357 lines
8.2 KiB
C++
357 lines
8.2 KiB
C++
//-----------------------------------------------------------------------------
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// eoBitOp.h
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//-----------------------------------------------------------------------------
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#ifndef eoBitOp_h
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#define eoBitOp_h
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//-----------------------------------------------------------------------------
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#include <algorithm> // swap_ranges
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#include <eoUniform.h> // eoUniform
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#include <eoBin.h> // eoBin
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#include <eoOp.h> // eoMonOp
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/** @name BitWise Genetic operators
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Even as these operators might seem general, they are particular versions of genetic
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operators useful only for binary operators. As any set of genetic operators, it must
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have a factory that knows how to build them from a description
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@author GeNeura Team
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@version 0.1
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@see eoBin
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@see eoBitOpFactory
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*/
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//@{
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/** eoBinRandom --> mofify a chromosome in a random way */
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template<class Chrom> class eoBinRandom: public eoMonOp<Chrom>
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{
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public:
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/// The class name.
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string className() const { return "eoBinRandom"; }
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/**
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* Randomizes a cromosome.
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* @param chrom The cromosome to be randomize.
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*/
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void operator()(Chrom& chrom) const
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{
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eoUniform<float> uniform(0.0, 1.0);
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for (unsigned i = 0; i < chrom.size(); i++)
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chrom[i] = (uniform() < 0.5) ? false : true;
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}
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};
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/** eoBinBitFlip --> chages a bit */
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template<class Chrom> class eoBinBitFlip: public eoMonOp<Chrom>
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{
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public:
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/// The class name.
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string className() const { return "eoBinBitFlip"; }
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/**
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* Change one bit.
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* @param chrom The cromosome which one bit is going to be changed.
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*/
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void operator()(Chrom& chrom) const
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{
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eoUniform<int> uniform(0, chrom.size());
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unsigned i = uniform();
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chrom[i] = (chrom[i]) ? false : true;
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}
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};
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/** eoBinMutation --> classical mutation */
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template<class Chrom> class eoBinMutation: public eoMonOp<Chrom>
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{
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public:
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/**
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* (Default) Constructor.
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* @param _rate Rate of mutation.
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*/
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eoBinMutation(const double& _rate = 0.01): rate(_rate), uniform(0.0, 1.0) {}
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/// The class name.
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string className() const { return "eoBinMutation"; }
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/**
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* Mutate a chromosome.
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* @param chrom The chromosome to be mutated.
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*/
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void operator()(Chrom& chrom) const
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{
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for (unsigned i = 0; i < chrom.size(); i++)
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if (uniform() < rate)
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chrom[i] = !chrom[i];
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}
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private:
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double rate;
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mutable eoUniform<float> uniform;
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};
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/** eoBinInversion: inverts the bits of the chromosome between an interval */
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template<class Chrom> class eoBinInversion: public eoMonOp<Chrom>
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{
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public:
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/// The class name.
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string className() const { return "eoBinInversion"; }
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/**
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* Inverts a range of bits in a binary chromosome.
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* @param chrom The chromosome whos bits are going to be inverted (a range).
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*/
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void operator()(Chrom& chrom) const
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{
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eoUniform<unsigned> uniform(0, chrom.size() + 1);
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unsigned u1 = uniform(), u2;
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do u2 = uniform(); while (u1 == u2);
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unsigned r1 = min(u1, u2), r2 = max(u1, u2);
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reverse(chrom.begin() + r1, chrom.begin() + r2);
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}
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};
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/** eoBinNext --> next binary value */
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template<class Chrom> class eoBinNext: public eoMonOp<Chrom>
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{
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public:
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/// The class name.
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string className() const { return "eoBinNext"; }
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/**
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* Change the bit string x to be x+1.
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* @param chrom The chromosome to be added one.
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*/
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void operator()(Chrom& chrom) const
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{
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for (int i = chrom.size() - 1; i >= 0; i--)
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if (chrom[i])
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{
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chrom[i] = 0;
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continue;
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}
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else
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{
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chrom[i] = 1;
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break;
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}
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}
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};
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/** eoBinPrev --> previos binary value */
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template<class Chrom> class eoBinPrev: public eoMonOp<Chrom>
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{
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public:
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/// The class name.
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string className() const { return "eoBinPrev"; }
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/**
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* Change the bit string x to be x-1.
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* @param chrom The chromosome to be substracted one.
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*/
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void operator()(Chrom& chrom) const
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{
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for (int i = chrom.size() - 1; i >= 0; i--)
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if (chrom[i])
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{
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chrom[i] = 0;
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break;
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}
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else
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{
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chrom[i] = 1;
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continue;
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}
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}
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};
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/** eoBinCrossover --> classic crossover */
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template<class Chrom> class eoBinCrossover: public eoBinOp<Chrom>
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{
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public:
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/// The class name.
