FloatChromosomeSinglePointArithmetic.java
package net.bmahe.genetics4j.core.combination.singlepointarithmetic;
import java.util.List;
import java.util.random.RandomGenerator;
import org.apache.commons.lang3.Validate;
import net.bmahe.genetics4j.core.chromosomes.Chromosome;
import net.bmahe.genetics4j.core.chromosomes.FloatChromosome;
import net.bmahe.genetics4j.core.combination.ChromosomeCombinator;
import net.bmahe.genetics4j.core.spec.AbstractEAConfiguration;
public class FloatChromosomeSinglePointArithmetic<T extends Comparable<T>> implements ChromosomeCombinator<T> {
private final RandomGenerator randomGenerator;
private final float alpha;
public FloatChromosomeSinglePointArithmetic(final RandomGenerator _randomGenerator, final float _alpha) {
Validate.notNull(_randomGenerator);
Validate.inclusiveBetween(0.0d, 1.0d, _alpha);
this.randomGenerator = _randomGenerator;
this.alpha = _alpha;
}
@Override
public List<Chromosome> combine(final AbstractEAConfiguration<T> eaConfiguration, final Chromosome chromosome1,
final T firstParentFitness, final Chromosome chromosome2, final T secondParentFitness) {
Validate.notNull(chromosome1);
Validate.notNull(chromosome2);
Validate.isInstanceOf(FloatChromosome.class, chromosome1);
Validate.isInstanceOf(FloatChromosome.class, chromosome2);
Validate.isTrue(chromosome1.getNumAlleles() == chromosome2.getNumAlleles());
final int alleleSplit = randomGenerator.nextInt(chromosome1.getNumAlleles());
final FloatChromosome intChromosome1 = (FloatChromosome) chromosome1;
final FloatChromosome intChromosome2 = (FloatChromosome) chromosome2;
final int numAlleles = chromosome1.getNumAlleles();
final float[] firstChildValues = new float[numAlleles];
final float[] secondChildValues = new float[numAlleles];
for (int i = 0; i < numAlleles; i++) {
final float firstAllele = intChromosome1.getAllele(i);
final float secondAllele = intChromosome2.getAllele(i);
if (i < alleleSplit) {
firstChildValues[i] = alpha * firstAllele + (1 - alpha) * secondAllele;
secondChildValues[i] = (1 - alpha) * firstAllele + alpha * secondAllele;
} else {
firstChildValues[i] = (1 - alpha) * firstAllele + alpha * secondAllele;
secondChildValues[i] = alpha * firstAllele + (1 - alpha) * secondAllele;
}
}
return List.of(
new FloatChromosome(numAlleles,
intChromosome1.getMinValue(),
intChromosome1.getMaxValue(),
firstChildValues),
new FloatChromosome(numAlleles,
intChromosome1.getMinValue(),
intChromosome1.getMaxValue(),
secondChildValues));
}
}