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92 lines
2.7 KiB
92 lines
2.7 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 "L2DistanceLayer.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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REGISTER_LAYER(l2_distance, L2DistanceLayer);
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bool L2DistanceLayer::init(const LayerMap& layerMap,
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const ParameterMap& parameterMap) {
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/* Initialize the basic parent class */
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Layer::init(layerMap, parameterMap);
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CHECK_EQ(inputLayers_.size(), 2UL) << "The L2DistanceLayer accepts two and "
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<< "only two inputs.";
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CHECK_EQ(getSize(), 1UL) << "The output dimensionality of L2DistanceLayer "
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<< "is fixed to be 1.";
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return true;
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}
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void L2DistanceLayer::forward(PassType passType) {
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Layer::forward(passType);
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const auto inV1 = getInputValue(0);
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const auto inV2 = getInputValue(1);
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CHECK(inV1 && inV2);
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CHECK_EQ(inV1->getHeight(), inV2->getHeight())
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<< "The height of two inputs of this layer must be the same.";
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CHECK_EQ(inV1->getWidth(), inV2->getWidth())
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<< "The width of two inputs of this layer must be the same.";
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int batchSize = inV1->getHeight();
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int output_dim = getSize();
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{
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REGISTER_TIMER_INFO("L2DistanceBpAtvTimer", getName().c_str());
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reserveOutput(batchSize, output_dim);
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auto outV = getOutputValue();
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CHECK(outV) << "The output matrix should not be null.";
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Matrix::resizeOrCreate(
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inputSub_, inV1->getHeight(), inV1->getWidth(), false, useGpu_);
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inputSub_->assign(*inV1);
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inputSub_->sub(*inV2);
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outV->sumOfProducts(*inputSub_, *inputSub_, 1, 0);
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outV->sqrt2(*outV);
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}
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}
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void L2DistanceLayer::backward(const UpdateCallback& callback) {
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const auto outG = getOutputGrad();
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const auto outV = getOutputValue();
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CHECK(outG && outV);
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auto inGrad1 = getInputGrad(0);
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auto inGrad2 = getInputGrad(1);
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{
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REGISTER_TIMER_INFO("L2DistanceBpAtvTimer", getName().c_str());
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if (inGrad1 || inGrad2) {
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outV->scalarDiv(*outV, 1.);
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outV->dotMul(*outG, *outV);
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}
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if (inGrad1) inGrad1->addRowScale(0, *inputSub_, *outV);
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if (inGrad2) {
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inputSub_->mulScalar(-1.);
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inGrad2->addRowScale(0, *inputSub_, *outV);
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}
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}
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}
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} // namespace paddle
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