4944881d7c
- added the eoNormMutation, simple normal mutation for simple real variables Modified Files: src/eo src/es/eoRealOp.h tutorial/Lesson2/FirstRealEA.cpp tutorial/Lesson3/SecondBitEA.cpp
314 lines
8.3 KiB
C++
314 lines
8.3 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoRealOp.h
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// (c) EEAAX 2000 - Maarten Keijzer 2000
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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: Marc.Schoenauer@polytechnique.fr
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mak@dhi.dk
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*/
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//-----------------------------------------------------------------------------
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#ifndef eoRealOp_h
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#define eoRealOp_h
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//-----------------------------------------------------------------------------
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#include <algorithm> // swap_ranges
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#include <utils/eoRNG.h>
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#include <es/eoReal.h>
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//-----------------------------------------------------------------------------
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/** eoUniformMutation --> changes all values of the vector
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by uniform choice with range epsilon
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with probability p_change per variable
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\class eoUniformMutation eoRealOp.h Tutorial/eoRealOp.h
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\ingroup parameteric
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*/
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template<class Chrom> class eoUniformMutation: 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 _epsilon the range for uniform nutation
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* @param _p_change the probability to change a given coordinate
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*/
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eoUniformMutation(const double& _epsilon, const double& _p_change = 1.0):
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epsilon(_epsilon), p_change(_p_change) {}
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/// The class name.
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string className() const { return "eoUniformMutation"; }
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/**
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* Do it!
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* @param chrom The cromosome undergoing the mutation
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*/
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void operator()(Chrom& chrom)
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{
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bool hasChanged=false;
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for (unsigned lieu=0; lieu<chrom.size(); lieu++)
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{
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if (rng.flip(p_change))
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{
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chrom[lieu] += 2*epsilon*rng.uniform()-epsilon;
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hasChanged = true;
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}
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}
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if (hasChanged)
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chrom.invalidate();
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}
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private:
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double epsilon;
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double p_change;
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};
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/** eoDetUniformMutation --> changes exactly k values of the vector
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by uniform choice with range epsilon
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\class eoDetUniformMutation eoRealOp.h Tutorial/eoRealOp.h
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\ingroup parameteric
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*/
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template<class Chrom> class eoDetUniformMutation: 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 _epsilon the range for uniform nutation
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* @param number of coordinate to modify
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*/
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eoDetUniformMutation(const double& _epsilon, const unsigned& _no = 1):
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epsilon(_epsilon), no(_no) {}
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/// The class name.
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string className() const { return "eoDetUniformMutation"; }
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/**
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* Do it!
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* @param chrom The cromosome undergoing the mutation
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*/
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void operator()(Chrom& chrom)
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{
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chrom.invalidate();
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for (unsigned i=0; i<no; i++)
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{
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unsigned lieu = rng.random(chrom.size());
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// actually, we should test that we don't re-modify same variable!
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chrom[lieu] += 2*epsilon*rng.uniform()-epsilon;
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}
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}
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private:
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double epsilon;
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unsigned no;
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};
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template<class Chrom> class eoNormalMutation: 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 _epsilon the range for uniform nutation
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* @param _p_change the probability to change a given coordinate
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*/
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eoNormalMutation(const double& _epsilon, const double& _p_change = 1.0):
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epsilon(_epsilon), p_change(_p_change) {}
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/// The class name.
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string className() const { return "eoNormalMutation"; }
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/**
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* Do it!
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* @param chrom The cromosome undergoing the mutation
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*/
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void operator()(Chrom& chrom)
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{
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bool hasChanged=false;
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for (unsigned lieu=0; lieu<chrom.size(); lieu++)
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{
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if (rng.flip(p_change))
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{
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chrom[lieu] += epsilon*rng.normal();
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hasChanged = true;
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}
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}
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if (hasChanged)
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chrom.invalidate();
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}
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private:
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double epsilon;
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double p_change;
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};
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// two arithmetical crossovers
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/** eoSegmentCrossover --> uniform choice in segment
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== arithmetical with same value along all coordinates
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\class eoSegmentCrossover eoRealOp.h Tutorial/eoRealOp.h
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\ingroup parameteric
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*/
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template<class Chrom> class eoSegmentCrossover: public eoQuadraticOp<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 _alpha the amount of exploration OUTSIDE the parents
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* as in BLX-alpha notation (Eshelman and Schaffer)
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* 0 == contractive application
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*/
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eoSegmentCrossover(const double& _alpha = 0.0) :
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alpha(_alpha), range(1+2*alpha) {}
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/// The class name.