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string className() const { return "eoBinCrossover"; }
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/**
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* 2-point crossover for binary chromosomes.
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* @param chrom1 The first chromosome.
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* @param chrom2 The first chromosome.
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*/
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void operator()(Chrom& chrom1, Chrom& chrom2) const
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{
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eoUniform<unsigned> uniform(1, min(chrom1.size(), chrom2.size()));
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swap_ranges(chrom1.begin(), chrom1.begin() + uniform(), chrom2.begin());
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}
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};
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/** eoBinNxOver --> n-point crossover */
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template<class Chrom> class eoBinNxOver: public eoBinOp<Chrom>
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{
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public:
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/// (Defualt) Constructor.
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eoBinNxOver(const unsigned& _num_points = 2): num_points(_num_points)
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{
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if (num_points < 1)
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runtime_error("NxOver --> invalid number of points");
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}
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/// The class name.
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string className() const { return "eoBinNxOver"; }
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/**
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* n-point crossover for binary chromosomes.
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* @param chrom1 The first chromosome.
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* @param chrom2 The first chromosome.
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*/
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void operator()(Chrom& chrom1, Chrom& chrom2) const
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{
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unsigned max_size = min(chrom1.size(), chrom2.size());
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unsigned max_points = min(max_size - 1, num_points);
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vector<bool> points(max_size, false);
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eoUniform<unsigned> uniform(1, max_size);
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// select ranges of bits to swap
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do {
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unsigned bit = uniform();
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if (points[bit])
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continue;
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else
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{
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points[bit] = true;
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max_points--;
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}
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} while (max_points);
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// swap bits between chromosomes
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bool change = false;
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for (unsigned bit = 1; bit < points.size(); bit++)
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{
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if (points[bit])
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change = !change;
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if (change)
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swap(chrom1[bit], chrom2[bit]);
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}
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}
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private:
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unsigned num_points;
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};
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/** eoBinGxOver --> gene crossover */
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template<class Chrom> class eoBinGxOver: public eoBinOp<Chrom>
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{
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public:
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/// Constructor.
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eoBinGxOver(const unsigned _gene_size, const unsigned _num_points = 2):
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gene_size(_gene_size), num_points(_num_points)
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{
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if (gene_size < 1)
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runtime_error("GxOver --> invalid gene size");
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if (num_points < 1)
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runtime_error("GxOver --> invalid number of points");
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}
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/// The class name
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string className() const { return "eoBinGxOver"; }
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/**
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* Gene crossover for binary chromosomes.
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* @param chrom1 The first chromosome.
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* @param chrom2 The first chromosome.
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*/
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void operator()(Chrom& chrom1, Chrom& chrom2) const
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{
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unsigned max_genes = min(chrom1.size(), chrom2.size()) / gene_size;
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unsigned cut_genes = min(max_genes, num_points);
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vector<bool> points(max_genes, false);
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eoUniform<unsigned> uniform(0, max_genes);
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// selects genes to swap
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do {
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unsigned bit = uniform();
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if (points[bit])
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continue;
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else
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{
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points[bit] = true;
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cut_genes--;
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}
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} while (cut_genes);
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// swaps genes
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for (unsigned i = 0; i < points.size(); i++)
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if (points[i])
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swap_ranges(chrom1.begin() + i * gene_size,
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chrom1.begin() + i * gene_size + gene_size,
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chrom2.begin() + i * gene_size);
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}
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private:
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unsigned gene_size;
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unsigned num_points;
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};
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/** eoBinUxOver --> uniform crossover */
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template<class Chrom> class eoBinUxOver: public eoBinOp<Chrom>
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{
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public:
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/// (Default) Constructor.
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eoBinUxOver(const float _rate = 0.5): rate(_rate)
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{
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if (rate < 0 || rate > 1)
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runtime_error("UxOver --> invalid rate");
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}
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/// The class name.
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string className() const { return "eoBinUxOver"; }
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/**
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* Uniform crossover for binary chromosomes.
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* @param chrom1 The first chromosome.
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* @param chrom2 The first chromosome.
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*/
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void operator()(Chrom& chrom1, Chrom& chrom2) const
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{
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unsigned min_size = min(chrom1.size(), chrom2.size());
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eoUniform<float> uniform(0, 1);
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for (unsigned bit = 0; bit < min_size; bit++)
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if (uniform() < rate)
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swap(chrom1[bit], chrom2[bit]);
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}
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public:
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float rate;
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};
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//-----------------------------------------------------------------------------
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//@}
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#endif eoBitOp_h
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