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