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https://github.com/graphhopper/jsprit.git
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add bad job list
This commit is contained in:
parent
632a889c4b
commit
62331ccfd9
15 changed files with 167 additions and 117 deletions
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@ -93,6 +93,7 @@ public class SolutionPrinter {
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System.out.format("+---------------+------------------------------------------+%n");
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System.out.format(leftAlignSolution, "costs",solution.getCost());
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System.out.format(leftAlignSolution, "nVehicles",solution.getRoutes().size());
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System.out.format(leftAlignSolution, "badJobs", solution.getBadJobs().size());
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System.out.format("+----------------------------------------------------------+%n");
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if(print.equals(Print.VERBOSE)){
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@ -130,6 +131,10 @@ public class SolutionPrinter {
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}
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System.out.format("+*:=PenaltyVehicle+%n");
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System.out.format("+--------------------------------------------------------------------------------------------------------------------------------+%n");
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System.out.format("+*:=badJobs+%n");
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for(Job j : solution.getBadJobs()){
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System.out.println(j.getId());
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}
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}
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private static String getVehicleString(VehicleRoute route) {
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@ -29,6 +29,7 @@ import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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@ -51,8 +52,8 @@ public final class InsertionInitialSolutionFactory implements InitialSolutionFac
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logger.info("create initial solution.");
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List<VehicleRoute> vehicleRoutes = new ArrayList<VehicleRoute>();
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vehicleRoutes.addAll(vrp.getInitialVehicleRoutes());
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insertion.insertJobs(vehicleRoutes, getUnassignedJobs(vrp));
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VehicleRoutingProblemSolution solution = new VehicleRoutingProblemSolution(vehicleRoutes, Double.MAX_VALUE);
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Collection<Job> badJobs = insertion.insertJobs(vehicleRoutes, getUnassignedJobs(vrp));
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VehicleRoutingProblemSolution solution = new VehicleRoutingProblemSolution(vehicleRoutes, badJobs, Double.MAX_VALUE);
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double costs = solutionCostsCalculator.getCosts(solution);
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solution.setCost(costs);
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logger.info("creation done");
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@ -117,6 +117,7 @@ public class SearchStrategy {
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* @param vrp the underlying vehicle routing problem
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* @param solutions which will be modified
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* @return discoveredSolution
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* @throws java.lang.IllegalStateException if selector cannot select any solution
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*/
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@SuppressWarnings("UnusedParameters")
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public DiscoveredSolution run(VehicleRoutingProblem vrp, Collection<VehicleRoutingProblemSolution> solutions){
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@ -16,15 +16,15 @@
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******************************************************************************/
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package jsprit.core.algorithm;
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import jsprit.core.algorithm.listener.SearchStrategyListener;
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import jsprit.core.algorithm.listener.SearchStrategyModuleListener;
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import jsprit.core.util.RandomNumberGeneration;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.Random;
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import jsprit.core.algorithm.listener.SearchStrategyListener;
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import jsprit.core.algorithm.listener.SearchStrategyModuleListener;
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import jsprit.core.util.RandomNumberGeneration;
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public class SearchStrategyManager {
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@ -55,8 +55,9 @@ public class SearchStrategyManager {
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/**
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* adds a new search strategy. the probability must be within [0,1].
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* @param strategy
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* @param probability
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* @param strategy strategy to be added
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* @param probability probability of corresponding strategy to be added
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* @throws java.lang.IllegalStateException if strategy is null OR prob > 1. OR prob < 0.
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*/
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public void addStrategy(SearchStrategy strategy, double probability){
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if(strategy == null){
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@ -76,6 +77,12 @@ public class SearchStrategyManager {
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}
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}
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/**
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* Returns search strategy that has been randomly selected.
