org.moeaframework.core.operator.grammar
Class GrammarMutation

java.lang.Object
  org.moeaframework.core.operator.grammar.GrammarMutation

All Implemented Interfaces:

Variation

public class GrammarMutation
extends Object
implements Variation

Uniform mutation for grammars. Each integer codon in the grammar representation is uniformly mutated with a specified probability.

This variation operator is type-safe.

Constructor Summary

GrammarMutation(double probability)
Constructs a uniform mutation operator for grammars with the specified probability of mutating each integer codon in the grammar representation.

Method Summary

static void	evolve(Grammar grammar, double probability) Performs uniform mutation on the specified grammar.
Solution[]	evolve(Solution[] parents) Evolves one or more parent solutions (specified by getArity) and produces one or more child solutions.
int	getArity() Returns the number of solutions that must be supplied to the evolve method.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GrammarMutation

public GrammarMutation(double probability)

Constructs a uniform mutation operator for grammars with the specified probability of mutating each integer codon in the grammar representation.

Parameters:

probability - the probability of mutating each integer codon in the grammar representation

Method Detail

evolve

public Solution[] evolve(Solution[] parents)

Description copied from interface: Variation

Evolves one or more parent solutions (specified by getArity) and produces one or more child solutions. By contract, the parents must not be modified. The copy constructor should be used to create copies of the parents with these copies subsequently modified.

Specified by:

evolve in interface Variation

Parameters:

parents - the array of parent solutions

Returns:

an array of child solutions

evolve

public static void evolve(Grammar grammar,
                          double probability)

Performs uniform mutation on the specified grammar. Each integer codon in the grammar representation is uniformly mutated with the specified probability in the range [0, getMaximumValue()-1].

Parameters:

grammar - the grammar to mutate

probability - the probability of mutating each integer codon in the grammar representation

getArity

public int getArity()

Description copied from interface: Variation

Returns the number of solutions that must be supplied to the evolve method.

Specified by:

getArity in interface Variation

Returns:

the number of solutions that must be supplied to the evolve method