source: branches/VRP/HeuristicLab.Problems.VehicleRouting/3.4/Encodings/Potvin/Moves/PickupDelivery/PDShift/PotvinPDShiftMoveMaker.cs @ 7791

Last change on this file since 7791 was 7791, checked in by svonolfe, 7 years ago

Improved PDP moves (#1177)

File size: 4.8 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using HeuristicLab.Core;
23using HeuristicLab.Data;
24using HeuristicLab.Operators;
25using HeuristicLab.Optimization;
26using HeuristicLab.Parameters;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28using HeuristicLab.Common;
29using HeuristicLab.Problems.VehicleRouting.ProblemInstances;
30using HeuristicLab.Problems.VehicleRouting.Interfaces;
31using HeuristicLab.Problems.VehicleRouting.Variants;
32using System.Collections.Generic;
33
34namespace HeuristicLab.Problems.VehicleRouting.Encodings.Potvin {
35  [Item("PotvinPDShiftMoveMaker", "Peforms the shift move on a given PDP encoding and updates the quality.")]
36  [StorableClass]
37  public class PotvinPDShiftMoveMaker : PotvinMoveMaker, IPotvinPDShiftMoveOperator, IMoveMaker {
38    public ILookupParameter<PotvinPDShiftMove> PDShiftMoveParameter {
39      get { return (ILookupParameter<PotvinPDShiftMove>)Parameters["PotvinPDShiftMove"]; }
40    }
41
42    public override ILookupParameter VRPMoveParameter {
43      get { return PDShiftMoveParameter; }
44    }
45
46    [StorableConstructor]
47    private PotvinPDShiftMoveMaker(bool deserializing) : base(deserializing) { }
48
49    public PotvinPDShiftMoveMaker()
50      : base() {
51        Parameters.Add(new LookupParameter<PotvinPDShiftMove>("PotvinPDShiftMove", "The moves that should be made."));
52     }
53
54    public override IDeepCloneable Clone(Cloner cloner) {
55      return new PotvinPDShiftMoveMaker(this, cloner);
56    }
57
58    protected PotvinPDShiftMoveMaker(PotvinPDShiftMoveMaker original, Cloner cloner)
59      : base(original, cloner) {
60    }
61
62    public static void Apply(PotvinEncoding solution, PotvinPDShiftMove move, IVRPProblemInstance problemInstance) {
63      bool newTour = false;
64
65      if (move.Tour >= solution.Tours.Count) {
66        solution.Tours.Add(new Tour());
67        newTour = true;
68      }
69      Tour tour = solution.Tours[move.Tour];
70
71      Tour oldTour = solution.Tours.Find(t => t.Stops.Contains(move.City));
72      oldTour.Stops.Remove(move.City);
73
74      if (problemInstance is IPickupAndDeliveryProblemInstance) {
75        IPickupAndDeliveryProblemInstance pdp = problemInstance as IPickupAndDeliveryProblemInstance;
76       
77        int location = pdp.GetPickupDeliveryLocation(move.City);
78        Tour oldTour2 = solution.Tours.Find(t => t.Stops.Contains(location));
79        oldTour2.Stops.Remove(location);
80
81        solution.InsertPair(tour, move.City, location, problemInstance);
82      } else {
83        int place = solution.FindBestInsertionPlace(tour, move.City);
84        tour.Stops.Insert(place, move.City);
85      }
86
87      if (newTour) {
88        List<int> vehicles = new List<int>();
89        for (int i = move.Tour; i < problemInstance.Vehicles.Value; i++) {
90          vehicles.Add(solution.GetVehicleAssignment(i));
91        }
92
93        double bestQuality = double.MaxValue;
94        int bestVehicle = -1;
95
96        int originalVehicle = solution.GetVehicleAssignment(move.Tour);
97        foreach (int vehicle in vehicles) {
98          solution.VehicleAssignment[move.Tour] = vehicle;
99
100          double quality = problemInstance.EvaluateTour(tour, solution).Quality;
101          if (quality < bestQuality) {
102            bestQuality = quality;
103            bestVehicle = vehicle;
104          }
105        }
106
107        solution.VehicleAssignment[move.Tour] = originalVehicle;
108
109        int index = -1;
110        for (int i = move.Tour; i < solution.VehicleAssignment.Length; i++) {
111          if (solution.VehicleAssignment[i] == bestVehicle) {
112            index = i;
113            break;
114          }
115        }
116        solution.VehicleAssignment[index] = originalVehicle;
117        solution.VehicleAssignment[move.Tour] = bestVehicle;
118      }
119
120      solution.Repair();
121    }
122
123    protected override void PerformMove() {
124      PotvinPDShiftMove move = PDShiftMoveParameter.ActualValue;
125
126      PotvinEncoding newSolution = move.Individual.Clone() as PotvinEncoding;
127      Apply(newSolution, move, ProblemInstance);
128      VRPToursParameter.ActualValue = newSolution;
129    }
130  }
131}
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