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*
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* @return selected search strategy
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* @throws java.lang.IllegalStateException if randomNumberGenerator is null OR no search strategy can be found
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*/
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public SearchStrategy getRandomStrategy() {
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if(random == null) throw new IllegalStateException("randomizer is null. make sure you set random object correctly");
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double randomFig = random.nextDouble();
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@ -23,6 +23,7 @@ import jsprit.core.problem.solution.SolutionCostCalculator;
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import jsprit.core.problem.solution.VehicleRoutingProblemSolution;
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import jsprit.core.problem.solution.route.VehicleRoute;
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import jsprit.core.problem.solution.route.state.RouteAndActivityStateGetter;
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import jsprit.core.problem.vehicle.Vehicle;
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/**
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* Default objective function which is the sum of all fixed vehicle and variable
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@ -49,10 +50,17 @@ public class VariablePlusFixedSolutionCostCalculatorFactory {
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double c = 0.0;
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for(VehicleRoute r : solution.getRoutes()){
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c += stateManager.getRouteState(r, InternalStates.COSTS, Double.class);
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c += r.getVehicle().getType().getVehicleCostParams().fix;
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c += getFixedCosts(r.getVehicle());
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}
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c += solution.getBadJobs().size() * c * .1;
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return c;
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}
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private double getFixedCosts(Vehicle vehicle) {
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if(vehicle == null) return 0.0;
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if(vehicle.getType() == null) return 0.0;
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return vehicle.getType().getVehicleCostParams().fix;
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}
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};
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}
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@ -16,10 +16,10 @@
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******************************************************************************/
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package jsprit.core.algorithm.acceptor;
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import java.util.Collection;
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import jsprit.core.problem.solution.VehicleRoutingProblemSolution;
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import java.util.Collection;
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public class GreedyAcceptance implements SolutionAcceptor{
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@ -48,12 +48,6 @@ public class GreedyAcceptance implements SolutionAcceptor{
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if (worstSolution == null) worstSolution = s;
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else if (s.getCost() > worstSolution.getCost()) worstSolution = s;
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}
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// if(newSolution.getRoutes().size() < worstSolution.getRoutes().size()){
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// solutions.remove(worstSolution);
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// solutions.add(newSolution);
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// solutionAccepted = true;
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// }
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// else
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if(newSolution.getCost() < worstSolution.getCost()){
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solutions.remove(worstSolution);
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solutions.add(newSolution);
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@ -620,24 +620,7 @@ public class VehicleRoutingAlgorithms {
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}
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private static SolutionCostCalculator getDefaultCostCalculator(final StateManager stateManager) {
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SolutionCostCalculator calc = new SolutionCostCalculator() {
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@Override
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public double getCosts(VehicleRoutingProblemSolution solution) {
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double costs = 0.0;
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for(VehicleRoute route : solution.getRoutes()){
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costs += stateManager.getRouteState(route, InternalStates.COSTS, Double.class) + getFixedCosts(route.getVehicle());
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}
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return costs;
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}
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private double getFixedCosts(Vehicle vehicle) {
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if(vehicle == null) return 0.0;
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if(vehicle.getType() == null) return 0.0;
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return vehicle.getType().getVehicleCostParams().fix;
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}
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};
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return calc;
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return new VariablePlusFixedSolutionCostCalculatorFactory(stateManager).createCalculator();
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}
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private static VehicleFleetManager createFleetManager(final VehicleRoutingProblem vrp) {
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@ -16,8 +16,6 @@
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******************************************************************************/
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package jsprit.core.algorithm.module;
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import java.util.Collection;
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import jsprit.core.algorithm.SearchStrategyModule;
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import jsprit.core.algorithm.listener.SearchStrategyModuleListener;
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import jsprit.core.algorithm.recreate.InsertionStrategy;
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@ -27,6 +25,10 @@ import jsprit.core.algorithm.ruin.listener.RuinListener;
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import jsprit.core.problem.job.Job;
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import jsprit.core.problem.solution.VehicleRoutingProblemSolution;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Set;
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public class RuinAndRecreateModule implements SearchStrategyModule{
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@ -46,7 +48,12 @@ public class RuinAndRecreateModule implements SearchStrategyModule{
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@Override
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public VehicleRoutingProblemSolution runAndGetSolution(VehicleRoutingProblemSolution vrpSolution) {
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Collection<Job> ruinedJobs = ruin.ruin(vrpSolution.getRoutes());
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insertion.insertJobs(vrpSolution.getRoutes(), ruinedJobs);
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Set<Job> ruinedJobSet = new HashSet<Job>();
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ruinedJobSet.addAll(ruinedJobs);
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ruinedJobSet.addAll(vrpSolution.getBadJobs());
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Collection<Job> badJobs = insertion.insertJobs(vrpSolution.getRoutes(), ruinedJobSet);
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vrpSolution.getBadJobs().clear();
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vrpSolution.getBadJobs().addAll(badJobs);
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return vrpSolution;
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}
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@ -34,11 +34,11 @@ import java.util.*;
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/**
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* Best insertion that insert the job where additional costs are minimal.
