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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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#pragma once
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#include "paddle/math/Vector.h"
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#include "paddle/utils/Common.h"
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namespace paddle {
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/**
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* Performs the following operations.
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*
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* momentumVec = momentum * momentumVec
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* - learningRate * grad
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* - learningRate * decayRate * value
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*
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* value = value + momentumVec
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* momentum = 0 or decayRate = 0 are specially handled to avoid unnecessary
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* computation.
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*/
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void sgdUpdate(real learningRate,
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real momentum,
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real decayRate,
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Vector* value,
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Vector* grad,
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Vector* momentumVec);
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void sgdUpdateCpu(real learningRate,
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real momentum,
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real decayRate,
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size_t size,
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real* value,
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const real* grad,
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real* momentumVec);
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void sgdUpdateAvx(float learningRate,
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float momentum,
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float decayRate,
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size_t size,
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float* value,
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const float* grad,
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float* momentumVec);
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} // namespace paddle
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