eoGpMutate.h added containing 4 new mutation operators for eoParseTree class
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eo/src/gp/eoGpMutate.h
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eo/src/gp/eoGpMutate.h
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// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoGpMutate.h : GP mutation
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// (c) Jeroen Eggermont 2001 for mutation operators
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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: todos@geneura.ugr.es, http://geneura.ugr.es
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jeggermo@liacs.nl
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*/
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//-----------------------------------------------------------------------------
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#ifndef eoGpMutate_h
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#define eoGpMutate_h
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//-----------------------------------------------------------------------------
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#include <gp/eoParseTree.h>
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#include <list>
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#include <string>
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#include <EO.h>
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#include <eoOp.h>
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#include <gp/eoParseTree.h>
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#include <eoInit.h>
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using namespace gp_parse_tree;
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using namespace std;
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// Additional Mutation operators from
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// TITLE:"Genetic Programming~An Introduction"
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// AUTHORS: Banzhaf, Nordin, Keller, Francone
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// ISBN: 3-920993-58-6
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// ISBN: 1-55860-510-X
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//
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// For the eoParseTree class
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/** eoPointMutation --> replace a Node with a Node of the same arity
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\class eoPointMutation eoGpMutate.h gp/eoGpMutate.h
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*/
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template<class FType, class Node>
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class eoPointMutation: public eoMonOp< eoParseTree<FType, Node> >
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{
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public:
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typedef eoParseTree<FType, Node> EoType;
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/**
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* Constructor
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* @param _initializor The vector of Nodes given to the eoGpDepthInitializer
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*/
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eoPointMutation( vector<Node>& _initializor)
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: eoMonOp<EoType>(), initializor(_initializor)
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{};
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/// the class name
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virtual string className() const { return "eoPointMutation"; };
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/// Dtor
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virtual ~eoPointMutation() {};
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/**
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* Mutate an individual
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* @param _eo1 The individual that is to be changed
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*/
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bool operator()(EoType& _eo1 )
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{
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// select a random node i that is to be mutated
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int i = rng.random(_eo1.size());
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// request the arity of the node that is to be replaced
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int arity = _eo1[i].arity();
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int j=0;
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do
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{
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j = rng.random(initializor.size());
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}while ((initializor[j].arity() != arity) && (_eo1[i] != initializor[j]));
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_eo1[i] = initializor[j];
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return true;
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}
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private :
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vector<Node>& initializor;
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};
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/** eoExpansionMutation --> replace a terminal with a randomly created subtree
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\class eoExpansionMutation eoGpMutate.h gp/eoGpMutate.h
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*/
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template<class FType, class Node>
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class eoExpansionMutation: public eoMonOp< eoParseTree<FType, Node> >
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{
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public:
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typedef eoParseTree<FType, Node> EoType;
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/**
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* Constructor
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* @param _init An instantiation of eoGpDepthInitializer
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* @param _max_length the maximum size of an individual
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*/
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eoExpansionMutation(eoInit<EoType>& _init, unsigned _max_length)
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: eoMonOp<EoType>(), max_length(_max_length), initializer(_init)
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{};
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/// The class name
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virtual string className() const { return "eoExpansionMutation"; };
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/// Dtor
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virtual ~eoExpansionMutation() {};
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/**
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* Mutate an individual
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* @param _eo1 The individual that is to be changed
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*/
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bool operator()(EoType& _eo1 )
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{
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int i = rng.random(_eo1.size());
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// look for a terminal
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while (_eo1[i].arity() != 0)
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{
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i= rng.random(_eo1.size());
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};
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// create a new tree to
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EoType eo2;
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// make sure we get a tree with more than just a terminal
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do
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{
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initializer(eo2);
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}while(eo2.size() == 1);
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int j = rng.random(eo2.size());
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// make sure we select a subtree (and not a terminal)
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while((eo2[j].arity() == 0))
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{
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j = rng.random(eo2.size());
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};
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_eo1[i] = eo2[j]; // insert subtree
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_eo1.pruneTree(max_length);
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return true;
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}
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private :
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unsigned max_length;
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eoInit<EoType>& initializer;
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};
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/** eoCollapseSubtree --> replace a subtree with a randomly chosen terminal
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\class eoCollapseSubtreeMutation eoGpMutate.h gp/eoGpMutate.h
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*/
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template<class FType, class Node>
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class eoCollapseSubtreeMutation: public eoMonOp< eoParseTree<FType, Node> >
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{
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public:
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typedef eoParseTree<FType, Node> EoType;
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/**
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* Constructor
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* @param _init An instantiation of eoGpDepthInitializer
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* @param _max_length the maximum size of an individual
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*/
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eoCollapseSubtreeMutation(eoInit<EoType>& _init, unsigned _max_length)
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: eoMonOp<EoType>(), max_length(_max_length), initializer(_init)
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{};
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/// The class name
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virtual string className() const { return "eoCollapseSubtreeMutation"; };
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/// Dtor
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virtual ~eoCollapseSubtreeMutation() {};
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/**
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* Mutate an individual
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* @param _eo1 The individual that is to be changed
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*/
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bool operator()(EoType& _eo1 )
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{
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int i = rng.random(_eo1.size());
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// look for a subtree
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while ((_eo1[i].arity() == 0) && (_eo1.size() > 1))
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{
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i= rng.random(_eo1.size());
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};
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// create a new tree to
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EoType eo2;
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initializer(eo2);
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int j = rng.random(eo2.size());
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// make sure we select a subtree (and not a terminal)
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while(eo2[j].arity() != 0)
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{
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j = rng.random(eo2.size());
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};
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_eo1[i] = eo2[j]; // insert subtree
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// we don't have to prune because the subtree is always smaller
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_eo1.pruneTree(max_length);
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return true;
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}
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private :
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unsigned max_length;
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eoInit<EoType>& initializer;
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};
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/** eoHoist --> replace the individual with one of its subtree's
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\class eoHoist eoGpMutate.h gp/eoGpMutate.h
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*/
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template<class FType, class Node>
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class eoHoistMutation: public eoMonOp< eoParseTree<FType, Node> >
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{
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public:
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typedef eoParseTree<FType, Node> EoType;
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/**
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* Constructor
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*/
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eoHoistMutation()
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: eoMonOp<EoType>()
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{};
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/// The class name
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virtual string className() const { return "eoHoistMutation"; };
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/// Dtor
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virtual ~eoHoistMutation() {};
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/**
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* Mutate an individual
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* @param _eo1 The individual that is to be changed
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*/
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bool operator()(EoType& _eo1 )
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{
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// select a hoist point
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int i = rng.random(_eo1.size());
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// and create a new tree
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EoType eo2(_eo1[i]);
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// we don't have to prune because the new tree is always smaller
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//_eo1.pruneTree(max_length);
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_eo1 = eo2;
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return true;
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}
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private :
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};
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#endif
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