142 lines
4.3 KiB
C++
142 lines
4.3 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoRandomSelect.h
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// (c) GeNeura Team, 1998 - EEAAX 1999, Maarten Keijzer 2000
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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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Marc.Schoenauer@polytechnique.fr
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mak@dhi.dk
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*/
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//-----------------------------------------------------------------------------
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#ifndef eoRandomSelect_h
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#define eoRandomSelect_h
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//-----------------------------------------------------------------------------
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/** This file contains straightforward selectors:
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* eoRandomSelect returns an individual uniformly selected
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* eoBestSelect always return the best individual
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* eoSequentialSelect returns all individuals in turn
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*/
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#include <utils/eoRNG.h>
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#include <eoSelectOne.h>
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//-----------------------------------------------------------------------------
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/** eoRandomSelect: a selection method that selects ONE individual randomly */
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//-----------------------------------------------------------------------------
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template <class EOT> class eoRandomSelect: public eoSelectOne<EOT>
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{
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public:
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/// not a big deal!!!
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virtual const EOT& operator()(const eoPop<EOT>& _pop)
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{
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return _pop[eo::rng.random(_pop.size())] ;
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}
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};
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//-----------------------------------------------------------------------------
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/** eoBestSelect: a selection method that always return the best
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* (mainly for testing purposes) */
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//-----------------------------------------------------------------------------
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template <class EOT> class eoBestSelect: public eoSelectOne<EOT>
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{
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public:
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/// not a big deal!!!
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virtual const EOT& operator()(const eoPop<EOT>& _pop)
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{
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return _pop.best_element() ;
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}
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};
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//-----------------------------------------------------------------------------
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/** eoSequentialSelect: returns all individual in order
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* looping back to the beginning when exhasuted
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* can be from best to worse, or in random order
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*
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* It is the eoSelectOne equivalent of eoDetSelect -
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* though eoDetSelect always returns individuals from best to worst
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*/
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//-----------------------------------------------------------------------------
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template <class EOT> class eoSequentialSelect: public eoSelectOne<EOT>
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{
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public:
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/** Ctor: sets the current pter to MAXINT so init will take place first time
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not very elegant, maybe ...
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*/
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eoSequentialSelect(bool _ordered = true):
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ordered(_ordered), current(MAXINT) {}
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void setup(const eoPop<EOT>& _pop)
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{
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eoPters.resize(_pop.size());
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if (ordered) // probably we could have a marker to avoid re-sorting
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_pop.sort(eoPters);
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else
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_pop.shuffle(eoPters);
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current=0;
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}
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virtual const EOT& operator()(const eoPop<EOT>& _pop)
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{
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if (current >= _pop.size())
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setup(_pop);
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unsigned eoN = current;
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current++;
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return *eoPters[eoN] ;
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}
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private:
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bool ordered;
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unsigned current;
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vector<const EOT*> eoPters;
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};
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//-----------------------------------------------------------------------------
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/** eoNoSelect: returns all individual in order WITHOUT USING FITNESS!!!
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* looping back to the beginning when exhasuted
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*
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*/
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//-----------------------------------------------------------------------------
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template <class EOT> class eoNoSelect: public eoSelectOne<EOT>
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{
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public:
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/** Ctor
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*/
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eoNoSelect(): current(0) {}
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virtual const EOT& operator()(const eoPop<EOT>& _pop)
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{
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if (current >= _pop.size())
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current=0;
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current++;
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return _pop[current-1] ;
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}
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private:
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unsigned current;
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};
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#endif
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