/** * Constructs a new IBEA instance. * * @param problem the problem * @param archive the external archive; or {@code null} if no external archive is used * @param initialization the initialization operator * @param variation the variation operator * @param fitnessEvaluator the indicator fitness evaluator to use (e.g., hypervolume * additive-epsilon indicator) */ public IBEA( Problem problem, NondominatedPopulation archive, Initialization initialization, Variation variation, IndicatorFitnessEvaluator fitnessEvaluator) { super(problem, new Population(), archive, initialization); this.variation = variation; this.fitnessEvaluator = fitnessEvaluator; fitnessComparator = new FitnessComparator(fitnessEvaluator.areLargerValuesPreferred()); selection = new TournamentSelection(fitnessComparator); }