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79 lines
2.3 KiB
79 lines
2.3 KiB
8 years ago
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/* 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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namespace paddle {
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/**
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* A layer for clipping the input value by the threshold.
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* \f[
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* out[i] = \min\left(\max\left(in[i],p_{1}\right),p_{2}\right)
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* \f]
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*/
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class ClipLayer : public Layer {
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protected:
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real clipThresholdLow_;
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real clipThresholdHigh_;
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public:
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explicit ClipLayer(const LayerConfig& config) : Layer(config) {}
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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(clip, ClipLayer);
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bool ClipLayer::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(), 1U);
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auto layerConf = config_.inputs(0).clip_conf();
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clipThresholdLow_ = layerConf.clip_threshold_low();
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clipThresholdHigh_ = layerConf.clip_threshold_high();
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CHECK_LT(clipThresholdLow_, clipThresholdHigh_);
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return true;
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}
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void ClipLayer::forward(PassType passType) {
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Layer::forward(passType);
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MatrixPtr inV = getInputValue(0);
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resetOutput(inV->getHeight(), inV->getWidth());
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MatrixPtr outV = getOutputValue();
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outV->copyFrom(*inV);
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outV->clip(clipThresholdLow_, clipThresholdHigh_);
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}
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void ClipLayer::backward(const UpdateCallback& callback) {
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MatrixPtr inV = getInputValue(0);
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MatrixPtr inG = getInputGrad(0);
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MatrixPtr outV = getOutputValue();
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MatrixPtr outG = getOutputGrad();
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MatrixPtr tmpMtx;
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Matrix::resizeOrCreate(
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tmpMtx, outG->getHeight(), outG->getWidth(), false, useGpu_);
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tmpMtx->clipDerivative(*inV, clipThresholdLow_, clipThresholdHigh_);
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inG->addDotMul(*outG, *tmpMtx, 1, 1);
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}
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} // namespace paddle
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