NSGAIIIRunner.java

//  NSGAIIIRunner.java
//
//  Author:
//       Antonio J. Nebro <antonio@lcc.uma.es>
//
//  Copyright (c) 2014 Antonio J. Nebro
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
// 
//  You should have received a copy of the GNU Lesser General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.

package org.uma.jmetal.runner.multiobjective;

import org.uma.jmetal.algorithm.Algorithm;
import org.uma.jmetal.algorithm.multiobjective.nsgaiii.NSGAIIIBuilder;
import org.uma.jmetal.operator.CrossoverOperator;
import org.uma.jmetal.operator.MutationOperator;
import org.uma.jmetal.operator.SelectionOperator;
import org.uma.jmetal.operator.impl.crossover.SBXCrossover;
import org.uma.jmetal.operator.impl.mutation.PolynomialMutation;
import org.uma.jmetal.operator.impl.selection.BinaryTournamentSelection;
import org.uma.jmetal.problem.Problem;
import org.uma.jmetal.runner.AbstractAlgorithmRunner;
import org.uma.jmetal.solution.DoubleSolution;
import org.uma.jmetal.util.AlgorithmRunner;
import org.uma.jmetal.util.JMetalException;
import org.uma.jmetal.util.JMetalLogger;
import org.uma.jmetal.util.ProblemUtils;
import org.uma.jmetal.util.fileoutput.SolutionListOutput;
import org.uma.jmetal.util.fileoutput.impl.DefaultFileOutputContext;

import java.util.List;

/**
 * Class to configure and run the NSGA-III algorithm
 */
public class NSGAIIIRunner extends AbstractAlgorithmRunner {
  /**
   * @param args Command line arguments.
   * @throws java.io.IOException
   * @throws SecurityException
   * @throws ClassNotFoundException
   * Usage: three options
   *        - org.uma.jmetal.runner.multiobjective.NSGAIIIRunner
   *        - org.uma.jmetal.runner.multiobjective.NSGAIIIRunner problemName
   *        - org.uma.jmetal.runner.multiobjective.NSGAIIIRunner problemName paretoFrontFile
   */
  public static void main(String[] args) throws JMetalException {
	    Problem<DoubleSolution> problem;
	    Algorithm<List<DoubleSolution>> algorithm;
	    CrossoverOperator<DoubleSolution> crossover;
	    MutationOperator<DoubleSolution> mutation;
	    SelectionOperator<List<DoubleSolution>, DoubleSolution> selection;

    String problemName = "org.uma.jmetal.problem.multiobjective.dtlz.DTLZ1" ;

    problem = ProblemUtils.loadProblem(problemName);
    
    double crossoverProbability = 0.9 ;
    double crossoverDistributionIndex = 30.0 ;
    crossover = new SBXCrossover(crossoverProbability, crossoverDistributionIndex) ;

    double mutationProbability = 1.0 / problem.getNumberOfVariables() ;
    double mutationDistributionIndex = 20.0 ;
    mutation = new PolynomialMutation(mutationProbability, mutationDistributionIndex) ;
    
    selection = new BinaryTournamentSelection<DoubleSolution>();
    
    algorithm = new NSGAIIIBuilder<>(problem)
            .setCrossoverOperator(crossover)
            .setMutationOperator(mutation)
            .setSelectionOperator(selection)
            .setMaxIterations(500)
            .build() ;

    AlgorithmRunner algorithmRunner = new AlgorithmRunner.Executor(algorithm)
            .execute() ;

    List<DoubleSolution> population = algorithm.getResult() ;
    long computingTime = algorithmRunner.getComputingTime() ;

    new SolutionListOutput(population)
            .setSeparator("\t")
            .setVarFileOutputContext(new DefaultFileOutputContext("VAR.tsv"))
            .setFunFileOutputContext(new DefaultFileOutputContext("FUN.tsv"))
            .print() ;

    JMetalLogger.logger.info("Total execution time: " + computingTime + "ms");
    JMetalLogger.logger.info("Objectives values have been written to file FUN.tsv");
    JMetalLogger.logger.info("Variables values have been written to file VAR.tsv");
  }
}