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97 lines
2.8 KiB
97 lines
2.8 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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#include "Projection.h"
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namespace paddle {
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/**
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* SliceProjection can slice the input value into multiple parts,
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* and then select some of them to merge into a new output.
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*
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* First, calculate the slices that need to be merged into the output.
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* slices = input.slices().for_output()
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*
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* Second, merge each slice into the output.
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* for(auto slice: slices) {
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* out.addAtOffset(slice, offset);
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* }
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*
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* Input slices as output: s0, s1, ...:
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* -----------------------
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* |///| |//////| |
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* |/s0| |//s1//| |
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* |///| |//////| |
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* -----------------------
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* Output, merge s0, s1, ... into one output:
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* ----------------
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* |///|//////| |
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* |/s0|//s1//|...|
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* |///|//////| |
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* ----------------
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*
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* The config file api is slice_projection.
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*/
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class SliceProjection : public Projection {
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public:
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SliceProjection(const ProjectionConfig& config,
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const ParameterPtr& parameter,
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bool useGpu);
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virtual void forward();
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virtual void backward(const UpdateCallback& callback);
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protected:
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std::vector<std::pair<size_t, size_t>> slices_;
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};
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REGISTER_PROJECTION(slice, SliceProjection);
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/**
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* Constructed function.
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* @note SliceProjection should not have any parameter.
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*/
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SliceProjection::SliceProjection(const ProjectionConfig& config,
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const ParameterPtr& parameter,
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bool useGpu)
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: Projection(config, parameter, useGpu) {
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CHECK(!parameter) << "'slice' projection should not have any parameter";
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slices_.reserve(config.slices_size());
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for (const auto& slice : config.slices()) {
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slices_.push_back(std::make_pair(slice.start(), slice.end()));
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}
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}
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void SliceProjection::forward() {
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size_t offset = 0;
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for (auto& slice : slices_) {
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auto slice_out = in_->value->subColMatrix(slice.first, slice.second);
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out_->value->addAtOffset(*slice_out, offset);
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offset += slice_out->getWidth();
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}
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}
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void SliceProjection::backward(const UpdateCallback& callback) {
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if (in_->grad) {
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size_t offset = 0;
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for (auto& slice : slices_) {
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auto slice_out = in_->grad->subColMatrix(slice.first, slice.second);
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slice_out->addAtOffset(*out_->grad, offset);
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offset += slice_out->getWidth();
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}
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}
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}
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} // namespace paddle
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