/**
* Verifies that terminals are passed as clones during evolution and not as references. Thanx a
* lot Javier for pointing this out nicely!
*
* @throws Exception
* @author Klaus Meffert
* @since 3.2
*/
public void testReferenceProblem_0() throws Exception {
m_gpconf.setPopulationSize(30);
m_gpconf.setGPFitnessEvaluator(new DeltaGPFitnessEvaluator());
m_gpconf.setFitnessFunction(new TerminalsOnly());
m_gpconf.setRandomGenerator(new StockRandomGenerator());
//
Class[] types = {CommandGene.IntegerClass};
Class[][] argTypes = {{}};
CommandGene[][] nodeSets = {
{
new Increment(m_gpconf, CommandGene.IntegerClass, 1),
new Terminal(m_gpconf, CommandGene.IntegerClass, 1.0d, 10000.0d),
}
};
GPGenotype gen =
GPGenotype.randomInitialGenotype(m_gpconf, types, argTypes, nodeSets, 10, false);
gen.getGPPopulation().sort(new TerminalsFirstComparator());
IGPProgram prog1 = gen.getGPPopulation().getGPProgram(0);
ProgramChromosome chrom1 = prog1.getChromosome(0);
Terminal gene1 = (Terminal) chrom1.getGene(0);
IGPProgram prog2 = gen.getGPPopulation().getGPProgram(1);
ProgramChromosome chrom2 = prog2.getChromosome(0);
Terminal gene2 = (Terminal) chrom2.getGene(0);
assertNotSame(gene1, gene2);
}
protected double evaluate(IGPProgram a_subject) {
ProgramChromosome chrom1 = a_subject.getChromosome(0);
CommandGene gene1 = chrom1.getGene(0);
if (gene1 instanceof Terminal) {
return gene1.execute_double(null, 0, new Object[] {});
} else {
return 999999.0d;
}
}
@Override
public float execute_float(ProgramChromosome c, int n, Object[] args) {
int size = size();
DescriptiveStatistics stats = new DescriptiveStatistics();
for (int i = 0; i < size; i++) {
stats.addValue(c.execute_float(n, i, args));
}
return (float) stats.getSkewness();
}