org.jgap

Interface INaturalSelector

All Superinterfaces:

java.io.Serializable

All Known Implementing Classes:

BestChromosomesSelector, NaturalSelector, NaturalSelectorExt, StandardPostSelector, ThresholdSelector, TournamentSelector, WeightedRouletteSelector

public interface INaturalSelector
extends java.io.Serializable

Natural selectors are responsible for actually selecting a specified number of Chromosome specimens from a population, using the fitness values as a guide. Usually fitness is treated as a statistic probability of survival, not as the sole determining factor. Therefore, Chromosomes with higher fitness values are more likely to survive than those with lesser fitness values, but it's not guaranteed.

Since:

2.0

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CVS_REVISION String containing the CVS revision.

Method Summary

Modifier and Type	Method and Description
void	empty() Empty out the working pool of Chromosomes.
boolean	returnsUniqueChromosomes()
void	select(int a_howManyToSelect, Population a_from_population, Population a_to_population) Select a given number of Chromosomes from the pool that will move on to the next generation population.

Field Detail

CVS_REVISION

static final java.lang.String CVS_REVISION

String containing the CVS revision. Read out via reflection!

See Also:

Constant Field Values

Method Detail

select

void select(int a_howManyToSelect,
            Population a_from_population,
            Population a_to_population)

Select a given number of Chromosomes from the pool that will move on to the next generation population. This selection should be guided by the fitness values, but fitness should be treated as a statistical probability of survival, not as the sole determining factor. In other words, Chromosomes with higher fitness values should be more likely to be selected than those with lower fitness values, but it should not be guaranteed.

Parameters:

a_howManyToSelect - the number of Chromosomes to select

a_from_population - the population the Chromosomes will be selected from

a_to_population - the population the Chromosomes will be added to

Since:

2.0 (since 1.0 with different return type)

empty

void empty()

Empty out the working pool of Chromosomes. This will be invoked after each evolution cycle so that the natural selector can be reused for the next one.

Since:

1.0

returnsUniqueChromosomes

boolean returnsUniqueChromosomes()

Returns:

true: The implementation of the NaturalSelector only returns unique Chromosome's (example: BestChromosomesSelector). false: Also doublettes could be returned (example: WeightedRouletteSelector).

Since:

2.0