
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c10::optional<BackendDevice> GetBackendDevice() {
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return c10::nullopt;
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}
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} // namespace lazy
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} // namespace torch
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