net.sourceforge.cilib.pso.dynamic.responsestrategies
Class ReevaluationReactionStrategy<E extends PopulationBasedAlgorithm>

java.lang.Object
  net.sourceforge.cilib.pso.dynamic.responsestrategies.EnvironmentChangeResponseStrategy<E>
      net.sourceforge.cilib.pso.dynamic.responsestrategies.ReevaluationReactionStrategy<E>

Type Parameters:

E - some population based algorithm

All Implemented Interfaces:

Serializable, Cloneable

public class ReevaluationReactionStrategy<E extends PopulationBasedAlgorithm>
extends EnvironmentChangeResponseStrategy<E>

This reaction strategy reevaluates the specified ratio of randomly chosen entities in the given Topology.

Author:

Theuns Cloete

See Also:

Serialized Form

Field Summary

protected Random	randomGenerator
protected double	reevaluationRatio

Fields inherited from class net.sourceforge.cilib.pso.dynamic.responsestrategies.EnvironmentChangeResponseStrategy

hasMemory

Constructor Summary

ReevaluationReactionStrategy()

ReevaluationReactionStrategy(ReevaluationReactionStrategy<E> rhs)

Method Summary

ReevaluationReactionStrategy<E>	getClone() Clone the EnvironmentChangeResponseStrategy object.
protected Random	getRandomGenerator() Retrieve the random number generator being used.
double	getReevaluationRatio() Get the ratio of entities that should be reevaluated.
void	performReaction(E algorithm) Just reevaluate the entities inside the topology.
protected void	reevaluate(List<? extends Entity> entities, int reevaluateCount) Reevaluate a specified percentage of the given entities.
protected void	setRandomGenerator(Random r) Set the random number generator to use.
void	setReevaluationRatio(double rer) Set the ratio of entities that should be reevaluated.

Methods inherited from class net.sourceforge.cilib.pso.dynamic.responsestrategies.EnvironmentChangeResponseStrategy

getHasMemory, respond, setHasMemory, updateNeighbourhoodBestEntities

Methods inherited from class java.lang.Object

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

Field Detail

reevaluationRatio

protected double reevaluationRatio

randomGenerator

protected Random randomGenerator

Constructor Detail

ReevaluationReactionStrategy

public ReevaluationReactionStrategy()

ReevaluationReactionStrategy

public ReevaluationReactionStrategy(ReevaluationReactionStrategy<E> rhs)

Method Detail

getClone

public ReevaluationReactionStrategy<E> getClone()

Description copied from class: EnvironmentChangeResponseStrategy

Clone the EnvironmentChangeResponseStrategy object.

Specified by:

getClone in interface Cloneable

Specified by:

getClone in class EnvironmentChangeResponseStrategy<E extends PopulationBasedAlgorithm>

Returns:

A cloned EnvironmentChangeResponseStrategy

See Also:

Object.clone()

performReaction

public void performReaction(E algorithm)

Just reevaluate the entities inside the topology. An entity's implementation should handle updating anything else that is necessary, e.g. a StandardParticle's personal best position in the case of PSO. This is the method responsible for responding that should be overridden by sub-classes.

Specified by:

performReaction in class EnvironmentChangeResponseStrategy<E extends PopulationBasedAlgorithm>

reevaluate

protected void reevaluate(List<? extends Entity> entities,
                          int reevaluateCount)

Reevaluate a specified percentage of the given entities.

Parameters:

entities - a List of entities that should be considered for reevaluation

reevaluateCount - an int specifying how many entities should be reevaluated

setReevaluationRatio

public void setReevaluationRatio(double rer)

Set the ratio of entities that should be reevaluated.

Parameters:

rer - a double value in the range (0.0, 1.0)

Throws:

{@link - IllegalArgumentException} when the ratio is not within the above mentioned range

getReevaluationRatio

public double getReevaluationRatio()

Get the ratio of entities that should be reevaluated.

Returns:

the ratio of entities that should be reevaluated

setRandomGenerator

protected void setRandomGenerator(Random r)

Set the random number generator to use.

Parameters:

r - a Random object

getRandomGenerator

protected Random getRandomGenerator()

Retrieve the random number generator being used.

Returns:

the Random object being used to generate a random sequence of numbers