157 lines
3.7 KiB
C++
157 lines
3.7 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoTournament.h
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// (c) GeNeura Team, 1998
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/*
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Contact: todos@geneura.ugr.es, http://geneura.ugr.es
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*/
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//-----------------------------------------------------------------------------
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#ifndef _EOGSTOURN_H
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#define _EOGSTOURN_H
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//-----------------------------------------------------------------------------
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#include <utils/eoRNG.h>
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#include <eoPopOps.h>
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//-----------------------------------------------------------------------------
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/** Selects those who are going to reproduce using Tournament selection:
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a subset of the population of size tournamentSize is chosen,
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and the best is selected for the new population .
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@author JJ Merelo, 1998
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*/
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template<class EOT>
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class eoTournament:public eoBinPopOp<EOT>{
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public:
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/// Proportion of guys that are going to be eliminated
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eoTournament( float _perc, unsigned _tSize):
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eoBinPopOp<EOT>(), perc( _perc), repTournamentSize(_tSize){};
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/// Virtual dtor
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~eoTournament(){};
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/// Set tourn size
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void tournamentSize( unsigned _size ) { repTournamentSize = _size; };
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/**
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* Selects from the initial pop using tournament selection, and copies it
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* to the other population.
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*/
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virtual void operator() ( eoPop<EOT>& _vEO, eoPop<EOT>& _aVEO) {
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unsigned thisSize = _vEO.size();
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// Build vector
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for ( unsigned j = 0; j < thisSize*perc; j ++ ) {
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// Randomly select a tournamentSize set, and choose the best
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eoPop<EOT> veoTournament;
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for ( unsigned k = 0; k < repTournamentSize; k++ ) {
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unsigned chosen = rng.random(thisSize);
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EOT newEO = _vEO[chosen];
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veoTournament.push_back( newEO );
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}
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eoPop<EOT>::const_iterator best = max_element(veoTournament.begin(),
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veoTournament.end());
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if (best == veoTournament.end()) {
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throw runtime_error("error in void eoTournament::operator(eoPop<EOT>&, eoPop<EOT>&)");
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}
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// The best individual is chosen for the new population
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_aVEO.push_back( *best );
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}
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};
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/// @name Methods from eoObject
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//@{
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/**
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* Read object. Reads the percentage
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* Should call base class, just in case.
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* @param _s A istream.
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*/
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virtual void readFrom(istream& _s) {
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_s >> perc >> repTournamentSize;
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}
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/** Print itself: inherited from eoObject implementation. Declared virtual so that
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it can be reimplemented anywhere. Instance from base classes are processed in
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base classes, so you don<6F>t have to worry about, for instance, fitness.
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@param _s the ostream in which things are written*/
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virtual void printOn( ostream& _s ) const{
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_s << perc << endl << repTournamentSize << endl;
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}
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/** Inherited from eoObject
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@see eoObject
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*/
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string className() const {return "eoTournament";};
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//@}
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private:
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float perc;
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unsigned repTournamentSize;
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};
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#endif
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