ComplexityAdjustedScore.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.score.adjust;

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

/**
 * Adjust scores to penalize complexity.
 *
 */
public class ComplexityAdjustedScore implements AdjustScore {

	/**
	 * The starting complexity penalty.
	 */
	private double complexityPenalty = .2;

	/**
	 * The full complexity penalty.
	 */
	private double complexityFullPenalty = 2.0;

	/**
	 * The complexity level at which a penalty begins to be applied.
	 */
	private int complexityPenaltyThreshold = 10;

	/**
	 * The complexity level at which a full (100%) penalty is applied.
	 */
	private int complexityPentaltyFullThreshold = 50;

	/**
	 * Construct a adjustor to penalize complexity.
	 * @param theComplexityPenaltyThreshold The complexity level at which a penalty begins to be applied.
	 * @param theComplexityPentaltyFullThreshold The complexity level at which a full (100%) penalty is applied.
	 * @param theComplexityPenalty The starting complexity penalty.
	 * @param theComplexityFullPenalty The full complexity penalty.
	 */
	public ComplexityAdjustedScore(int theComplexityPenaltyThreshold,
			int theComplexityPentaltyFullThreshold,
			double theComplexityPenalty, double theComplexityFullPenalty) {
		this.complexityPenaltyThreshold = theComplexityPenaltyThreshold;
		this.complexityPentaltyFullThreshold = theComplexityPentaltyFullThreshold;
		this.complexityPenalty = theComplexityPenalty;
		this.complexityFullPenalty = theComplexityFullPenalty;
	}
	
	public ComplexityAdjustedScore() {
		this(10,50,0.2,2.0);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public double calculateAdjustment(Genome genome) {
		double score = genome.getScore();
		double result = 0;

		if (genome.size() > this.complexityPenaltyThreshold) {
			int over = genome.size() - this.complexityPenaltyThreshold;
			int range = this.complexityPentaltyFullThreshold
					- this.complexityPenaltyThreshold;
			double complexityPenalty = ((this.complexityFullPenalty - this.complexityPenalty) / range)
					* over;
			result = (score * complexityPenalty);
		}

		return result;
	}

	/**
	 * @return the complexityPenalty
	 */
	public double getComplexityPenalty() {
		return complexityPenalty;
	}

	/**
	 * @param complexityPenalty the complexityPenalty to set
	 */
	public void setComplexityPenalty(double complexityPenalty) {
		this.complexityPenalty = complexityPenalty;
	}

	/**
	 * @return the complexityFullPenalty
	 */
	public double getComplexityFullPenalty() {
		return complexityFullPenalty;
	}

	/**
	 * @param complexityFullPenalty the complexityFullPenalty to set
	 */
	public void setComplexityFullPenalty(double complexityFullPenalty) {
		this.complexityFullPenalty = complexityFullPenalty;
	}

	/**
	 * @return the complexityPenaltyThreshold
	 */
	public int getComplexityPenaltyThreshold() {
		return complexityPenaltyThreshold;
	}

	/**
	 * @param complexityPenaltyThreshold the complexityPenaltyThreshold to set
	 */
	public void setComplexityPenaltyThreshold(int complexityPenaltyThreshold) {
		this.complexityPenaltyThreshold = complexityPenaltyThreshold;
	}

	/**
	 * @return the complexityPentaltyFullThreshold
	 */
	public int getComplexityPentaltyFullThreshold() {
		return complexityPentaltyFullThreshold;
	}

	/**
	 * @param complexityPentaltyFullThreshold the complexityPentaltyFullThreshold to set
	 */
	public void setComplexityPentaltyFullThreshold(
			int complexityPentaltyFullThreshold) {
		this.complexityPentaltyFullThreshold = complexityPentaltyFullThreshold;
	}
	
	
}