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*
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* @author stefan schroeder
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*
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*/
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final class BestInsertion implements InsertionStrategy{
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class Insertion {
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@ -79,8 +79,6 @@ final class BestInsertion implements InsertionStrategy{
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private JobInsertionCostsCalculator bestInsertionCostCalculator;
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private boolean minVehiclesFirst = false;
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public void setRandom(Random random) {
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this.random = random;
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}
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@ -99,8 +97,9 @@ final class BestInsertion implements InsertionStrategy{
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}
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@Override
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public void insertJobs(Collection<VehicleRoute> vehicleRoutes, Collection<Job> unassignedJobs) {
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public Collection<Job> insertJobs(Collection<VehicleRoute> vehicleRoutes, Collection<Job> unassignedJobs) {
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insertionsListeners.informInsertionStarts(vehicleRoutes,unassignedJobs);
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List<Job> badJobs = new ArrayList<Job>(unassignedJobs.size());
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List<Job> unassignedJobList = new ArrayList<Job>(unassignedJobs);
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Collections.shuffle(unassignedJobList, random);
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for(Job unassignedJob : unassignedJobList){
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@ -116,38 +115,17 @@ final class BestInsertion implements InsertionStrategy{
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bestInsertionCost = iData.getInsertionCost();
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}
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}
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if(!minVehiclesFirst){
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VehicleRoute newRoute = VehicleRoute.emptyRoute();
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InsertionData newIData = bestInsertionCostCalculator.getInsertionData(newRoute, unassignedJob, NO_NEW_VEHICLE_YET, NO_NEW_DEPARTURE_TIME_YET, NO_NEW_DRIVER_YET, bestInsertionCost);
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if(newIData.getInsertionCost() < bestInsertionCost){
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bestInsertion = new Insertion(newRoute,newIData);
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vehicleRoutes.add(newRoute);
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}
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}
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if(bestInsertion == null){
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VehicleRoute newRoute = VehicleRoute.emptyRoute();
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InsertionData bestI = bestInsertionCostCalculator.getInsertionData(newRoute, unassignedJob, NO_NEW_VEHICLE_YET, NO_NEW_DEPARTURE_TIME_YET, NO_NEW_DRIVER_YET, Double.MAX_VALUE);
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if(bestI instanceof InsertionData.NoInsertionFound){
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throw new NoSolutionFoundException(getErrorMsg(unassignedJob));
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}
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else{
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bestInsertion = new Insertion(newRoute,bestI);
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vehicleRoutes.add(newRoute);
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}
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}
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// logger.info("insert " + unassignedJob + " pickup@" + bestInsertion.getInsertionData().getPickupInsertionIndex() + " delivery@" + bestInsertion.getInsertionData().getDeliveryInsertionIndex());
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inserter.insertJob(unassignedJob, bestInsertion.getInsertionData(), bestInsertion.getRoute());
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if(bestInsertion == null) badJobs.add(unassignedJob);
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else inserter.insertJob(unassignedJob, bestInsertion.getInsertionData(), bestInsertion.getRoute());
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}
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insertionsListeners.informInsertionEndsListeners(vehicleRoutes);
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}
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private String getErrorMsg(Job unassignedJob) {
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return "given the vehicles, could not insert job\n" +
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"\t" + unassignedJob +
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"\n\tthis might have the following reasons:\n" +
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"\t- no vehicle has the capacity to transport the job [check whether there is at least one vehicle that is capable to transport the job]\n" +
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"\t- the time-window cannot be met, even in a commuter tour the time-window is missed [check whether it is possible to reach the time-window on the shortest path or make hard time-windows soft]\n" +
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"\t- if you deal with finite vehicles, and the available vehicles are already fully employed, no vehicle can be found anymore to transport the job [add penalty-vehicles]";
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return badJobs;
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}
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@Override
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@ -114,7 +114,7 @@ final class BestInsertionConcurrent implements InsertionStrategy{
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}
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@Override
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public void insertJobs(Collection<VehicleRoute> vehicleRoutes, Collection<Job> unassignedJobs) {
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public Collection<Job> insertJobs(Collection<VehicleRoute> vehicleRoutes, Collection<Job> unassignedJobs) {
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insertionsListeners.informInsertionStarts(vehicleRoutes,unassignedJobs);
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List<Job> unassignedJobList = new ArrayList<Job>(unassignedJobs);
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Collections.shuffle(unassignedJobList, random);
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@ -184,6 +184,7 @@ final class BestInsertionConcurrent implements InsertionStrategy{
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inserter.insertJob(unassignedJob, bestInsertion.getInsertionData(), bestInsertion.getRoute());
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}
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insertionsListeners.informInsertionEndsListeners(vehicleRoutes);
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return null;
