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EAStrategy Class Reference

Search strategy for an evolutionary algorithm. More...

#include <strategy.h>

List of all members.

Public Types
enum	traceflags
Public Methods
	EAStrategy (SimplePopulation &popula)
void	evolve (EAEnvironment &envr, TextOStream &out, TextOStream &log)
virtual void	addFeaturesTo (Genome &genome) const
void	print (TextOStream &out)
void	recombine (const SelectionSituation &situation, const SelectionMatrix &selmat)
void	check () const
Protected Attributes
SimplePopulation &	mrPopula
Array< Individual > *	mpNextGen
bool	allow_same_parents

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Detailed Description

Search strategy for an evolutionary algorithm.

You should not confuse this with Evolution Strategies, which is one kind of evolution strategy for real-valued genes.

The strategy is distinguished from the population, as alternative strategies could be used for a population.

Definition at line 28 of file strategy.h.

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Member Enumeration Documentation

enum traceflags

OStream flags for outputting some trace information. Definition at line 71 of file strategy.h.

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Constructor & Destructor Documentation

EAStrategy (  SimplePopulation &    popula )

Attaches the strategy to the given population. The class currently supports only linear SimplePopulation. Definition at line 60 of file population.cc. References allow_same_parents, SimplePopulation::mElites, mpNextGen, mrPopula, and SimplePopulation::size().

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Member Function Documentation

void addFeaturesTo (  Genome &    genome )  const [virtual]

Adds strategy-dependent features to the given genome. Definition at line 186 of file population.cc.

void check (    )

Implementation for Object. Definition at line 210 of file population.cc. References mpNextGen. Referenced by SimplePopulation::check().

void evolve (  EAEnvironment &    envr, TextOStream &    out, TextOStream &    log )

Evolves a population to adapt to an environment. Parameters: envr  Environment where the population evolves in. out  Output stream. log  Logging stream for brief evolution logs. Definition at line 86 of file population.cc. References Individual::addking(), EAEnvironment::cycleReport(), Individual::evaluate(), SimplePopulation::evaluate(), SelectionSituation::getOrdered(), EAEnvironment::init_cycle(), SimplePopulation::mElites, mrPopula, recombine(), and SimplePopulation::report(). Referenced by SimplePopulation::evolve().

void print (  TextOStream &    out )

Prints some strategic information to the given stream. Definition at line 189 of file population.cc. References MutationRate::binaryRate(), MutationRate::doubleRate(), MutationRate::doubleVariance(), MutationRate::intRate(), SimplePopulation::mElites, mrPopula, SelectionPrms::muFor(), SimplePopulation::mutRate(), SimplePopulation::selParams(), and SimplePopulation::size(). Referenced by SimplePopulation::SimplePopulation().

void recombine (  const SelectionSituation &    situation, const SelectionMatrix &    selmat )

Forms the next generation, usually by recombining parent individuals as offspring. Parameters: pop_order  The population of individuals in an array that is ordered according to their fitnesses. selmat  Selection matrix that contains the pairwise selection probabilities for the potential pairs of parents. See SelectionMatrix for more information about selection. Definition at line 125 of file population.cc. References SelectionSituation::getOrdered(), SimplePopulation::mElites, mpNextGen, SimplePopulation::mpPopulation, mrPopula, SimplePopulation::mutRate(), SelectionMatrix::selectRandomPair(), and SimplePopulation::size(). Referenced by evolve().

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Member Data Documentation

bool allow_same_parents [protected]

Mode flag dictating whether to allow self-breeding or not. Definition at line 84 of file strategy.h. Referenced by EAStrategy().

Array<Individual>* mpNextGen [protected]

An array holding the individuals of "next generation". Definition at line 81 of file strategy.h. Referenced by check(), EAStrategy(), and recombine().

SimplePopulation& mrPopula [protected]

The population that is being evolved with this strategy. Definition at line 78 of file strategy.h. Referenced by EAStrategy(), evolve(), print(), and recombine().

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The documentation for this class was generated from the following files:

• strategy.h
• population.cc

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