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

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, leaderSize, localBestParticles, mutation, particles, swarmSize, velocities

Fields inherited from class org.moeaframework.algorithm.AbstractAlgorithm

initialized, numberOfEvaluations, problem, terminated

Constructor Summary

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

Method Summary

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

getResult, initialize, iterate, mutate, selectLeader, updateLocalBest, updatePosition, updatePositions, updateVelocities

Methods inherited from class org.moeaframework.algorithm.AbstractAlgorithm

evaluate, evaluateAll, evaluateAll, finalize, getNumberOfEvaluations, getProblem, getState, isInitialized, isTerminated, setState, step, terminate

Methods inherited from class java.lang.Object

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

Constructor Detail

SMPSO

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

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