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}
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private String getErrorMsg(Job unassignedJob) {
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@ -16,17 +16,16 @@
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******************************************************************************/
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package jsprit.core.algorithm.recreate;
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import java.util.Collection;
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import jsprit.core.algorithm.recreate.listener.InsertionListener;
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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 java.util.Collection;
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/**
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* Basic interface for insertion strategies
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*
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* @author stefan schroeder
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*
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@ -35,12 +34,11 @@ import jsprit.core.problem.solution.route.VehicleRoute;
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public interface InsertionStrategy {
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/**
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* Assigns the unassigned jobs to service-providers
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*
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* @param vehicleRoutes
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* @param unassignedJobs
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* Inserts unassigned jobs into vehicle routes.
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* @param vehicleRoutes existing vehicle routes
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* @param unassignedJobs jobs to be inserted
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*/
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public void insertJobs(Collection<VehicleRoute> vehicleRoutes, Collection<Job> unassignedJobs);
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public Collection<Job> insertJobs(Collection<VehicleRoute> vehicleRoutes, Collection<Job> unassignedJobs);
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public void addListener(InsertionListener insertionListener);
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@ -16,11 +16,12 @@
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******************************************************************************/
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package jsprit.core.problem.solution;
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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 java.util.ArrayList;
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import java.util.Collection;
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import jsprit.core.problem.solution.route.VehicleRoute;
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/**
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* Contains the solution of a vehicle routing problem and its corresponding costs.
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@ -30,13 +31,11 @@ import jsprit.core.problem.solution.route.VehicleRoute;
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*/
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public class VehicleRoutingProblemSolution {
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public static double NO_COST_YET = -9999.0;
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/**
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* Makes a deep copy of the solution to be copied.
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*
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* @param solution2copy
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* @return
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* @param solution2copy solution to be copied
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* @return solution
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*/
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public static VehicleRoutingProblemSolution copyOf(VehicleRoutingProblemSolution solution2copy){
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return new VehicleRoutingProblemSolution(solution2copy);
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@ -44,6 +43,8 @@ public class VehicleRoutingProblemSolution {
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private final Collection<VehicleRoute> routes;
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private Collection<Job> badJobs = new ArrayList<Job>();
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private double cost;
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private VehicleRoutingProblemSolution(VehicleRoutingProblemSolution solution){
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@ -53,13 +54,14 @@ public class VehicleRoutingProblemSolution {
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routes.add(route);
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}
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this.cost = solution.getCost();
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badJobs.addAll(solution.getBadJobs());
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}
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/**
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* Constructs a solution with a number of {@link VehicleRoute}s and their corresponding aggregate cost value.
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*
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* @param routes
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* @param cost
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* @param routes routes being part of the solution
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* @param cost total costs of solution
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*/
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public VehicleRoutingProblemSolution(Collection<VehicleRoute> routes, double cost) {
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super();
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@ -67,6 +69,19 @@ public class VehicleRoutingProblemSolution {
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this.cost = cost;
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}
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/**
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* Constructs a solution with a number of {@link VehicleRoute}s, bad jobs and their corresponding aggregate cost value.
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*
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* @param routes routes being part of the solution
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* @param cost total costs of solution
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*/
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public VehicleRoutingProblemSolution(Collection<VehicleRoute> routes, Collection<Job> badJobs, double cost) {
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super();
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this.routes = routes;
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this.badJobs = badJobs;
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this.cost = cost;
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}
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/**
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* Returns a collection of vehicle-routes.
