107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
/*
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<moSimpleCoolingSchedule.h>
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Copyright (C) DOLPHIN Project-Team, INRIA Lille - Nord Europe, 2006-2010
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Sébastien Verel, Arnaud Liefooghe, Jérémie Humeau
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This software is governed by the CeCILL license under French law and
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abiding by the rules of distribution of free software. You can use,
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modify and/ or redistribute the software under the terms of the CeCILL
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license as circulated by CEA, CNRS and INRIA at the following URL
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"http://www.cecill.info".
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As a counterpart to the access to the source code and rights to copy,
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modify and redistribute granted by the license, users are provided only
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with a limited warranty and the software's author, the holder of the
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economic rights, and the successive licensors have only limited liability.
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In this respect, the user's attention is drawn to the risks associated
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with loading, using, modifying and/or developing or reproducing the
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software by the user in light of its specific status of free software,
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that may mean that it is complicated to manipulate, and that also
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therefore means that it is reserved for developers and experienced
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professionals having in-depth computer knowledge. Users are therefore
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encouraged to load and test the software's suitability as regards their
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requirements in conditions enabling the security of their systems and/or
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data to be ensured and, more generally, to use and operate it in the
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same conditions as regards security.
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The fact that you are presently reading this means that you have had
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knowledge of the CeCILL license and that you accept its terms.
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ParadisEO WebSite : http://paradiseo.gforge.inria.fr
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Contact: paradiseo-help@lists.gforge.inria.fr
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*/
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#ifndef _moSimpleCoolingSchedule_h
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#define _moSimpleCoolingSchedule_h
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#include <coolingSchedule/moCoolingSchedule.h>
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/**
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* Classical cooling Schedule of the temperature in the simulated algorithm with initial and final temperature and a factor of decrease
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*
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*/
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template< class EOT >
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class moSimpleCoolingSchedule : public moCoolingSchedule<EOT>
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{
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public:
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/**
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* Constructor
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* @param _initT initial temperature
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* @param _alpha factor of decreasing
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* @param _span number of iteration with equal temperature
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* @param _finalT final temperature, threshold of the stopping criteria
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*/
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moSimpleCoolingSchedule(double _initT, double _alpha, unsigned _span, double _finalT)
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: initT(_initT), alpha(_alpha), span(_span), finalT(_finalT) {}
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/**
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* Getter on the initial temperature
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* @param _solution initial solution
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* @return the initial temperature
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*/
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virtual double init(EOT & _solution) {
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// number of iteration with the same temperature
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step = 0;
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return initT;
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}
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/**
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* update the temperature by a factor
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* @param _temp current temperature to update
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* @param _acceptedMove true when the move is accepted, false otherwise
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* @param _currentSolution the current solution
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*/
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virtual void update(double& _temp, bool _acceptedMove, EOT & _currentSolution) {
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if (step >= span) {
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_temp *= alpha;
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step = 0;
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} else
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step++;
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}
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/**
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* compare the temperature to the threshold
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* @param _temp current temperature
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* @return true if the current temperature is over the threshold (final temperature)
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*/
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virtual bool operator()(double _temp) {
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return _temp > finalT;
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}
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private:
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// initial temperature
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double initT;
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// coefficient of decrease
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double alpha;
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// maximum number of iterations at the same temperature
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unsigned int span;
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// threshold temperature
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double finalT;
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// number of steps with the same temperature
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unsigned int step;
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};
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#endif
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