156 lines
6.5 KiB
C++
156 lines
6.5 KiB
C++
/*
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* <moeoElitistReplacement.h>
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* Copyright (C) DOLPHIN Project-Team, INRIA Futurs, 2006-2007
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* (C) OPAC Team, LIFL, 2002-2007
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*
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* Arnaud Liefooghe
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*
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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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*
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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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*
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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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*
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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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*/
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//-----------------------------------------------------------------------------
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#ifndef MOEOELITISTREPLACEMENT_H_
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#define MOEOELITISTREPLACEMENT_H_
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#include <comparator/moeoComparator.h>
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#include <comparator/moeoFitnessThenDiversityComparator.h>
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#include <diversity/moeoDiversityAssignment.h>
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#include <diversity/moeoDummyDiversityAssignment.h>
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#include <fitness/moeoFitnessAssignment.h>
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#include <replacement/moeoReplacement.h>
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/**
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* Elitist replacement strategy that consists in keeping the N best individuals.
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*/
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template < class MOEOT > class moeoElitistReplacement:public moeoReplacement < MOEOT >
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{
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public:
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/**
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* Full constructor.
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* @param _fitnessAssignment the fitness assignment strategy
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* @param _diversityAssignment the diversity assignment strategy
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* @param _comparator the comparator (used to compare 2 individuals)
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*/
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moeoElitistReplacement (moeoFitnessAssignment < MOEOT > & _fitnessAssignment, moeoDiversityAssignment < MOEOT > & _diversityAssignment, moeoComparator < MOEOT > & _comparator) :
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fitnessAssignment (_fitnessAssignment), diversityAssignment (_diversityAssignment), comparator (_comparator)
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{}
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/**
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* Constructor without comparator. A moeoFitThenDivComparator is used as default.
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* @param _fitnessAssignment the fitness assignment strategy
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* @param _diversityAssignment the diversity assignment strategy
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*/
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moeoElitistReplacement (moeoFitnessAssignment < MOEOT > & _fitnessAssignment, moeoDiversityAssignment < MOEOT > & _diversityAssignment) :
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fitnessAssignment (_fitnessAssignment), diversityAssignment (_diversityAssignment), comparator (defaultComparator)
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{}
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/**
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* Constructor without moeoDiversityAssignement. A dummy diversity is used as default.
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* @param _fitnessAssignment the fitness assignment strategy
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* @param _comparator the comparator (used to compare 2 individuals)
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*/
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moeoElitistReplacement (moeoFitnessAssignment < MOEOT > & _fitnessAssignment, moeoComparator < MOEOT > & _comparator) :
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fitnessAssignment (_fitnessAssignment), diversityAssignment (defaultDiversity), comparator (_comparator)
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{}
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/**
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* Constructor without moeoDiversityAssignement nor moeoComparator.
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* A moeoFitThenDivComparator and a dummy diversity are used as default.
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* @param _fitnessAssignment the fitness assignment strategy
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*/
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moeoElitistReplacement (moeoFitnessAssignment < MOEOT > & _fitnessAssignment) :
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fitnessAssignment (_fitnessAssignment), diversityAssignment (defaultDiversity), comparator (defaultComparator)
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{}
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/**
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* Replaces the first population by adding the individuals of the second one, sorting with a moeoComparator and resizing the whole population obtained.
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* @param _parents the population composed of the parents (the population you want to replace)
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* @param _offspring the offspring population
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*/
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void operator () (eoPop < MOEOT > &_parents, eoPop < MOEOT > &_offspring)
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{
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unsigned int sz = _parents.size ();
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// merges offspring and parents into a global population
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_parents.reserve (_parents.size () + _offspring.size ());
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std::copy (_offspring.begin (), _offspring.end (), back_inserter (_parents));
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// evaluates the fitness and the diversity of this global population
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fitnessAssignment (_parents);
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diversityAssignment (_parents);
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// sorts the whole population according to the comparator
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std::sort(_parents.begin(), _parents.end(), comparator);
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// finally, resize this global population
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_parents.resize (sz);
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// and clear the offspring population
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_offspring.clear ();
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}
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protected:
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/** the fitness assignment strategy */
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moeoFitnessAssignment < MOEOT > & fitnessAssignment;
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/** the diversity assignment strategy */
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moeoDiversityAssignment < MOEOT > & diversityAssignment;
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/** a dummy diversity assignment can be used as default */
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moeoDummyDiversityAssignment < MOEOT > defaultDiversity;
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/** a fitness then diversity comparator can be used as default */
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moeoFitnessThenDiversityComparator < MOEOT > defaultComparator;
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/** this object is used to compare solutions in order to sort the population */
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class Cmp
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{
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public:
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/**
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* Ctor.
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* @param _comp the comparator
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*/
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Cmp(moeoComparator < MOEOT > & _comp) : comp(_comp)
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{}
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/**
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* Returns true if _moeo1 is greater than _moeo2 according to the comparator
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* _moeo1 the first individual
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* _moeo2 the first individual
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*/
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bool operator()(const MOEOT & _moeo1, const MOEOT & _moeo2)
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{
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return comp(_moeo2,_moeo1);
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}
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private:
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/** the comparator */
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moeoComparator < MOEOT > & comp;
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}
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comparator;
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};
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#endif /*MOEOELITISTREPLACEMENT_H_ */
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