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*
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@ -88,10 +103,19 @@ public class VehicleRoutingProblemSolution {
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/**
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* Sets the costs of this solution.
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*
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* @param cost
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* @param cost the cost to assigned to this solution
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*/
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public void setCost(double cost){
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this.cost = cost;
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}
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/**
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* Returns bad jobs, i.e. jobs that are not assigned to any vehicle route.
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*
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* @return bad jobs
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*/
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public Collection<Job> getBadJobs(){
|
||||
return badJobs;
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -18,14 +18,17 @@
|
|||
******************************************************************************/
|
||||
package jsprit.core.problem.solution;
|
||||
|
||||
import jsprit.core.problem.job.Job;
|
||||
import jsprit.core.problem.solution.route.VehicleRoute;
|
||||
import org.junit.Test;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Arrays;
|
||||
import java.util.Collections;
|
||||
import java.util.List;
|
||||
|
||||
import jsprit.core.problem.solution.route.VehicleRoute;
|
||||
|
||||
import static org.junit.Assert.*;
|
||||
import static org.junit.Assert.assertEquals;
|
||||
import static org.mockito.Mockito.mock;
|
||||
import org.junit.Test;
|
||||
|
||||
public class VehicleRoutingProblemSolutionTest {
|
||||
|
||||
|
|
@ -51,4 +54,42 @@ public class VehicleRoutingProblemSolutionTest {
|
|||
assertEquals(20.0,sol.getCost(),0.01);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void sizeOfBadJobsShouldBeCorrect(){
|
||||
Job badJob = mock(Job.class);
|
||||
List<Job> badJobs = new ArrayList<Job>();
|
||||
badJobs.add(badJob);
|
||||
VehicleRoutingProblemSolution sol = new VehicleRoutingProblemSolution(Collections.<VehicleRoute>emptyList(), badJobs, 10.0);
|
||||
assertEquals(1,sol.getBadJobs().size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void sizeOfBadJobsShouldBeCorrect_2(){
|
||||
Job badJob = mock(Job.class);
|
||||
List<Job> badJobs = new ArrayList<Job>();
|
||||
badJobs.add(badJob);
|
||||
VehicleRoutingProblemSolution sol = new VehicleRoutingProblemSolution(Collections.<VehicleRoute>emptyList(), 10.0);
|
||||
sol.getBadJobs().addAll(badJobs);
|
||||
assertEquals(1, sol.getBadJobs().size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void badJobsShouldBeCorrect(){
|
||||
Job badJob = mock(Job.class);
|
||||
List<Job> badJobs = new ArrayList<Job>();
|
||||
badJobs.add(badJob);
|
||||
VehicleRoutingProblemSolution sol = new VehicleRoutingProblemSolution(Collections.<VehicleRoute>emptyList(), badJobs, 10.0);
|
||||
assertEquals(badJob,sol.getBadJobs().iterator().next());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void badJobsShouldBeCorrect_2() {
|
||||
Job badJob = mock(Job.class);
|
||||
List<Job> badJobs = new ArrayList<Job>();
|
||||
badJobs.add(badJob);
|
||||
VehicleRoutingProblemSolution sol = new VehicleRoutingProblemSolution(Collections.<VehicleRoute>emptyList(), 10.0);
|
||||
sol.getBadJobs().addAll(badJobs);
|
||||
assertEquals(badJob, sol.getBadJobs().iterator().next());
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -245,7 +245,7 @@ public class BicycleMessenger {
|
|||
