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98 lines
2.6 KiB
98 lines
2.6 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 "Layer.h"
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#include "paddle/math/Matrix.h"
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#include "paddle/utils/Logging.h"
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#include "paddle/utils/Stat.h"
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namespace paddle {
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/**
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* @brief A layer for computing the dot product of two vectors.
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* Input1: vector (batchSize * dim)
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* Input2: vector (batchSize * dim)
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* Output: a matrix: (batchSize * 1)
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*/
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class DotProdLayer : public Layer {
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public:
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explicit DotProdLayer(const LayerConfig& config) : Layer(config) {}
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~DotProdLayer() {}
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bool init(const LayerMap& layerMap,
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const ParameterMap& parameterMap) override;
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void forward(PassType passType) override;
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void backward(const UpdateCallback& callback = nullptr) override;
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};
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REGISTER_LAYER(dot_prod, DotProdLayer);
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bool DotProdLayer::init(const LayerMap& layerMap,
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const ParameterMap& parameterMap) {
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Layer::init(layerMap, parameterMap);
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CHECK_EQ(inputLayers_.size(), 2U);
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CHECK_EQ(1UL, getSize())
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<< "The output dimensionality of this layer should be fixed to 1.";
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return true;
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}
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void DotProdLayer::forward(PassType passType) {
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Layer::forward(passType);
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MatrixPtr inV0 = getInputValue(0);
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MatrixPtr inV1 = getInputValue(1);
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size_t batchSize = inV0->getHeight();
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CHECK_EQ(inV1->getHeight(), batchSize);
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CHECK_EQ(inV0->getWidth(), inV1->getWidth());
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{
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REGISTER_TIMER_INFO("FwResetTimer", getName().c_str());
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reserveOutput(batchSize, 1);
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}
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MatrixPtr outV = getOutputValue();
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{
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REGISTER_TIMER_INFO("FwDotProdTimer", getName().c_str());
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outV->sumOfProducts(*inV0, *inV1, 1, 0);
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}
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}
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void DotProdLayer::backward(const UpdateCallback& callback) {
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MatrixPtr inV0 = getInputValue(0);
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MatrixPtr inV1 = getInputValue(1);
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MatrixPtr outG = getOutputGrad();
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MatrixPtr inG0 = getInputGrad(0);
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MatrixPtr inG1 = getInputGrad(1);
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{
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REGISTER_TIMER_INFO("BwDotProdTimer", getName().c_str());
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if (inG0) {
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inG0->addRowScale(0, *inV1, *outG);
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}
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if (inG1) {
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inG1->addRowScale(0, *inV0, *outG);
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}
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}
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}
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} // namespace paddle
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