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add and test new ruin strategy: RuinWorst
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oblonski
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3 changed files with 375 additions and 0 deletions
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/*******************************************************************************
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* Copyright (C) 2014 Stefan Schroeder
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3.0 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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package jsprit.core.algorithm.ruin;
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import jsprit.core.problem.VehicleRoutingProblem;
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import jsprit.core.problem.driver.DriverImpl;
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import jsprit.core.problem.job.Job;
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import jsprit.core.problem.solution.route.VehicleRoute;
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import jsprit.core.problem.solution.route.activity.TourActivity;
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import jsprit.core.problem.vehicle.Vehicle;
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import jsprit.core.util.NoiseMaker;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import java.util.*;
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/**
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* Ruin strategy that ruins current solution randomly. I.e.
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* customer are removed randomly from current solution.
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*
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* @author stefan schroeder
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*
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*/
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public final class RuinWorst extends AbstractRuinStrategy {
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private Logger logger = LogManager.getLogger(RuinWorst.class);
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private VehicleRoutingProblem vrp;
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private NoiseMaker noiseMaker = new NoiseMaker(){
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@Override
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public double makeNoise() {
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return 0;
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}
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};
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public void setNoiseMaker(NoiseMaker noiseMaker) {
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this.noiseMaker = noiseMaker;
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}
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public RuinWorst(VehicleRoutingProblem vrp, final int initialNumberJobsToRemove) {
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super();
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this.vrp = vrp;
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setRuinShareFactory(new RuinShareFactory() {
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@Override
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public int createNumberToBeRemoved() {
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return initialNumberJobsToRemove;
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}
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});
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logger.info("initialise " + this);
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logger.info("done");
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}
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/**
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* Removes a fraction of jobs from vehicleRoutes.
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*
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* <p>The number of jobs is calculated as follows: Math.ceil(vrp.getJobs().values().size() * fractionOfAllNodes2beRuined).
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*/
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@Override
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public Collection<Job> ruinRoutes(Collection<VehicleRoute> vehicleRoutes) {
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List<Job> unassignedJobs = new ArrayList<Job>();
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int nOfJobs2BeRemoved = getRuinShareFactory().createNumberToBeRemoved();
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ruin(vehicleRoutes, nOfJobs2BeRemoved, unassignedJobs);
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return unassignedJobs;
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}
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/**
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* Removes nOfJobs2BeRemoved from vehicleRoutes, including targetJob.
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*/
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@Override
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public Collection<Job> ruinRoutes(Collection<VehicleRoute> vehicleRoutes, Job targetJob, int nOfJobs2BeRemoved) {
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throw new UnsupportedOperationException("ruinRoutes not supported");
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}
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private void ruin(Collection<VehicleRoute> vehicleRoutes, int nOfJobs2BeRemoved, List<Job> unassignedJobs) {
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LinkedList<Job> availableJobs = new LinkedList<Job>(vrp.getJobs().values());
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int toRemove = nOfJobs2BeRemoved;
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while(toRemove > 0){
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Job worst = getWorst(vehicleRoutes);
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if(worst == null) break;
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removeJob(worst,vehicleRoutes);
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availableJobs.remove(worst);
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unassignedJobs.add(worst);
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toRemove--;
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}
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}
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private Job getWorst(Collection<VehicleRoute> copied) {
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Job worst = null;
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double bestSavings = Double.MIN_VALUE;
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for(VehicleRoute route : copied) {
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if(route.isEmpty()) continue;
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Map<Job,Double> savingsMap = new HashMap<Job,Double>();
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TourActivity actBefore = route.getStart();
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TourActivity actToEval = null;
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for (TourActivity act : route.getActivities()) {
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if (actToEval == null) {
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actToEval = act;
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continue;
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}
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double savings = savings(route, actBefore, actToEval, act);
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Job job = ((TourActivity.JobActivity) actToEval).getJob();
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if(!savingsMap.containsKey(job)){
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savingsMap.put(job,savings);
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}
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else {
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double s = savingsMap.get(job);
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savingsMap.put(job,s+savings);
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}
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actBefore = actToEval;
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actToEval = act;
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}
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double savings = savings(route, actBefore, actToEval, route.getEnd());
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Job job = ((TourActivity.JobActivity) actToEval).getJob();
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if(!savingsMap.containsKey(job)){
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savingsMap.put(job,savings);
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}
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else {
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double s = savingsMap.get(job);
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savingsMap.put(job,s+savings);
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}
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//getCounts best
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for(Job j : savingsMap.keySet()){
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if(savingsMap.get(j) > bestSavings){
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bestSavings = savingsMap.get(j);
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worst = j;
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}
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}
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}
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return worst;
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}
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private double savings(VehicleRoute route, TourActivity actBefore, TourActivity actToEval, TourActivity act) {
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double savings = c(actBefore, actToEval, route.getVehicle()) + c(actToEval, act, route.getVehicle()) - c(actBefore, act, route.getVehicle());
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return Math.max(0,savings + noiseMaker.makeNoise());
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}
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private double c(TourActivity from, TourActivity to, Vehicle vehicle) {
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return vrp.getTransportCosts().getTransportCost(from.getLocation(),to.getLocation(),from.getEndTime(), DriverImpl.noDriver(), vehicle);
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}
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@Override
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public String toString() {
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return "[name=worstRuin]";
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}
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}
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10
jsprit-core/src/main/java/jsprit/core/util/NoiseMaker.java
Normal file
10
jsprit-core/src/main/java/jsprit/core/util/NoiseMaker.java
Normal file
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package jsprit.core.util;
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/**
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* Created by schroeder on 16/01/15.