VehicleRoutingTransportCosts routingCosts = new CrowFlyCosts(problemBuilder.getLocations()); //which is the default VehicleRoutingTransportCosts in builder above
|
||||
problemBuilder.setRoutingCost(routingCosts);
|
||||
//finally build the problem
|
||||
problemBuilder.addPenaltyVehicles(20.0,50000);
|
||||
// problemBuilder.addPenaltyVehicles(20.0,50000);
|
||||
VehicleRoutingProblem bicycleMessengerProblem = problemBuilder.build();
|
||||
|
||||
/*
|
||||
|
|
@ -272,10 +272,10 @@ public class BicycleMessenger {
|
|||
vraBuilder.addDefaultCostCalculators();
|
||||
vraBuilder.setStateAndConstraintManager(stateManager, constraintManager);
|
||||
VehicleRoutingAlgorithm algorithm = vraBuilder.build();
|
||||
algorithm.setNuOfIterations(2000);
|
||||
algorithm.setMaxIterations(2000);
|
||||
VariationCoefficientTermination prematureAlgorithmTermination = new VariationCoefficientTermination(200, 0.001);
|
||||
algorithm.setPrematureAlgorithmTermination(prematureAlgorithmTermination);
|
||||
algorithm.addListener(prematureAlgorithmTermination);
|
||||
// algorithm.setPrematureAlgorithmTermination(prematureAlgorithmTermination);
|
||||
// algorithm.addListener(prematureAlgorithmTermination);
|
||||
// algorithm.addListener(new AlgorithmSearchProgressChartListener("output/progress.png"));
|
||||
|
||||
//search
|
||||
|
|
@ -294,6 +294,7 @@ public class BicycleMessenger {
|
|||
|
||||
//and the problem as well as the solution
|
||||
Plotter plotter1 = new Plotter(bicycleMessengerProblem, Solutions.bestOf(solutions));
|
||||
plotter1.setLabel(Plotter.Label.ID);
|
||||
plotter1.plotShipments(false);
|
||||
// plotter1.setBoundingBox(5000, 45500, 25000, 66500);
|
||||
plotter1.plot("output/bicycleMessengerSolution.png", "bicycleMessenger");
|
||||
|
|
|
|||
|
|
@ -59,7 +59,7 @@ public class MultipleDepotExampleWithPenaltyVehicles {
|
|||
*
|
||||
* each with 14 vehicles each with a capacity of 500 and a maximum duration of 310
|
||||
*/
|
||||
int nuOfVehicles = 14;
|
||||
int nuOfVehicles = 13;
|
||||
int capacity = 500;
|
||||
double maxDuration = 310;
|
||||
Coordinate firstDepotCoord = Coordinate.newInstance(-33, 33);
|
||||
|
|
@ -68,7 +68,8 @@ public class MultipleDepotExampleWithPenaltyVehicles {
|
|||
int depotCounter = 1;
|
||||
for(Coordinate depotCoord : Arrays.asList(firstDepotCoord,second)){
|
||||
for(int i=0;i<nuOfVehicles;i++){
|
||||
VehicleType vehicleType = VehicleTypeImpl.Builder.newInstance(depotCounter + "_type").addCapacityDimension(0, capacity).setCostPerDistance(1.0).build();
|
||||
VehicleType vehicleType = VehicleTypeImpl.Builder.newInstance(depotCounter + "_type")
|
||||
.addCapacityDimension(0, capacity).setFixedCost(100.).setCostPerDistance(1.0).build();
|
||||
String vehicleId = depotCounter + "_" + (i+1) + "_vehicle";
|
||||
VehicleImpl.Builder vehicleBuilder = VehicleImpl.Builder.newInstance(vehicleId);
|
||||
vehicleBuilder.setStartLocationCoordinate(depotCoord);
|
||||
|
|
@ -83,7 +84,7 @@ public class MultipleDepotExampleWithPenaltyVehicles {
|
|||
/*
|
||||
* define penalty-type with the same id, but other higher fixed and variable costs
|
||||
*/
|
||||
vrpBuilder.addPenaltyVehicles(3, 50);
|
||||
// vrpBuilder.addPenaltyVehicles(3, 50);
|
||||
|
||||
/*
|
||||
* define problem with finite fleet
|
||||
|
|
@ -104,7 +105,7 @@ public class MultipleDepotExampleWithPenaltyVehicles {
|
|||
* solve the problem
|
||||
*/
|
||||
VehicleRoutingAlgorithm vra = VehicleRoutingAlgorithms.readAndCreateAlgorithm(vrp, "input/algorithmConfig.xml");
|
||||
vra.setNuOfIterations(5000);
|
||||
vra.setMaxIterations(2000);
|
||||
vra.getAlgorithmListeners().addListener(new StopWatch(),Priority.HIGH);
|
||||
vra.getAlgorithmListeners().addListener(new AlgorithmSearchProgressChartListener("output/progress.png"));
|
||||
Collection<VehicleRoutingProblemSolution> solutions = vra.searchSolutions();
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue