org.moeaframework.core.operator
Class AdaptiveMultimethodVariation

java.lang.Object
  org.moeaframework.core.operator.AdaptiveMultimethodVariation

All Implemented Interfaces:

Variation

public class AdaptiveMultimethodVariation
extends Object
implements Variation

Auto-adaptive multi-method recombination operator. Applies operators with probabilities proportional to the number of offspring produced by each operator in the archive.

Field Summary

static String

OPERATOR_ATTRIBUTE The attribute for the operator index.

Constructor Summary

AdaptiveMultimethodVariation(Population archive)
Constructs an auto-adaptive multi-method recombination operator with the specified archive for updating probabilities.

Method Summary

void	addOperator(Variation operator) Adds an operator to be used in the auto-adaptive multi-method recombination.
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.
int	getNumberOfOperators() Returns the number of available operators.
Variation	getOperator(int index) Returns the operator at the specified index.
protected double[]	getOperatorProbabilities() Returns the array of probabilities of applying each operator.
double	getOperatorProbability(int index) Returns the probability that the operator at the specified index is applied.
int	getUpdateWindow() Returns the number of invocations of the evolve method between updating the operator selection probabilities.
protected int	selectOperator() Returns the index of one of the available operators randomly selected using the probabilities.

Methods inherited from class java.lang.Object

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

Field Detail

OPERATOR_ATTRIBUTE

public static final String OPERATOR_ATTRIBUTE

The attribute for the operator index.

See Also:

Constant Field Values

Constructor Detail

AdaptiveMultimethodVariation

public AdaptiveMultimethodVariation(Population archive)

Constructs an auto-adaptive multi-method recombination operator with the specified archive for updating probabilities.

Parameters:

archive - the archive used to update the probabilities

Method Detail

getUpdateWindow

public int getUpdateWindow()

Returns the number of invocations of the evolve method between updating the operator selection probabilities.

Returns:

the number of invocations of the evolve method between updating the operator selection probabilities

addOperator

public void addOperator(Variation operator)

Adds an operator to be used in the auto-adaptive multi-method recombination.

Parameters:

operator - the operator

getNumberOfOperators

public int getNumberOfOperators()

Returns the number of available operators.

Returns:

the number of available operators

getOperator

public Variation getOperator(int index)

Returns the operator at the specified index.

Parameters:

index - the index of the operator to be returned

Returns:

the operator at the specified index

getOperatorProbability

public double getOperatorProbability(int index)

Returns the probability that the operator at the specified index is applied.

Parameters:

index - the index of the operator whose probability is returned

Returns:

the probability that the operator at the specified index is applied

getOperatorProbabilities

protected double[] getOperatorProbabilities()

Returns the array of probabilities of applying each operator.

Returns:

the array of probabilities of applying each operator

selectOperator

protected int selectOperator()

Returns the index of one of the available operators randomly selected using the probabilities.

Returns:

the index of one of the available operators randomly selected using the probabilities

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

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