org.moeaframework.algorithm.pso

Class SMPSO

java.lang.Object

org.moeaframework.algorithm.AbstractAlgorithm

org.moeaframework.algorithm.pso.AbstractPSOAlgorithm

org.moeaframework.algorithm.pso.SMPSO

All Implemented Interfaces:

Algorithm, Configurable, Stateful

public class SMPSO
extends AbstractPSOAlgorithm

Implementation of SMPSO, the speed-constrained multi-objective particle swarm optimizer.

References:

1. Nebro, A. J., J. J. Durillo, J. Garcia-Nieto, and C. A. Coello Coello (2009). SMPSO: A New PSO-based Metaheuristic for Multi-objective Optimization. 2009 IEEE Symposium on Computational Intelligence in Multi-Criteria Decision-Making, pp. 66-73.
2. Durillo, J. J., J. Garc�a-Nieto, A. J. Nebro, C. A. Coello Coello, F. Luna, and E. Alba (2009). Multi-Objective Particle Swarm Optimizers: An Experimental Comparison. Evolutionary Multi-Criterion Optimization, pp. 495-509.

Field Summary

Fields inherited from class org.moeaframework.algorithm.pso.AbstractPSOAlgorithm

archive, dominanceComparator, leaderComparator, leaders, localBestParticles, mutation, particles, velocities

Fields inherited from class org.moeaframework.algorithm.AbstractAlgorithm

initialized, numberOfEvaluations, problem, terminated

Constructor Summary

Constructors

Constructor and Description
SMPSO(Problem problem) Constructs a new SMPSO instance with default settings.
SMPSO(Problem problem, int swarmSize, int leaderSize, double mutationProbability, double distributionIndex) Constructs a new SMPSO instance.

Method Summary

Modifier and Type	Method and Description
protected double	constrictionCoefficient(double c1, double c2) Returns the velocity constriction coefficient.
protected void	mutate(int i) Applies the mutation operator to an individual particle.
protected void	updateVelocity(int i) Update the speed of an individual particle.

Methods inherited from class org.moeaframework.algorithm.pso.AbstractPSOAlgorithm

copyToList, getArchive, getLeaders, getLeaderSize, getLocalBestParticles, getMutation, getParticles, getResult, getSwarmSize, initialize, iterate, loadState, mutate, saveState, selectLeader, setArchive, setLeaderSize, setSwarmSize, updateLocalBest, updatePosition, updatePositions, updateVelocities

Methods inherited from class org.moeaframework.algorithm.AbstractAlgorithm

assertNotInitialized, evaluate, evaluateAll, evaluateAll, getNumberOfEvaluations, getProblem, isInitialized, isTerminated, step, terminate

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.moeaframework.core.configuration.Configurable

applyConfiguration, getConfiguration

Methods inherited from interface org.moeaframework.core.Algorithm

run, run

Methods inherited from interface org.moeaframework.core.Stateful

checkTypeSafety, getState, setState, writeTypeSafety

Constructor Detail

SMPSO

public SMPSO(Problem problem)

Constructs a new SMPSO instance with default settings.

Parameters:

problem - the problem

SMPSO

public SMPSO(Problem problem,
             int swarmSize,
             int leaderSize,
             double mutationProbability,
             double distributionIndex)

Constructs a new SMPSO instance.

Parameters:

problem - the problem

swarmSize - the number of particles

leaderSize - the number of leaders

mutationProbability - the mutation probability for PM

distributionIndex - the distribution index for PM

Method Detail

updateVelocity

protected void updateVelocity(int i)

Description copied from class: AbstractPSOAlgorithm

Update the speed of an individual particle.

Overrides:

updateVelocity in class AbstractPSOAlgorithm

Parameters:

i - the index of the particle

constrictionCoefficient

protected double constrictionCoefficient(double c1,
                                         double c2)

Returns the velocity constriction coefficient.

Parameters:

c1 - the velocity coefficient for the local best

c2 - the velocity coefficient for the leader

Returns:

the velocity constriction coefficient

mutate

protected void mutate(int i)

Description copied from class: AbstractPSOAlgorithm

Applies the mutation operator to an individual particle.

Overrides:

mutate in class AbstractPSOAlgorithm

Parameters:

i - the index of the particle