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*/
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public interface NoiseMaker {
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public double makeNoise();
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}
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package jsprit.core.algorithm.ruin;
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import jsprit.core.problem.Location;
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import jsprit.core.problem.VehicleRoutingProblem;
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import jsprit.core.problem.job.Job;
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import jsprit.core.problem.job.Service;
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import jsprit.core.problem.job.Shipment;
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import jsprit.core.problem.solution.route.VehicleRoute;
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import jsprit.core.problem.vehicle.VehicleImpl;
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import jsprit.core.util.Coordinate;
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import org.junit.Test;
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import java.util.Arrays;
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import java.util.Collection;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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/**
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* Created by schroeder on 30/01/15.
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*/
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public class RuinWorstTest {
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@Test
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public void itShouldRemoveCorrectNumber(){
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Service s1 = Service.Builder.newInstance("s1")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(1, 1)).build()).build();
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Service s2 = Service.Builder.newInstance("s2")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(3, 1)).build()).build();
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Service s3 = Service.Builder.newInstance("s3")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(10, 10)).build()).build();
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VehicleImpl v = VehicleImpl.Builder.newInstance("v")
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.setStartLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(0, 0)).build()).build();
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VehicleRoutingProblem vrp = VehicleRoutingProblem.Builder.newInstance().addJob(s1).addJob(s2).addJob(s3).addVehicle(v).build();
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RuinWorst worst = new RuinWorst(vrp,1);
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VehicleRoute route = VehicleRoute.Builder.newInstance(v).addService(s1).addService(s2).addService(s3).setJobActivityFactory(vrp.getJobActivityFactory()).build();
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Collection<Job> unassigned = worst.ruinRoutes(Arrays.asList(route));
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assertEquals(1,unassigned.size());
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}
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@Test
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public void itShouldRemoveWorst(){
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Service s1 = Service.Builder.newInstance("s1")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(1, 1)).build()).build();
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Service s2 = Service.Builder.newInstance("s2")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(3, 1)).build()).build();
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Service s3 = Service.Builder.newInstance("s3")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(10, 10)).build()).build();
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VehicleImpl v = VehicleImpl.Builder.newInstance("v")
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.setStartLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(0, 0)).build()).build();
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VehicleRoutingProblem vrp = VehicleRoutingProblem.Builder.newInstance().addJob(s1).addJob(s2).addJob(s3).addVehicle(v).build();
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RuinWorst worst = new RuinWorst(vrp,1);
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VehicleRoute route = VehicleRoute.Builder.newInstance(v).addService(s1).addService(s2).addService(s3).setJobActivityFactory(vrp.getJobActivityFactory()).build();
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Collection<Job> unassigned = worst.ruinRoutes(Arrays.asList(route));
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assertEquals(s3,unassigned.iterator().next());
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}
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@Test
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public void itShouldRemoveWorstTwo(){
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Service s1 = Service.Builder.newInstance("s1")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(1, 1)).build()).build();
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Service s2 = Service.Builder.newInstance("s2")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(3, 1)).build()).build();
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Service s3 = Service.Builder.newInstance("s3")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(10, 10)).build()).build();
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VehicleImpl v = VehicleImpl.Builder.newInstance("v")
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.setStartLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(0, 0)).build()).build();
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VehicleRoutingProblem vrp = VehicleRoutingProblem.Builder.newInstance().addJob(s1).addJob(s2).addJob(s3).addVehicle(v).build();
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RuinWorst worst = new RuinWorst(vrp,1);
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worst.setRuinShareFactory(new RuinShareFactory() {
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@Override
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public int createNumberToBeRemoved() {
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return 2;
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}
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});
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VehicleRoute route = VehicleRoute.Builder.newInstance(v).addService(s1).addService(s2).addService(s3).setJobActivityFactory(vrp.getJobActivityFactory()).build();
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Collection<Job> unassigned = worst.ruinRoutes(Arrays.asList(route));
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assertTrue(unassigned.size() == 2);
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assertTrue(unassigned.contains(s2));
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assertTrue(unassigned.contains(s3));
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}
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@Test
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public void itShouldRemoveShipment(){
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Service s1 = Service.Builder.newInstance("s1")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(1, 1)).build()).build();
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Service s2 = Service.Builder.newInstance("s2")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(3, 1)).build()).build();
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Service s3 = Service.Builder.newInstance("s3")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(10, 10)).build()).build();
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Shipment shipment = Shipment.Builder.newInstance("ship1")
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.setPickupLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(2, 2)).build())
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.setDeliveryLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(9, 9)).build()).build();
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VehicleImpl v = VehicleImpl.Builder.newInstance("v")
