org.artoflife.gp.population
Class SelectorGenerationalPopulation

java.lang.Object
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  +--org.artoflife.gp.Population
        |
        +--org.artoflife.gp.population.GenerationalPopulation
              |
              +--org.artoflife.gp.population.SelectorGenerationalPopulation

All Implemented Interfaces:

java.io.Serializable

public class SelectorGenerationalPopulation

extends GenerationalPopulation

A GenerationalPopulation which culls a configurable random number of Individuals every generation from the least fit of the population.

Author:

Steve Meyfroidt

See Also:

Serialized Form

Field Summary

protected int	maxCull
protected int	minCull

Fields inherited from class org.artoflife.gp.population.GenerationalPopulation

FITNESS_COMPARATOR, individualClass, populationSize, selectorClass

Fields inherited from class org.artoflife.gp.Population

individuals

Constructor Summary

SelectorGenerationalPopulation(int populationSize, java.lang.Class individualClass, int minCull, int maxCull, java.util.SortedMap reproducers)

Method Summary

protected void	cullOneWeakest()
protected void	cullWeakest() Cull a random number of Individuals between minCull and maxCull from the least fit Individuals.

Methods inherited from class org.artoflife.gp.population.GenerationalPopulation

breed, getIdealPopulationSize, makeSelector, newIndividual, setIdealPopulationSize, setSelectorClass

Methods inherited from class org.artoflife.gp.Population

addIndividual, addNewIndividuals, addPopulationListener, breedNewIndividual, firePopulationEvent, getIndividuals, getReproducers, newGeneration, removeIndividual, removePopulationListener

Methods inherited from class java.lang.Object

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

Field Detail

minCull

protected int minCull

maxCull

protected int maxCull

Constructor Detail

SelectorGenerationalPopulation

public SelectorGenerationalPopulation(int populationSize,
                                      java.lang.Class individualClass,
                                      int minCull,
                                      int maxCull,
                                      java.util.SortedMap reproducers)

Parameters:

populationSize - how many Individuals in this fixed size population? Must be > 2

individualClass - Class of individuals to create as initial population. Must be non-null

minCull - minimum number of Individuals to cull at end of each generation. Must be > -1

maxCull - maximum number of Individuals to cull at start of each new generation. Must be >= minCull

Method Detail

cullWeakest

protected void cullWeakest()

Cull a random number of Individuals between minCull and maxCull from the least fit Individuals.

Specified by:

cullWeakest in class Population

See Also:

Population.cullOneWeakest()

cullOneWeakest

protected void cullOneWeakest()

Specified by:

cullOneWeakest in class Population

See Also:

Population.cullOneWeakest()