org.opt4j.optimizer.ea

Interface Selector

All Known Implementing Classes:

AlternativeNsga2, ElitismSelector, Nsga2, ScalingNsga2, SelectorDefault, Spea2

public interface Selector

The interface Selector is used to select a certain subset of Individuals from a Population by respecting certain metrics like their fitness. The core methods are getParents(int, java.util.Collection<org.opt4j.core.Individual>), that returns a set of Individuals that can be used as parents for the next generation and getLames(int, java.util.Collection<org.opt4j.core.Individual>), that returns a list of Individuals that can be removed from the given individual list in order to form the next generation.

Author:

glass, lukasiewycz

Method Summary

Modifier and Type	Method and Description
Collection<Individual>	getLames(int lambda, Collection<Individual> population) Selects a subset of lambda Individuals and returns it as a new Collection.
Collection<Individual>	getParents(int mu, Collection<Individual> population) Selects a subset of Individuals and returns it as a new Collection.
void	init(int maxsize) Sets the maximal number of Individuals.

Method Detail

getParents

Collection<Individual> getParents(int mu,
                                  Collection<Individual> population)

Selects a subset of Individuals and returns it as a new Collection. These so called parents can be used to form the next generation.

Parameters:

mu - the number of parents to select

population - the list of individuals

Returns:

the parents

getLames

Collection<Individual> getLames(int lambda,
                                Collection<Individual> population)

Selects a subset of lambda Individuals and returns it as a new Collection. These individuals can be erased in the next generation.

Parameters:

lambda - the number of lames to select

population - the list of individuals

Returns:

the worst lambda individuals

init

void init(int maxsize)

Sets the maximal number of Individuals.

Parameters:

maxsize - the number of individuals