/**
* Returns a new {@link NSGAII} instance.
*
* @param properties the properties for customizing the new {@code NSGAII} instance
* @param problem the problem
* @return a new {@code NSGAII} instance
*/
private Algorithm newNSGAII(TypedProperties properties, Problem problem) {
int populationSize = (int) properties.getDouble("populationSize", 100);
Initialization initialization = new RandomInitialization(problem, populationSize);
NondominatedSortingPopulation population = new NondominatedSortingPopulation();
TournamentSelection selection = null;
if (properties.getBoolean("withReplacement", true)) {
selection =
new TournamentSelection(
2, new ChainedComparator(new ParetoDominanceComparator(), new CrowdingComparator()));
}
Variation variation = OperatorFactory.getInstance().getVariation(null, properties, problem);
return new NSGAII(problem, population, null, selection, variation, initialization);
}
