/*
* Artificial Intelligence for Humans
* Volume 2: Nature Inspired Algorithms
* Java Version
* http://www.aifh.org
* http://www.jeffheaton.com
*
* Code repository:
* https://github.com/jeffheaton/aifh
*
* Copyright 2014 by Jeff Heaton
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package com.heatonresearch.aifh.evolutionary.species;
import com.heatonresearch.aifh.AIFHError;
import com.heatonresearch.aifh.evolutionary.genome.Genome;
import com.heatonresearch.aifh.evolutionary.sort.SortGenomesForSpecies;
import com.heatonresearch.aifh.evolutionary.train.EvolutionaryAlgorithm;
import java.util.Collections;
import java.util.List;
/**
* This speciation strategy simply creates a single species that contains the
* entire population. Use this speciation strategy if you do not wish to use
* species.
*/
public class SingleSpeciation implements Speciation {
/**
* The trainer.
*/
private EvolutionaryAlgorithm owner;
/**
* The method used to sort the genomes in the species. More desirable
* genomes should come first for later selection.
*/
private SortGenomesForSpecies sortGenomes;
/**
* {@inheritDoc}
*/
@Override
public void init(final EvolutionaryAlgorithm theOwner) {
this.owner = theOwner;
this.sortGenomes = new SortGenomesForSpecies(this.owner);
}
/**
* {@inheritDoc}
*/
@Override
public void performSpeciation(final List<Genome> genomeList) {
updateShare();
final Species species = this.owner.getPopulation().getSpecies().get(0);
species.getMembers().clear();
species.getMembers().addAll(genomeList);
Collections.sort(species.getMembers(), this.sortGenomes);
species.setLeader(species.getMembers().get(0));
}
/**
* Update the species share of the next population.
*/
private void updateShare() {
final int speciesCount = this.owner.getPopulation().getSpecies().size();
if (speciesCount != 1) {
throw new AIFHError(
"SingleSpeciation can only be used with a species count of 1, species count is "
+ speciesCount);
}
final Species species = this.owner.getPopulation().getSpecies().get(0);
species.setOffspringCount(this.owner.getPopulation()
.getPopulationSize());
}
}