121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoOneToOneBreeder.h
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// (c) Maarten Keijzer and Marc Schoenauer, 2001
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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: mkeijzer@dhi.dk
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Marc.Schoenauer@polytechnique.fr
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*/
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//-----------------------------------------------------------------------------
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#ifndef eoOneToOneBreeder_h
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#define eoOneToOneBreeder_h
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//-----------------------------------------------------------------------------
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#include <eoOp.h>
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#include <eoGenOp.h>
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#include <eoPopulator.h>
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#include <eoSelectOne.h>
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#include <eoSequentialSelect.h>
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#include <eoBreed.h>
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#include <eoEvalFunc.h>
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#include <eoPopulator.h>
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#include <utils/eoHowMany.h>
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/** eoOneToOneBreeder: transforms a population using
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* - an operator that MODIFIES only one parent from the populator
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* (though it can use any number aside) and thus generates ONE offspring)
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* - a local replacement between the parent and its offspring
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*
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* Typically, Differential Evolution (Storn and Price 94) and Deb et al's
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* G3 can be built on this
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*
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* @ingroup Combination
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*/
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template<class EOT>
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class eoOneToOneBreeder: public eoBreed<EOT>
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{
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public:
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/** Ctor:
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* @param _op a general operator (must MODIFY only ONE parent)
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* @param _eval an eoEvalFunc to evaluate the offspring
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* @param _pReplace probability that the best of parent/offspring wins [1]
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* @param _howMany eoHowMany offpsring to generate [100%]
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*/
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eoOneToOneBreeder(
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eoGenOp<EOT>& _op,
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eoEvalFunc<EOT> & _eval,
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double _pReplace = 1.0,
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eoHowMany _howMany = eoHowMany(1.0) ) :
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op(_op), eval(_eval), select( false ),
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pReplace(_pReplace), howMany(_howMany) {}
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/** The breeder: iteratively calls the genOp ONCE on a selective populator
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* after having recorded the parent
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* Then does the replacement
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*
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* @param _parents the initial population
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* @param _offspring the resulting population (content -if any- is lost)
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*/
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void operator()(const eoPop<EOT>& _parents, eoPop<EOT>& _offspring)
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{
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unsigned target = howMany(_parents.size());
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_offspring.clear();
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eoSelectivePopulator<EOT> popit(_parents, _offspring, select);
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for (unsigned iParent=0; iParent<target; iParent++)
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{
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unsigned pos = popit.tellp(); // remember current position
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EOT theParent = *popit; // remember the parent itself
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// now apply operator - will modify the parent
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op(popit);
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// replacement
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EOT & leOffspring = *popit;
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// check: only one offspring?
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unsigned posEnd = popit.tellp();
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if (posEnd != pos)
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throw std::runtime_error("Operator can only generate a SINGLE offspring in eoOneToOneBreeder");
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// do the tournament between parent and offspring
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eval(leOffspring); // first need to evaluate the offspring
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if (theParent > leOffspring) // old parent better than offspring
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if (rng.uniform() < pReplace) // if probability
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leOffspring = theParent; // replace
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// finally, go to next guy to handle
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++popit;
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}
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}
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/// The class name.
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virtual std::string className() const { return "eoOneToOneBreeder"; }
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private:
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eoGenOp<EOT>& op;
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eoEvalFunc<EOT> & eval;
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eoSequentialSelect<EOT> select;
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double pReplace;
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eoHowMany howMany;
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};
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#endif
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