80 lines
2.2 KiB
C++
80 lines
2.2 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
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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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#include <algorithm>
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#include <numeric> // for accumulate
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#include <functional>
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#include <eoPopOps.h>
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#include <eoUniform.h>
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//-----------------------------------------------------------------------------
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/**
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* eoRandomSelect: an selection operator, which selects randomly a percentage
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of the initial population.
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*/
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template<class EOT> class eoRandomSelect: public eoSelect<EOT>
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{
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public:
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///
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eoRandomSelect(const float& _percent = 0.4): eoSelect<EOT>(), rate(_percent) {};
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///
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virtual ~eoRandomSelect() {};
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/// Takes a percentage of the population randomly, and transfers it to siblings
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virtual void operator() ( const eoPop<EOT>& _parents, eoPop<EOT>& _siblings ) const {
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// generates random numbers
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eoUniform<unsigned> uniform(0, _parents.size()-1);
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unsigned num_chroms = (unsigned)(rate * _parents.size());
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// selection of chromosomes
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do {
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_siblings.push_back(_parents[uniform()]);
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} while (_siblings.size() < num_chroms);
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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 >> rate;
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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´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 << rate;
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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 "eoRandomSelect";};
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//@}
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private:
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float rate;
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};
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//-----------------------------------------------------------------------------
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#endif EOGSRANDOMSELECT_H
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