GenomeComparator.java

/*
 * Encog(tm) Core v3.4 - Java Version
 * http://www.heatonresearch.com/encog/
 * https://github.com/encog/encog-java-core
 
 * Copyright 2008-2016 Heaton Research, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *   
 * For more information on Heaton Research copyrights, licenses 
 * and trademarks visit:
 * http://www.heatonresearch.com/copyright
 */
package org.encog.ml.ea.sort;

import java.util.Comparator;

import org.encog.ml.ea.genome.Genome;

/**
 * Defines methods for comparing genomes. Also provides methods to apply bonuses
 * and penalties.
 */
public interface GenomeComparator extends Comparator<Genome> {
	/**
	 * Apply a bonus, this is a simple percent that is applied in the direction
	 * specified by the "should minimize" property of the score function.
	 * 
	 * @param value
	 *            The current value.
	 * @param bonus
	 *            The bonus.
	 * @return The resulting value.
	 */
	double applyBonus(double value, double bonus);

	/**
	 * Apply a penalty, this is a simple percent that is applied in the
	 * direction specified by the "should minimize" property of the score
	 * function.
	 * 
	 * @param value
	 *            The current value.
	 * @param bonus
	 *            The penalty.
	 * @return The resulting value.
	 */
	double applyPenalty(double value, double bonus);

	/**
	 * Determine if one score is better than the other.
	 * 
	 * @param d1
	 *            The first score to compare.
	 * @param d2
	 *            The second score to compare.
	 * @return True if d1 is better than d2.
	 */
	boolean isBetterThan(double d1, double d2);

	/**
	 * Determine if one genome is better than the other genome.
	 * 
	 * @param genome1
	 *            The first genome.
	 * @param genome2
	 *            The second genome.
	 * @return True, if genome1 is better than genome2.
	 */
	boolean isBetterThan(Genome genome1, Genome genome2);

	/**
	 * @return Returns true if the score should be minimized.
	 */
	boolean shouldMinimize();

}