org.akraievoy.cnet.soo.domain.ConditionSooFitnessCapping.java Source code

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Here is the source code for org.akraievoy.cnet.soo.domain.ConditionSooFitnessCapping.java

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/*
 Copyright 2012 Anton Kraievoy akraievoy@gmail.com
 This file is part of Holonet.
    
 Holonet is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
    
 Holonet is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
    
 You should have received a copy of the GNU General Public License
 along with Holonet. If not, see <http://www.gnu.org/licenses/>.
 */

package org.akraievoy.cnet.soo.domain;

import com.google.common.base.Optional;
import org.akraievoy.cnet.opt.api.Condition;
import org.akraievoy.cnet.opt.api.GeneticStrategy;
import org.akraievoy.util.Interpolate;

import java.util.Collection;

public class ConditionSooFitnessCapping implements Condition<GenomeSoo> {
    private Optional<Double> fitnessCap = Optional.absent();

    public boolean isValid(GeneticStrategy<GenomeSoo> strategy, GenomeSoo child, Collection<GenomeSoo> generation,
            int generationIndex) {
        final GeneticStrategySoo strategySoo = (GeneticStrategySoo) strategy;

        if (!fitnessCap.isPresent()) {
            double fcTarget = strategySoo.getFitnessCap();
            fitnessCap = Optional.of(Interpolate
                    .norm(0, strategySoo.generationNum * 0.5, fcTarget * 0.85, fcTarget, Interpolate.LINEAR)
                    .apply(generationIndex));
        }

        final double fitness = child.getOrComputeFitness(strategy);
        final Double fitnessCap = this.fitnessCap.get();
        final boolean valid = fitness <= fitnessCap;

        /*
            System.out.printf("%g <= %g --> %s %n", fitness, fitnessCap, valid ? "valid" : "invalid");
        */

        return valid;
    }

    public String toString() {
        return "[ Fitness <= " + fitnessCap.get() + " ]";
    }
}