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

Class LaplaceCrossover

java.lang.Object

org.uma.jmetal.operator.crossover.impl.LaplaceCrossover

All Implemented Interfaces:

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

public class LaplaceCrossover
extends Object
implements CrossoverOperator<DoubleSolution>

This class implements a Laplace Crossover (LX) operator for real-valued solutions. The Laplace Crossover uses the Laplace distribution to generate offspring solutions. The scale parameter (b) controls the spread of the distribution around the parent solutions. The scale parameter must be a positive value (scale > 0). Typical values range between 0.1 and 0.5, where smaller values generate offspring closer to the parents and larger values produce more diverse offspring.

Reference: Deep, K., Thakur, M. (2007). A new crossover operator for real coded genetic algorithms. Applied Mathematics and Computation, 188(1), 895-911.

Author:

Antonio J. Nebro

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
LaplaceCrossover(double crossoverProbability)	Constructor with default scale parameter
LaplaceCrossover(double crossoverProbability, double scale, RepairDoubleSolution solutionRepair)	Constructor with configurable scale parameter
LaplaceCrossover(double crossoverProbability, double scale, RepairDoubleSolution solutionRepair, RandomGenerator<Double> randomGenerator)	Constructor with configurable random generator

Method Summary

Modifier and Type	Method	Description
double	crossoverProbability()
List<DoubleSolution>	execute(List<DoubleSolution> solutions)
double	getScale()
int	numberOfGeneratedChildren()
int	numberOfRequiredParents()

Methods inherited from class java.lang.Object

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

Constructor Details

LaplaceCrossover

public LaplaceCrossover(double crossoverProbability)

Constructor with default scale parameter

LaplaceCrossover

public LaplaceCrossover(double crossoverProbability,
 double scale,
 RepairDoubleSolution solutionRepair)

Constructor with configurable scale parameter

LaplaceCrossover

public LaplaceCrossover(double crossoverProbability,
 double scale,
 RepairDoubleSolution solutionRepair,
 RandomGenerator<Double> randomGenerator)

Constructor with configurable random generator

Method Details

execute

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

Specified by:

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

Parameters:

solutions - The data to process

crossoverProbability

public double crossoverProbability()

Specified by:

crossoverProbability in interface CrossoverOperator<DoubleSolution>

numberOfRequiredParents

public int numberOfRequiredParents()

Specified by:

numberOfRequiredParents in interface CrossoverOperator<DoubleSolution>

numberOfGeneratedChildren

public int numberOfGeneratedChildren()

Specified by:

numberOfGeneratedChildren in interface CrossoverOperator<DoubleSolution>

getScale

public double getScale()