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.setStartLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(0, 0)).build()).build();
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VehicleRoutingProblem vrp = VehicleRoutingProblem.Builder.newInstance()
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.addJob(shipment).addJob(s1).addJob(s2).addJob(s3).addVehicle(v).build();
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RuinWorst worst = new RuinWorst(vrp,1);
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worst.setRuinShareFactory(new RuinShareFactory() {
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@Override
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public int createNumberToBeRemoved() {
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return 1;
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}
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});
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VehicleRoute route = VehicleRoute.Builder.newInstance(v)
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.addPickup(shipment).addService(s1).addService(s2).addService(s3).addDelivery(shipment)
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.setJobActivityFactory(vrp.getJobActivityFactory()).build();
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Collection<Job> unassigned = worst.ruinRoutes(Arrays.asList(route));
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assertTrue(unassigned.size() == 1);
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assertTrue(unassigned.contains(shipment));
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}
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@Test
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public void itShouldRemoveShipmentFromSecondRoute(){
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Service s1 = Service.Builder.newInstance("s1")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(1, 1)).build()).build();
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Service s2 = Service.Builder.newInstance("s2")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(3, 1)).build()).build();
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Service s3 = Service.Builder.newInstance("s3")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(10, 10)).build()).build();
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Shipment shipment = Shipment.Builder.newInstance("ship1")
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.setPickupLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(3, 1)).build())
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.setDeliveryLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(10, 10.1)).build()).build();
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VehicleImpl v = VehicleImpl.Builder.newInstance("v")
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.setStartLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(0, 0)).build()).build();
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VehicleImpl v2 = VehicleImpl.Builder.newInstance("v2")
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.setStartLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(0, 0)).build()).build();
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VehicleRoutingProblem vrp = VehicleRoutingProblem.Builder.newInstance()
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.addJob(shipment).addJob(s1).addJob(s2).addJob(s3).addVehicle(v).addVehicle(v2).build();
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RuinWorst worst = new RuinWorst(vrp,1);
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worst.setRuinShareFactory(new RuinShareFactory() {
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@Override
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public int createNumberToBeRemoved() {
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return 1;
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}
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});
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VehicleRoute route1 = VehicleRoute.Builder.newInstance(v)
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.addService(s1).addService(s2).addService(s3)
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.setJobActivityFactory(vrp.getJobActivityFactory()).build();
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VehicleRoute route2 = VehicleRoute.Builder.newInstance(v2)
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.addPickup(shipment).addDelivery(shipment).build();
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Collection<Job> unassigned = worst.ruinRoutes(Arrays.asList(route1,route2));
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assertTrue(unassigned.size() == 1);
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assertTrue(unassigned.contains(shipment));
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}
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@Test
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public void itShouldRemoveServiceAndShipmentFromSecondRoute(){
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Service s1 = Service.Builder.newInstance("s1")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(1, 1)).build()).build();
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Service s2 = Service.Builder.newInstance("s2")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(3, 1)).build()).build();
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Service s3 = Service.Builder.newInstance("s3")
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.setLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(10, 10)).build()).build();
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Shipment shipment = Shipment.Builder.newInstance("ship1")
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.setPickupLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(3, 1)).build())
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.setDeliveryLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(10, 10.1)).build()).build();
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VehicleImpl v = VehicleImpl.Builder.newInstance("v")
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.setStartLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(0, 0)).build()).build();
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VehicleImpl v2 = VehicleImpl.Builder.newInstance("v2")
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.setStartLocation(Location.Builder.newInstance().setCoordinate(Coordinate.newInstance(0, 0)).build()).build();
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VehicleRoutingProblem vrp = VehicleRoutingProblem.Builder.newInstance()
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.addJob(shipment).addJob(s1).addJob(s2).addJob(s3).addVehicle(v).addVehicle(v2).build();
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RuinWorst worst = new RuinWorst(vrp,1);
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worst.setRuinShareFactory(new RuinShareFactory() {
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@Override
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public int createNumberToBeRemoved() {
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return 2;
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}
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});
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VehicleRoute route1 = VehicleRoute.Builder.newInstance(v)
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.addService(s1).addService(s2).addService(s3)
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.setJobActivityFactory(vrp.getJobActivityFactory()).build();
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VehicleRoute route2 = VehicleRoute.Builder.newInstance(v2)
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.addPickup(shipment).addDelivery(shipment).build();
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Collection<Job> unassigned = worst.ruinRoutes(Arrays.asList(route1,route2));
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assertTrue(unassigned.size() == 2);
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assertTrue(unassigned.contains(shipment));
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assertTrue(unassigned.contains(s3));
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}
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}
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