Package org.uma.jmetal.operator.crossover.impl

Class DifferentialEvolutionCrossover

java.lang.Object

org.uma.jmetal.operator.crossover.impl.DifferentialEvolutionCrossover

All Implemented Interfaces:

Serializable, CrossoverOperator<DoubleSolution>, Operator<List<DoubleSolution>,List<DoubleSolution>>

public class DifferentialEvolutionCrossover
extends Object
implements CrossoverOperator<DoubleSolution>

Differential evolution crossover operator

Author:

Antonio J. Nebro

Comments: - The operator receives two parameters: the current individual and an array of three parent individuals - The best and rand variants depends on the third parent, according whether it represents the current of the "best" individual or a random one. The implementation of both variants are the same, due to that the parent selection is external to the crossover operator. - Implemented variants: - rand/1/bin (best/1/bin) - rand/1/exp (best/1/exp) - current-to-rand/1 (current-to-best/1) - current-to-rand/1/bin (current-to-best/1/bin) - current-to-rand/1/exp (current-to-best/1/exp)

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	DifferentialEvolutionCrossover.DE_CROSSOVER_TYPE
static enum	DifferentialEvolutionCrossover.DE_MUTATION_TYPE
static enum	DifferentialEvolutionCrossover.DE_VARIANT

Constructor Summary

Constructors

Constructor	Description
DifferentialEvolutionCrossover()	Constructor
DifferentialEvolutionCrossover(double cr, double f, DifferentialEvolutionCrossover.DE_VARIANT variant)	Constructor
DifferentialEvolutionCrossover(double cr, double f, DifferentialEvolutionCrossover.DE_VARIANT variant, BoundedRandomGenerator<Integer> jRandomGenerator, BoundedRandomGenerator<Double> crRandomGenerator)	Constructor
DifferentialEvolutionCrossover(double cr, double f, DifferentialEvolutionCrossover.DE_VARIANT variant, RandomGenerator<Double> randomGenerator)	Constructor

Method Summary

Modifier and Type	Method	Description
double	crossoverProbability()
List<DoubleSolution>	execute(List<DoubleSolution> parentSolutions)	Execute() method
double	getCr()
DifferentialEvolutionCrossover.DE_CROSSOVER_TYPE	getCrossoverType()
double	getF()
DifferentialEvolutionCrossover.DE_MUTATION_TYPE	getMutationType()
int	getNumberOfDifferenceVectors()
DifferentialEvolutionCrossover.DE_VARIANT	getVariant()
static DifferentialEvolutionCrossover.DE_VARIANT	getVariantFromString(String variant)
int	numberOfGeneratedChildren()
int	numberOfRequiredParents()
void	setBestSolution(DoubleSolution bestSolution)
void	setCr(double cr)
void	setCurrentSolution(DoubleSolution current)
void	setF(double f)

Methods inherited from class java.lang.Object

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

Constructor Details

DifferentialEvolutionCrossover

public DifferentialEvolutionCrossover()

Constructor

DifferentialEvolutionCrossover

public DifferentialEvolutionCrossover(double cr,
 double f,
 DifferentialEvolutionCrossover.DE_VARIANT variant)

Constructor

Parameters:

cr -

f -

variant -

DifferentialEvolutionCrossover

public DifferentialEvolutionCrossover(double cr,
 double f,
 DifferentialEvolutionCrossover.DE_VARIANT variant,
 RandomGenerator<Double> randomGenerator)

Constructor

Parameters:

cr -

f -

variant -

randomGenerator -

DifferentialEvolutionCrossover

public DifferentialEvolutionCrossover(double cr,
 double f,
 DifferentialEvolutionCrossover.DE_VARIANT variant,
 BoundedRandomGenerator<Integer> jRandomGenerator,
 BoundedRandomGenerator<Double> crRandomGenerator)

Constructor

Parameters:

cr -

f -

variant -

jRandomGenerator -

crRandomGenerator -

Method Details

getCr

public double getCr()

getF

public double getF()

getVariant

public DifferentialEvolutionCrossover.DE_VARIANT getVariant()

getNumberOfDifferenceVectors

public int getNumberOfDifferenceVectors()

getCrossoverType

public DifferentialEvolutionCrossover.DE_CROSSOVER_TYPE getCrossoverType()

getMutationType

public DifferentialEvolutionCrossover.DE_MUTATION_TYPE getMutationType()

numberOfRequiredParents

public int numberOfRequiredParents()

Specified by:

numberOfRequiredParents in interface CrossoverOperator<DoubleSolution>

numberOfGeneratedChildren

public int numberOfGeneratedChildren()

Specified by:

numberOfGeneratedChildren in interface CrossoverOperator<DoubleSolution>

crossoverProbability

public double crossoverProbability()

Specified by:

crossoverProbability in interface CrossoverOperator<DoubleSolution>

setCurrentSolution

public void setCurrentSolution(DoubleSolution current)

setBestSolution

public void setBestSolution(DoubleSolution bestSolution)

setCr

public void setCr(double cr)

setF

public void setF(double f)

execute

public List<DoubleSolution> execute(List<DoubleSolution> parentSolutions)

Execute() method

Specified by:

execute in interface Operator<List<DoubleSolution>,List<DoubleSolution>>

Parameters:

parentSolutions - The data to process

getVariantFromString

public static DifferentialEvolutionCrossover.DE_VARIANT getVariantFromString(String variant)