92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoOrderXover.h
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//-----------------------------------------------------------------------------
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#ifndef eoOrderXover_h
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#define eoOrderXover_h
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//-----------------------------------------------------------------------------
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#include <algorithm>
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#include <utils/eoRNG.h>
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#include <eoInit.h>
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/**
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* apply orderXover on two chromosomes.
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* Example:
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* With 2 parents p1= [1,2,4,3,6,5], p2= [4,5,3,1,6,2]
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* It applies a random cut between ("|") two indices. Example: the second element and the fourth:
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* p1 : [1|2,4,3|6,5] and p2 : [4|5,3,1|6,2] generate two children:
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* c1 = [2,4,3,6,5,1] 2,4,3 taken from p1 and 6,5,1 from p2
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* c2 = [5,3,1,6,2,4] 5,3,1 taken from p2 and 6,2,4 from p1
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*
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* @ingroup Variators
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*/
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template<class Chrom> class eoOrderXover: public eoQuadOp<Chrom>
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{
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public:
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/// The class name.
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virtual std::string className() const { return "eoOrderXover"; }
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/**
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* @return true if the chromosome has changed
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* @param _chrom1 The first chromosome which will be crossed with chrom2.
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* @param _chrom2 The second chromosome which will be crossed with chrom1.
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*/
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bool operator()(Chrom& _chrom1, Chrom& _chrom2){
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char direction=eo::rng.flip()? 1 : -1;
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unsigned cut2= 1 + eo::rng.random(_chrom1.size());
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unsigned cut1= eo::rng.random(cut2);
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Chrom tmp1= _chrom1;
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Chrom tmp2= _chrom2;
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cross(tmp1, tmp2, _chrom1, direction, cut1, cut2);
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cross(tmp2, tmp1, _chrom2, direction, cut1, cut2);
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_chrom1.invalidate();
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_chrom2.invalidate();
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return true;
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}
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private:
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/**
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* @param _chrom1 The first parent chromosome.
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* @param _chrom2 The second parent chromosome.
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* @param _child The result chromosome.
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* @param _direction The direction of the OrderXover (left: -1 or right: 1)
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* @param _cut1 index of the first cut
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* @param _cut2 index of the second cut
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*/
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void cross(Chrom& _chrom1, Chrom& _chrom2, Chrom& _child, char _direction, unsigned _cut1, unsigned _cut2){
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unsigned size, id=0, from=0;
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size= _chrom1.size();
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std::vector<bool> verif(size, false);
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for(unsigned i= _cut1; i<_cut2; i++){
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_child[id++]= _chrom1[i];
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verif[_chrom1[i] % size] = true;
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}
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while(_chrom2[from] != _child[_cut2 - 1])
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from++;
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for(unsigned i=0; i<size; i++){
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unsigned j= (_direction*i + from + size) % size;
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if(!verif[_chrom2[j] % size]){
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_child[id++]=_chrom2[j];
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verif[_chrom2[j]%size]=true;
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}
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}
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}
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};
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/** @example t-eoOrderXover.cpp
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*/
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#endif
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