net.sourceforge.cilib.pso.dynamic.detectionstrategies
Class RandomSentriesDetectionStrategy<E extends PopulationBasedAlgorithm>

java.lang.Object
  net.sourceforge.cilib.pso.dynamic.detectionstrategies.EnvironmentChangeDetectionStrategy<E>
      net.sourceforge.cilib.pso.dynamic.detectionstrategies.RandomSentriesDetectionStrategy<E>

Type Parameters:

E - some population based algorithm

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

RandomSentryPointsDetectionStrategy

public class RandomSentriesDetectionStrategy<E extends PopulationBasedAlgorithm>
extends EnvironmentChangeDetectionStrategy<E>

This class defines a detection strategy that uses a user-specified number of sentry entities and an value to detect whether a change has occured in the environment.

Author:

Theuns Cloete

See Also:

Serialized Form

Field Summary

protected ControlParameter	numberOfSentries
protected Random	randomGenerator

Fields inherited from class net.sourceforge.cilib.pso.dynamic.detectionstrategies.EnvironmentChangeDetectionStrategy

epsilon, interval

Constructor Summary

RandomSentriesDetectionStrategy()

RandomSentriesDetectionStrategy(RandomSentriesDetectionStrategy<E> rhs)

Method Summary

boolean	detect(E algorithm) After every EnvironmentChangeDetectionStrategy.interval iterations, pick a number of random entities from the given algorithm's topology and compare their previous fitness values with their current fitness values.
RandomSentriesDetectionStrategy<E>	getClone() Clone the EnvironmentChangeDetectionStrategy object.
ControlParameter	getNumberOfSentries()
Random	getRandomNumberGenerator()
void	setNumberOfSentries(ControlParameter parameter)
void	setRandomNumberGenerator(Random rng)

Methods inherited from class net.sourceforge.cilib.pso.dynamic.detectionstrategies.EnvironmentChangeDetectionStrategy

getEpsilon, getIterationsModulus, setEpsilon, setIterationsModulus

Methods inherited from class java.lang.Object

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

Field Detail

numberOfSentries

protected ControlParameter numberOfSentries

randomGenerator

protected Random randomGenerator

Constructor Detail

RandomSentriesDetectionStrategy

public RandomSentriesDetectionStrategy()

RandomSentriesDetectionStrategy

public RandomSentriesDetectionStrategy(RandomSentriesDetectionStrategy<E> rhs)

Method Detail

getClone

public RandomSentriesDetectionStrategy<E> getClone()

Description copied from class: EnvironmentChangeDetectionStrategy

Clone the EnvironmentChangeDetectionStrategy object.

Specified by:

getClone in interface Cloneable

Specified by:

getClone in class EnvironmentChangeDetectionStrategy<E extends PopulationBasedAlgorithm>

Returns:

A cloned EnvironmentChangeDetectionStrategy

See Also:

Object.clone()

detect

public boolean detect(E algorithm)

After every EnvironmentChangeDetectionStrategy.interval iterations, pick a number of random entities from the given algorithm's topology and compare their previous fitness values with their current fitness values. An environment change is detected when the difference between the previous and current fitness values are >= the specified EnvironmentChangeDetectionStrategy.epsilon value.

Specified by:

detect in class EnvironmentChangeDetectionStrategy<E extends PopulationBasedAlgorithm>

Parameters:

algorithm - used to get hold of topology of entities and number of iterations

Returns:

true if a change has been detected, false otherwise

setNumberOfSentries

public void setNumberOfSentries(ControlParameter parameter)

getNumberOfSentries

public ControlParameter getNumberOfSentries()

setRandomNumberGenerator

public void setRandomNumberGenerator(Random rng)

getRandomNumberGenerator

public Random getRandomNumberGenerator()