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

Class UnimodalNormalDistributionCrossover

java.lang.Object

org.uma.jmetal.operator.crossover.impl.UnimodalNormalDistributionCrossover

All Implemented Interfaces:

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

public class UnimodalNormalDistributionCrossover
extends Object
implements CrossoverOperator<DoubleSolution>

This class implements the Unimodal Normal Distribution Crossover (UNDX) operator for real-valued solutions. UNDX is a multi-parent crossover operator that generates offspring based on the normal distribution defined by three parent solutions. It is particularly effective for continuous optimization problems as it preserves the statistics of the population.

Reference: Onikura, T., invalid input: '&' Kobayashi, S. (1999). Extended UNIMODAL DISTRIBUTION CROSSOVER for REAL-CODED GENETIC ALGORITHMS. In Proceedings of the 1999 Congress on Evolutionary Computation-CEC99 (Cat. No. 99TH8406) (Vol. 2, pp. 1581-1588). IEEE.

Author:

Antonio J. Nebro

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
UnimodalNormalDistributionCrossover(double crossoverProbability)	Constructor with default parameter values
UnimodalNormalDistributionCrossover(double crossoverProbability, double zeta, double eta, RepairDoubleSolution solutionRepair)	Constructor with all parameters
UnimodalNormalDistributionCrossover(double crossoverProbability, double zeta, double eta, RepairDoubleSolution solutionRepair, RandomGenerator<Double> randomGenerator)	Constructor with all parameters including random generator

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Details

UnimodalNormalDistributionCrossover

public UnimodalNormalDistributionCrossover(double crossoverProbability)

Constructor with default parameter values

Parameters:

crossoverProbability - Crossover probability (must be in [0,1])

UnimodalNormalDistributionCrossover

public UnimodalNormalDistributionCrossover(double crossoverProbability,
 double zeta,
 double eta,
 RepairDoubleSolution solutionRepair)

Constructor with all parameters

Parameters:

crossoverProbability - Crossover probability (must be in [0,1])

zeta - Controls the spread along the line connecting parents (typically in [0.1, 1.0], where smaller values produce offspring closer to the parents)

eta - Controls the spread in the orthogonal direction (typically in [0.1, 0.5], where smaller values produce more concentrated distributions)

solutionRepair - Strategy for repairing solutions

UnimodalNormalDistributionCrossover

public UnimodalNormalDistributionCrossover(double crossoverProbability,
 double zeta,
 double eta,
 RepairDoubleSolution solutionRepair,
 RandomGenerator<Double> randomGenerator)

Constructor with all parameters including random generator

Parameters:

crossoverProbability - Crossover probability

zeta - Controls the spread along the line connecting parents

eta - Controls the spread in the orthogonal direction

solutionRepair - Strategy for repairing solutions

randomGenerator - Random number generator

Throws:

IllegalArgumentException - if crossoverProbability is not in [0,1], or if zeta or eta are negative

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>

zeta

public double zeta()

Returns:

The zeta parameter

eta

public double eta()

Returns:

The eta parameter