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string className() const { return "eoSegmentCrossover"; }
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/**
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* segment crossover - modifies both parents
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* @param chrom1 The first parent
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* @param chrom2 The first parent
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*/
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void operator()(Chrom& chrom1, Chrom& chrom2)
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{
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unsigned i;
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double r1, r2, fact;
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fact = rng.uniform(range); // in [0,range)
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for (i=0; i<chrom1.size(); i++)
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{
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r1=chrom1[i];
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r2=chrom2[i];
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chrom1[i] = fact * r1 + (1-fact) * r2;
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chrom2[i] = (1-fact) * r1 + fact * r2;
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}
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chrom1.invalidate(); // shoudl test if fact was 0 or 1 :-)))
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chrom2.invalidate();
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}
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protected:
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double alpha;
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double range; // == 1+2*alpha
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};
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/** eoArithmeticCrossover --> uniform choice in hypercube
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== arithmetical with different values for each coordinate
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\class eoArithmeticCrossover eoRealOp.h Tutorial/eoRealOp.h
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\ingroup parameteric
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*/
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template<class Chrom> class eoArithmeticCrossover: public eoQuadraticOp<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 _alpha the amount of exploration OUTSIDE the parents
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* as in BLX-alpha notation (Eshelman and Schaffer)
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* 0 == contractive application
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*/
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eoArithmeticCrossover(const double& _alpha = 0.0):
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alpha(_alpha), range(1+2*alpha) {}
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/// The class name.
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string className() const { return "eoArithmeticCrossover"; }
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/**
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* arithmetical crossover - modifies both parents
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* @param chrom1 The first parent
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* @param chrom2 The first parent
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*/
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void operator()(Chrom& chrom1, Chrom& chrom2)
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{
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unsigned i;
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double r1, r2, fact;
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for (i=0; i<chrom1.size(); i++)
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{
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r1=chrom1[i];
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r2=chrom2[i];
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fact = rng.uniform(range); // in [0,range)
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chrom1[i] = fact * r1 + (1-fact) * r2;
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chrom2[i] = (1-fact) * r1 + fact * r2;
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}
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}
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protected:
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double alpha;
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double range; // == 1+2*alpha
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};
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/** eoRealUxOver --> Uniform crossover, also termed intermediate crossover
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\class eoRealUxOver eoRealOp.h Tutorial/eoRealOp.h
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\ingroup parameteric
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*/
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template<class Chrom> class eoRealUxOver: public eoQuadraticOp<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 _preference bias in the choice (usually, no bias == 0.5)
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*/
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eoRealUxOver(const float& _preference = 0.5): preference(_preference)
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{
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if ( (_preference <= 0.0) || (_preference >= 1.0) )
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runtime_error("UxOver --> invalid preference");
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}
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/// The class name.
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string className() const { return "eoRealUxOver"; }
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/**
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* Uniform crossover for real vectors
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* @param chrom1 The first parent
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* @param chrom2 The second parent
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* @runtime_error if sizes don't match
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*/
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void operator()(Chrom& chrom1, Chrom& chrom2)
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{
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if ( chrom1.size() != chrom2.size())
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runtime_error("UxOver --> chromosomes sizes don't match" );
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bool changed = false;
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for (unsigned int i=0; i<chrom1.size(); i++)
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{
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if (rng.flip(preference))
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if (chrom1[i] == chrom2[i])
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{
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double tmp = chrom1[i];
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chrom1[i]=chrom2[i];
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chrom2[i] = tmp;
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changed = true;
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}
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}
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if (changed)
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{
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chrom1.invalidate();
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chrom2.invalidate();
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}
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}
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private:
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float preference;
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};
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//-----------------------------------------------------------------------------
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//@}
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#endif eoRealOp_h
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