a94380fadb
git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@877 331e1502-861f-0410-8da2-ba01fb791d7f
142 lines
4.7 KiB
C++
142 lines
4.7 KiB
C++
/*
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<moSteadyFitSolContinue.h>
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Copyright (C) DOLPHIN Project-Team, INRIA Futurs, 2006-2008
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(C) OPAC Team, LIFL, 2002-2008
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Sébastien Cahon, Jean-Charles Boisson (Jean-Charles.Boisson@lifl.fr)
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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 _moSteadyFitSolContinue_h
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#define _moSteadyFitSolContinue_h
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#include <moSolContinue.h>
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//! One possible stopping criterion for a solution-based heuristic.
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/*!
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The stop criterion corresponds to a maximum number of iterations without improvement (after a minimum number of iterations).
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*/
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template < class EOT >
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class moSteadyFitSolContinue:public moSolContinue < EOT >
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{
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public:
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//! Alias for the fitness.
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typedef typename EOT::Fitness Fitness;
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//! Basic constructor.
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/*!
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\param _maxNumberOfIterations The number of iterations to reach before looking for the fitness.
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\param _maxNumberOfIterationWithoutImprovement The number of iterations without fitness improvement to reach for stop.
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*/
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moSteadyFitSolContinue (unsigned int _maxNumberOfIterations, unsigned int _maxNumberOfIterationWithoutImprovement)
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: maxNumberOfIterations (_maxNumberOfIterations), maxNumberOfIterationsWithoutImprovement(_maxNumberOfIterationWithoutImprovement),
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maxNumberOfIterationsReached(false), firstFitnessSaved(true), counter(0)
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{}
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//! Function that activates the stopping criterion.
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/*!
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Indicates if the fitness has not been improved since a number of iterations (after a minimum of iterations).
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\param _solution the current solution.
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\return true or false.
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*/
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bool operator () (const EOT & _solution)
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{
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if (!maxNumberOfIterationsReached)
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{
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maxNumberOfIterationsReached=((++counter)==maxNumberOfIterations);
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if (maxNumberOfIterationsReached)
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{
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std::cout << "[moSteadyFitSolContinue.h]: Done the minimum number of iterations [" << counter << "]." << std::endl;
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}
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return true;
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}
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if (_solution.invalid())
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{
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return true;
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}
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if (firstFitnessSaved)
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{
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fitness=_solution.fitness();
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counter=0;
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firstFitnessSaved=false;
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return true;
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}
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counter++;
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if ( _solution.fitness() > fitness )
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{
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fitness=_solution.fitness();
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counter=0;
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}
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if (counter==maxNumberOfIterationsWithoutImprovement)
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{
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std::cout << "[moSteadyFitSolContinue.h]: Done [" << counter << "] iterations without improvement." << std::endl;
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}
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return counter!=maxNumberOfIterationsWithoutImprovement;
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}
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//! Procedure which allows to initialise the stuff needed.
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/*!
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It can be also used to reinitialize the counter all the needed things.
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*/
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void init ()
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{
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maxNumberOfIterationsReached=false;
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counter=0;
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firstFitnessSaved=true;
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}
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private:
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//! Maximum number of iterations before considering the fitness.
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unsigned int maxNumberOfIterations;
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//! Maximum number of iterations without improvement allowed.
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unsigned int maxNumberOfIterationsWithoutImprovement;
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//! Flag that indicates that the maxNumberIteration have been reached.
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bool maxNumberOfIterationsReached;
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//! Flag that this is the first time that the fitness is used.
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bool firstFitnessSaved;
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//! Current Fitness.
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Fitness fitness;
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//! The iteration couter.
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unsigned int counter;
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};
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#endif
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