53 lines
1.5 KiB
53 lines
1.5 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
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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 "paddle/math/Matrix.h"
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namespace paddle {
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/**
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* @brief The layer calculates the l2 distance between two input vectors.
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* \f[
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* f(\bf{x}, \bf{y}) = \sqrt{\sum_{i=1}^D(x_i - y_i)}
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* \f]
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*
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* - Input1: A vector (batchSize * dataDim)
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* - Input2: A vector (batchSize * dataDim)
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* - Output: A vector (batchSize * 1)
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*
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* The configuration api is: l2_distance_layer.
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*/
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class L2DistanceLayer : public Layer {
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public:
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explicit L2DistanceLayer(const LayerConfig& config) : Layer(config) {}
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~L2DistanceLayer() {}
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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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private:
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// Store the result of subtracting Input2 from Input1 in forward computation,
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// which will be reused in backward computation.
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MatrixPtr inputSub_;
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};
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} // namespace paddle
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