Package jsprit.examples

Source Code of jsprit.examples.ComputationalExperiments_alphaSenstivity

/*******************************************************************************
* Copyright (C) 2014  Stefan Schroeder
*
* This library 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 3.0 of the License, or (at your option) any later version.
*
* This library 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 library.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
package jsprit.examples;

import jsprit.analysis.toolbox.ComputationalLaboratory;
import jsprit.analysis.toolbox.ComputationalLaboratory.CalculationListener;
import jsprit.analysis.toolbox.ComputationalLaboratory.DataCollector;
import jsprit.analysis.toolbox.Plotter;
import jsprit.analysis.toolbox.XYLineChartBuilder;
import jsprit.core.algorithm.VehicleRoutingAlgorithm;
import jsprit.core.algorithm.VehicleRoutingAlgorithmFactory;
import jsprit.core.algorithm.io.AlgorithmConfig;
import jsprit.core.algorithm.io.VehicleRoutingAlgorithms;
import jsprit.core.algorithm.listener.IterationStartsListener;
import jsprit.core.problem.VehicleRoutingProblem;
import jsprit.core.problem.solution.VehicleRoutingProblemSolution;
import jsprit.core.reporting.SolutionPrinter;
import jsprit.core.reporting.SolutionPrinter.Print;
import jsprit.core.util.BenchmarkInstance;
import jsprit.core.util.Solutions;
import jsprit.instance.reader.SolomonReader;
import jsprit.util.Examples;
import org.apache.commons.configuration.XMLConfiguration;

import java.util.Collection;

/**
* Based on Solomon's R101 instance
*
* @author schroeder
*
*/
public class ComputationalExperiments_alphaSenstivity {
 
 
  public static void main(String[] args) {
    /*
     * some preparation - create output folder
     */
    Examples.createOutputFolder();
   
    /*
     * Build the problem.
     *
     * But define a problem-builder first.
     */
    VehicleRoutingProblem.Builder vrpBuilder = VehicleRoutingProblem.Builder.newInstance();
   
    /*
     * A solomonReader reads solomon-instance files, and stores the required information in the builder.
     */
    new SolomonReader(vrpBuilder,100).read("input/R101.txt");
   
    /*
     * Finally, the problem can be built. By default, transportCosts are crowFlyDistances (as usually used for vrp-instances).
     */
    VehicleRoutingProblem vrp = vrpBuilder.build();
   
    /*
     * Create ComputationalLaboratory
     */
    ComputationalLaboratory computationalLab = new ComputationalLaboratory();
    /*
     * add benchmarking instance
     */
    computationalLab.addInstance("SolomonR101", vrp);
    /*
     * add algorithms through factories
     *
     *
     *
     */
    for(double alphaVal=0.;alphaVal<.4;alphaVal+=.1){
     
      final String alpha = String.valueOf(alphaVal).substring(0, 3);
      computationalLab.addAlgorithmFactory("alpha_"+alpha, new VehicleRoutingAlgorithmFactory() {

        @Override
        public VehicleRoutingAlgorithm createAlgorithm(VehicleRoutingProblem vrp) {
          return VehicleRoutingAlgorithms.createAlgorithm(vrp, getAlgorithmConfig(alpha));
        }
       
      });
     
    }
       
    /*
     * plot search progress of different algorithms
     */
    final XYLineChartBuilder chartBuilder = XYLineChartBuilder.newInstance("alpha-sensitivity", "iterations", "costs");
    computationalLab.addListener(new CalculationListener() {
     
      @Override
      public void calculationStarts(BenchmarkInstance p, final String algorithmName,VehicleRoutingAlgorithm algorithm, int run) {
        algorithm.addListener(new IterationStartsListener() {
         
          @Override
          public void informIterationStarts(int i, VehicleRoutingProblem problem,Collection<VehicleRoutingProblemSolution> solutions) {
            /*
             * plot only distance-costs, i.e. without fixed costs
             */
            VehicleRoutingProblemSolution bestOf = Solutions.bestOf(solutions);
            chartBuilder.addData(algorithmName, i, bestOf.getCost()-bestOf.getRoutes().size()*100.);
          }
         
