75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/* -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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-----------------------------------------------------------------------------
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eoStochTournamentInserter.h
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Concrete steady state inserter. It is initialized with a population and
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inserts individuals in the population based on an inverse stochastic
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tournament
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(c) Maarten Keijzer (mkeijzer@mad.scientist.com) and GeNeura Team, 1999, 2000
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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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#ifndef eoStochTournamentInserter_h
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#define eoStochTournamentInserter_h
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#include <eoSteadyStateInserter.h>
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#include <utils/selectors.h>
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/**
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\ingroup inserters
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* eoStochTournamentInserter: Uses an inverse stochastic tournament to figure
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* out who gets overridden by the new individual. It resets the fitness of the
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* individual.
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*/
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template <class EOT>
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class eoStochTournamentInserter : public eoSteadyStateInserter<EOT>
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{
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public :
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eoStochTournamentInserter(eoEvalFunc<EOT>& _eval, double _t_rate):
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eoSteadyStateInserter<EOT>(_eval), t_rate(_t_rate)
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{
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if (t_rate < 0.5)
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{ // warning, error?
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t_rate = 0.55;
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}
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if (t_rate >= 1.0)
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{
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t_rate = 0.99; // 1.0 would mean deterministic tournament
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}
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}
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eoInserter<EOT>& operator()(const EOT& _eot)
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{
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EOT& eo = inverse_stochastic_tournament<EOT>(pop(), t_rate);
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eo = _eot; // overwrite loser of tournament
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eo.invalidate();
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return *this;
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}
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string className(void) const { return "eoStochTournamentInserter"; }
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private :
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double t_rate;
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};
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#endif
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