99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#ifndef TENSORFLOW_CC_EXPERIMENTAL_BASE_PUBLIC_TENSORHANDLE_H_
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#define TENSORFLOW_CC_EXPERIMENTAL_BASE_PUBLIC_TENSORHANDLE_H_
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#include <memory>
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#include <vector>
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#include "tensorflow/c/eager/c_api.h"
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#include "tensorflow/c/eager/c_api_experimental.h"
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#include "tensorflow/cc/experimental/base/public/runtime.h"
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#include "tensorflow/cc/experimental/base/public/status.h"
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#include "tensorflow/cc/experimental/base/public/tensor.h"
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namespace tensorflow {
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namespace experimental {
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namespace cc {
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// An opaque representation of a tensor computed/managed by the Tensorflow
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// runtime (tensorflow:cc::Runtime). Unlike a tensor, a Tensorhandle may refer
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// to tensors placed in memory of different devices or remote address spaces.
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// Note that tensorflow::cc::Runtime MUST outlive all TensorHandles created
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// from it.
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class TensorHandle {
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public:
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// Unwraps a Tensor from the given TensorHandle. If an error occurred,
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// status->ok() will be false, and the returned Tensor must not be used.
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Tensor Resolve(Status* status);
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// Constructs a TensorHandle from a Tensor. If an error occurred,
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// status->ok() will be false, and the returned TensorHandle must not be used.
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static TensorHandle FromTensor(const Tensor& tensor, const Runtime& runtime,
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Status* status);
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// TensorHandle is movable, and not copyable
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TensorHandle(TensorHandle&&) = default;
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TensorHandle& operator=(TensorHandle&&) = default;
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private:
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// Wraps a TFE_TensorHandle. Takes ownership of handle.
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explicit TensorHandle(TFE_TensorHandle* handle) : handle_(handle) {}
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// TensorHandle is not copyable
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TensorHandle(const TensorHandle&) = delete;
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TensorHandle& operator=(const TensorHandle&) = delete;
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// Returns the underlying TFE_TensorHandle that this object wraps.
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// This object retains ownership of the pointer.
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TFE_TensorHandle* GetTFETensorHandle() const { return handle_.get(); }
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// Deletes the currently wrapped TFE_TensorHandle, and swaps it with handle,
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// and takes ownership of handle.
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void Reset(TFE_TensorHandle* handle) { handle_.reset(handle); }
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struct TFETensorHandleDeleter {
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void operator()(TFE_TensorHandle* p) const { TFE_DeleteTensorHandle(p); }
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};
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std::unique_ptr<TFE_TensorHandle, TFETensorHandleDeleter> handle_;
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};
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inline Tensor TensorHandle::Resolve(Status* status) {
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TF_Tensor* tensor =
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TFE_TensorHandleResolve(handle_.get(), status->GetTFStatus());
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if (!status->ok()) {
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return Tensor(nullptr);
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}
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return Tensor(tensor);
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}
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inline TensorHandle TensorHandle::FromTensor(const Tensor& tensor,
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const Runtime& runtime,
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Status* status) {
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TFE_TensorHandle* tensor_handle = TFE_NewTensorHandleFromTensor(
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runtime.GetTFEContext(), tensor.GetTFTensor(), status->GetTFStatus());
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if (!status->ok()) {
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return TensorHandle(nullptr);
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}
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return TensorHandle(tensor_handle);
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}
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} // namespace cc
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} // namespace experimental
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} // namespace tensorflow
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#endif // TENSORFLOW_CC_EXPERIMENTAL_BASE_PUBLIC_TENSORHANDLE_H_
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