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SOM
SOM
LearningRestraintFunc.h
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/*
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* Copyright (C) 2012-2020 Euclid Science Ground Segment
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*
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* This library is free software; you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3.0 of the License, or (at your option)
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* any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* @file LearningRestraintFunc.h
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* @author nikoapos
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*/
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#ifndef SOM_LEARNINGRESTRAINTFUNC_H
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#define SOM_LEARNINGRESTRAINTFUNC_H
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#include <cmath>
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#include <functional>
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namespace
Euclid
{
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namespace
SOM {
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namespace
LearningRestraintFunc {
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using
Signature
=
std::function<double(std::size_t iteration, std::size_t total_iterations)>
;
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Signature
linear
() {
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return
[](
std::size_t
iteration,
std::size_t
total_iterations) ->
double
{
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return
1.0 * (total_iterations - iteration) / total_iterations;
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};
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}
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Signature
exponentialDecay
(
double
initial_rate) {
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return
[initial_rate](
std::size_t
iteration,
std::size_t
total_iterations) ->
double
{
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return
initial_rate *
std::exp
(-1. * iteration / total_iterations);
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};
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}
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}
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}
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}
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#endif
/* SOM_LEARNINGRESTRAINTFUNC_H */
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std::function< double(std::size_t iteration, std::size_t total_iterations)>
std::exp
T exp(T... args)
Euclid::SOM::LearningRestraintFunc::exponentialDecay
Signature exponentialDecay(double initial_rate)
Definition:
LearningRestraintFunc.h:42
std::size_t
Euclid
Definition:
InstOrRefHolder.h:29
Euclid::SOM::LearningRestraintFunc::linear
Signature linear()
Definition:
LearningRestraintFunc.h:36
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