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72 lines
2.1 KiB
72 lines
2.1 KiB
/* Copyright (c) 2016 Baidu, Inc. 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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#include "Layer.h"
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#include "BatchNormBaseLayer.h"
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namespace paddle {
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/**
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* @brief A Inheritance class of Batch normalization layer.
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* It supports both CPU and GPU.
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*
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* The config file api is batch_norm_layer.
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*/
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class BatchNormalizationLayer : public BatchNormBaseLayer {
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public:
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explicit BatchNormalizationLayer(const LayerConfig& config)
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: BatchNormBaseLayer(config), firstTest_(true) {}
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~BatchNormalizationLayer() {}
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bool init(const LayerMap& layerMap, const ParameterMap& parameterMap);
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void forward(PassType passType);
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void backward(const UpdateCallback& callback = nullptr);
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protected:
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/// Epsilon value used in the batch normalization formula.
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static const real EPS;
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/// Load pre-calculated mean and std.
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void setMeanAndStd();
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/// Calculate mean and std.
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void calMeanAndStd(const MatrixPtr& mat);
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/// Calculate moving mean and variance.
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void calMovingMeanAndVar();
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/// expand a Matrix from batch, channels* imagePixels to
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/// batch * ImagePixels * channels.
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void expandMat(const MatrixPtr& in, MatrixPtr& out);
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/// Shrink a Matrix from from batch * ImagePixels * channels
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/// to batch, channels* imagePixels.
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void shrinkMat(const MatrixPtr& in, MatrixPtr& out);
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MatrixPtr tmpMat_, tmpGrad_;
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MatrixPtr expandedIn_, expandedOut_;
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MatrixPtr expandedInGrad_, expandedOutGrad_, inGrad_;
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MatrixPtr normIn_, normInGrad_, meanGrad_, stdGrad_;
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/// Load mean and variance only once flag.
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bool firstTest_;
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};
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} // namespace paddle
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