Package unifeat.featureSelection.wrapper.PSOBasedMethods

Class BasicParticle<PosType,VelType>

java.lang.Object

unifeat.featureSelection.wrapper.PSOBasedMethods.BasicParticle<PosType,VelType>

Type Parameters:

PosType - the type of position vector of each particle

VelType - the type of velocity vector of each particle

Direct Known Subclasses:

Particle, Particle, Particle, Particle

public abstract class BasicParticle<PosType,VelType>
extends Object

The abstract class contains the main methods and fields that are used in all PSO-based feature selection methods. This class is used to represent a particle in PSO algorithm.

Author:

Sina Tabakhi

Field Summary

Fields

Modifier and Type	Field	Description
private double	fitness
PosType[]	pBest
private double	pBestFitness
PosType[]	position
VelType[]	velocity

Constructor Summary

Constructors

Constructor	Description
BasicParticle(Class<PosType> pos, Class<VelType> vel, Integer dimension)	Initializes the parameters

Method Summary

Modifier and Type	Method	Description
double	getFitness()	This method returns the fitness value of the particle.
double	getPBestFitness()	This method returns the fitness value of best position of the particle (personal best)
abstract int	numSelectedFeatures()	This method returns the number of selected features by the particle based on position vector.
abstract int[]	selectedFeaturesSubset()	This method returns the indices of selected features by the particle based on position vector.
void	setFitness(double fitness)	This method sets the fitness value of the particle.
void	setPBestFitness(double pBestFitness)	This method sets the fitness value of best position of the particle (personal best)

Methods inherited from class java.lang.Object

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

Field Details

position

public PosType[] position

velocity

public VelType[] velocity

fitness

private double fitness

pBest

public PosType[] pBest

pBestFitness

private double pBestFitness

Constructor Details

BasicParticle

public BasicParticle(Class<PosType> pos,
 Class<VelType> vel,
 Integer dimension)

Initializes the parameters

Parameters:

pos - the type of position vector of each particle

vel - the type of velocity vector of each particle

dimension - the dimension of problem which equals to total number of features in the dataset

Method Details

numSelectedFeatures

public abstract int numSelectedFeatures()

This method returns the number of selected features by the particle based on position vector.

Returns:

number of selected features by the particle

selectedFeaturesSubset

public abstract int[] selectedFeaturesSubset()

This method returns the indices of selected features by the particle based on position vector.

Returns:

the array of indices of the selected features by the particle

getFitness

public double getFitness()

This method returns the fitness value of the particle.

Returns:

the fitness value of the particle

setFitness

public void setFitness(double fitness)

This method sets the fitness value of the particle.

Parameters:

fitness - the fitness value of the particle

getPBestFitness

public double getPBestFitness()

This method returns the fitness value of best position of the particle (personal best)

Returns:

the fitness value of best position of the particle

setPBestFitness

public void setPBestFitness(double pBestFitness)

This method sets the fitness value of best position of the particle (personal best)

Parameters:

pBestFitness - the fitness value of best position of the particle