49 lines
1.4 KiB
49 lines
1.4 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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#pragma once
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#include "Layer.h"
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#include "paddle/math/Matrix.h"
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#include "paddle/utils/ThreadLocal.h"
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namespace paddle {
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/**
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* @brief A layer for calculating cosine similarity between two vector
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* \f[
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* f(x,y)=scale\frac{x_1y_1+x_2y_2+...+x_ny_n}{\sqrt{x_1^2+x_2^2+...
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* +x_n^2}\sqrt{y_1^2+y_2^2+...+y_n^2}}
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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) or (1 * dataDim) *
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* - Output: A vector (batchSize * 1)
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*
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* The config file api is cos_sim.
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*/
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class CosSimLayer : public Layer {
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public:
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explicit CosSimLayer(const LayerConfig& config) : Layer(config) {}
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~CosSimLayer() {}
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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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} // namespace paddle
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