79 lines
2.5 KiB
79 lines
2.5 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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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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#pragma once
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namespace paddle {
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namespace framework {
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class Tensor {
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using paddle::platform::Place;
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using paddle::platform::get_place;
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public:
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template <typename T>
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const T* data() const {
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PADDLE_ASSERT(holder_ != nullptr,
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"Tensor::data must be called after Tensor::mutable_data");
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return static_cast<const T*>(holder->Ptr());
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}
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template <typename T, // must be POD types
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typename = std::enable_if<std::is_pod<T>::value>::type>
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T* mutable_data(DDim dims, Place place) {
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if (holder_ == nullptr || holder_->Place() != place ||
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holder_->Size() < dims.product() * sizeof(T)) {
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holder_.reset(new PlaceholderImpl(place, dims.product() * sizeof(T)));
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}
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return static_cast<T*>(holder_->Ptr());
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}
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template <typename T, // must be POD types
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typename = std::enable_if<std::is_pod<T>::value>::type>
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T* mutable_data(DDim dims) {
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return mutable_data<T>(dims, paddle::platform::get_place());
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}
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private:
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// Placeholder hides type T, so it doesn't appear as a template
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// parameter of Variable.
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struct Placeholder {
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virtual ~Placeholder() {}
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virtual void* Ptr() const = 0;
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virtual Place Place() const = 0;
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virtual size_t Size() const = 0;
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};
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template <typename T>
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struct PlaceholderImpl : public Placeholder {
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PlaceholderImpl(Place pl, size_t size)
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: ptr_(paddle::memory::Alloc(pl, size), paddle::memory::Deleter(pl)),
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place_(pl),
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size_(size) {}
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virtual void* Ptr() const { return static_cast<void*>(ptr_.get()); }
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virtual size_t Size() const { return size_; }
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virtual Place Place() const { return place_; }
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std::unique_ptr<T, memory::Deleter> ptr_;
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Place place_; // record the place of ptr_.
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size_t size_; // size of the memory block.
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};
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std::unique_ptr<Placeholder> holder_; // holds the memory block if allocated.
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};
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} // namespace framework
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} // namespace paddle
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