        });
       
      }
     
      @Override
      public void calculationEnds(BenchmarkInstance p, String algorithmName,VehicleRoutingAlgorithm algorithm, int run,Collection<VehicleRoutingProblemSolution> solutions) {}
     
    });
    /*
     * define dataCollector to collect an arbitrary number of indicators as well as solutions
     */
    final DataCollector dataCollector = new DataCollector();
    computationalLab.addListener(new CalculationListener() {
     
      @Override
      public void calculationStarts(BenchmarkInstance p, String algorithmName,VehicleRoutingAlgorithm algorithm, int run) {}
     
      @Override
      public void calculationEnds(BenchmarkInstance p, String algorithmName,VehicleRoutingAlgorithm algorithm, int run,Collection<VehicleRoutingProblemSolution> solutions) {
        //memorize solution
        dataCollector.addSolution(p.name, algorithmName, run, Solutions.bestOf(solutions));
      }
     
    });
    /*
     * determine number of threads to be used
     */
    computationalLab.setThreads(2);
    /*
     * run the experiments
     */
    computationalLab.run();
   
    /*
     * plot the lineChart
     */
    XYLineChartBuilder.saveChartAsPNG(chartBuilder.build(), "output/computationalStudies_alphaSensitivity.png");
   
    /*
     * print best solution
     */
    SolutionPrinter.print(vrp, Solutions.bestOf(dataCollector.getSolutions()), Print.VERBOSE);
   
    /*
     * plot best
     */
    Plotter plotter = new Plotter(vrp,Solutions.bestOf(dataCollector.getSolutions()));
    plotter.plot("output/bestOf.png", "bestOfR101");
   
  }
 
  private static AlgorithmConfig getAlgorithmConfig(String alpha) {
    AlgorithmConfig config = new AlgorithmConfig();
    XMLConfiguration xmlConfig = config.getXMLConfiguration();
    xmlConfig.setProperty("iterations",10000);
    xmlConfig.setProperty("construction.insertion[@name]","bestInsertion");
   
    xmlConfig.setProperty("strategy.memory", 1);
    String searchStrategy = "strategy.searchStrategies.searchStrategy";
   
    xmlConfig.setProperty(searchStrategy + "(0).selector[@name]","selectBest");
    xmlConfig.setProperty(searchStrategy + "(0).acceptor[@name]","schrimpfAcceptance");
    xmlConfig.setProperty(searchStrategy + "(0).acceptor.alpha",alpha);
    xmlConfig.setProperty(searchStrategy + "(0).acceptor.warmup","50");
    xmlConfig.setProperty(searchStrategy + "(0).modules.module(0)[@name]","ruin_and_recreate");
    xmlConfig.setProperty(searchStrategy + "(0).modules.module(0).ruin[@name]","randomRuin");
    xmlConfig.setProperty(searchStrategy + "(0).modules.module(0).ruin.share","0.3");
    xmlConfig.setProperty(searchStrategy + "(0).modules.module(0).insertion[@name]","bestInsertion");
    xmlConfig.setProperty(searchStrategy + "(0).probability",".5");
   
    xmlConfig.setProperty(searchStrategy + "(1).selector[@name]","selectBest");
    xmlConfig.setProperty(searchStrategy + "(1).acceptor[@name]","schrimpfAcceptance");
    xmlConfig.setProperty(searchStrategy + "(1).modules.module(0)[@name]","ruin_and_recreate");
    xmlConfig.setProperty(searchStrategy + "(1).modules.module(0).ruin[@name]","radialRuin");
    xmlConfig.setProperty(searchStrategy + "(1).modules.module(0).ruin.share","0.1");
    xmlConfig.setProperty(searchStrategy + "(1).modules.module(0).insertion[@name]","bestInsertion");
    xmlConfig.setProperty(searchStrategy + "(1).probability","0.5");
   
    return config;
  }

}
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