5df71ee73a
git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@267 331e1502-861f-0410-8da2-ba01fb791d7f
137 lines
4.9 KiB
C++
137 lines
4.9 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// moeoElitistReplacement.h
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// (c) OPAC Team (LIFL), Dolphin Project (INRIA), 2007
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/*
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This library...
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Contact: paradiseo-help@lists.gforge.inria.fr, http://paradiseo.gforge.inria.fr
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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 <moeoReplacement.h>
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#include <moeoComparator.h>
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#include <moeoFitnessAssignment.h>
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#include <moeoDiversityAssignment.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 _evalFitness the fitness assignment strategy
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* @param _evalDiversity 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 > & _evalFitness, moeoDiversityAssignment < MOEOT > & _evalDiversity, moeoComparator < MOEOT > & _comparator) :
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evalFitness (_evalFitness), evalDiversity (_evalDiversity), 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 _evalFitness the fitness assignment strategy
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* @param _evalDiversity the diversity assignment strategy
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*/
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moeoElitistReplacement (moeoFitnessAssignment < MOEOT > & _evalFitness, moeoDiversityAssignment < MOEOT > & _evalDiversity) :
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evalFitness (_evalFitness), evalDiversity (_evalDiversity), comparator (*(new moeoFitnessThenDiversityComparator < MOEOT >))
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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 _evalFitness 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 > & _evalFitness, moeoComparator < MOEOT > & _comparator) :
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evalFitness (_evalFitness), evalDiversity (*(new moeoDummyDiversityAssignment < MOEOT >)), 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 _evalFitness the fitness assignment strategy
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*/
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moeoElitistReplacement (moeoFitnessAssignment < MOEOT > & _evalFitness) :
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evalFitness (_evalFitness), evalDiversity (*(new moeoDummyDiversityAssignment < MOEOT >)), comparator (*(new moeoFitnessThenDiversityComparator < MOEOT >))
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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 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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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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evalFitness (_parents);
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evalDiversity (_parents);
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// sorts the whole population according to the comparator
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Cmp cmp(comparator);
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std::sort(_parents.begin(), _parents.end(), cmp);
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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 > & evalFitness;
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/** the diversity assignment strategy */
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moeoDiversityAssignment < MOEOT > & evalDiversity;
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/** the comparator (used to compare 2 individuals) */
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moeoComparator < MOEOT > & comparator;
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/**
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* This class is used to compare solutions in order to sort the population.
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*/
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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 _comparator the comparator
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*/
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Cmp(moeoComparator < MOEOT > & _comparator) : comparator(_comparator)
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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 comparator(_moeo1,_moeo2);
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}
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private:
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/** the comparator */
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moeoComparator < MOEOT > & comparator;
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};
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};
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#endif /*MOEOELITISTREPLACEMENT_H_ */
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