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source: branches/VRP/HeuristicLab.Problems.VehicleRouting/3.4/ProblemInstances/VRPEvaluator.cs @ 8943

Last change on this file since 8943 was 7276, checked in by svonolfe, 13 years ago

Improved incremental evaluation (#1177)

File size: 5.8 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 System;
23using System.Collections.Generic;
24using System.Linq;
25using System.Text;
26using HeuristicLab.Problems.VehicleRouting.Interfaces;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28using HeuristicLab.Core;
29using HeuristicLab.Parameters;
30using HeuristicLab.Data;
31using HeuristicLab.Optimization;
32using HeuristicLab.PluginInfrastructure;
33using HeuristicLab.Problems.VehicleRouting.Variants;
34using HeuristicLab.Problems.VehicleRouting.Encodings;
35using HeuristicLab.Common;
36
37namespace HeuristicLab.Problems.VehicleRouting.ProblemInstances {
38  [Item("VRPEvaluator", "Represents a VRP evaluator.")]
39  [StorableClass]
40  public abstract class VRPEvaluator: VRPOperator, IVRPEvaluator {
41    public ILookupParameter<IVRPEncoding> VRPToursParameter {
42      get { return (ILookupParameter<IVRPEncoding>)Parameters["VRPTours"]; }
43    }
44   
45    #region ISingleObjectiveEvaluator Members
46    public ILookupParameter<DoubleValue> QualityParameter {
47      get { return (ILookupParameter<DoubleValue>)Parameters["Quality"]; }
48    }
49    #endregion
50
51    public ILookupParameter<DoubleValue> DistanceParameter {
52      get { return (ILookupParameter<DoubleValue>)Parameters["Distance"]; }
53    }
54    public ILookupParameter<DoubleValue> VehcilesUtilizedParameter {
55      get { return (ILookupParameter<DoubleValue>)Parameters["VehiclesUtilized"]; }
56    }
57
58    public ILookupParameter<DoubleValue> PenaltyParameter {
59      get { return (ILookupParameter<DoubleValue>)Parameters["Penalty"]; }
60    }
61   
62    [StorableConstructor]
63    protected VRPEvaluator(bool deserializing) : base(deserializing) { }
64
65    public VRPEvaluator() {
66      Parameters.Add(new LookupParameter<IVRPEncoding>("VRPTours", "The VRP tours which should be evaluated."));
67
68      Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The evaluated quality of the VRP solution."));
69      Parameters.Add(new LookupParameter<DoubleValue>("Distance", "The distance."));
70      Parameters.Add(new LookupParameter<DoubleValue>("VehiclesUtilized", "The number of vehicles utilized."));
71
72      Parameters.Add(new LookupParameter<DoubleValue>("Penalty", "The applied penalty."));
73    }
74
75    protected VRPEvaluator(VRPEvaluator original, Cloner cloner)
76      : base(original, cloner) {
77    }
78
79    protected virtual VRPEvaluation CreateTourEvaluation() {
80      return new VRPEvaluation();
81    }
82
83    protected abstract void EvaluateTour(VRPEvaluation eval, IVRPProblemInstance instance, Tour tour, IVRPEncoding solution);
84
85    protected virtual void InitResultParameters() {
86      QualityParameter.ActualValue = new DoubleValue(0);
87      VehcilesUtilizedParameter.ActualValue = new DoubleValue(0);
88      DistanceParameter.ActualValue = new DoubleValue(0);
89      PenaltyParameter.ActualValue = new DoubleValue(0);
90    }
91
92    protected virtual void SetResultParameters(VRPEvaluation tourEvaluation) {
93      QualityParameter.ActualValue.Value = tourEvaluation.Quality;
94      VehcilesUtilizedParameter.ActualValue.Value = tourEvaluation.VehicleUtilization;
95      DistanceParameter.ActualValue.Value = tourEvaluation.Distance;
96      PenaltyParameter.ActualValue.Value = tourEvaluation.Penalty;
97    }
98
99    #region IVRPEvaluator Members
100
101    public bool Feasible(VRPEvaluation evaluation) {
102      return evaluation.Penalty < double.Epsilon;
103    }
104
105    protected abstract double GetTourInsertionCosts(IVRPProblemInstance instance, IVRPEncoding solution, TourInsertionInfo tourInsertionInfo, int index, int customer, out bool feasible);
106
107    public double GetInsertionCosts(IVRPProblemInstance instance, IVRPEncoding solution, VRPEvaluation eval, int customer, int tour, int index, out bool feasible) {
108      bool tourFeasible;
109      double costs = GetTourInsertionCosts(
110        instance,
111        solution,
112        eval.InsertionInfo.GetTourInsertionInfo(tour),
113        index,
114        customer, out tourFeasible);
115
116      feasible = tourFeasible;
117
118      return costs;
119    }
120
121    public VRPEvaluation EvaluateTour(IVRPProblemInstance instance, Tour tour, IVRPEncoding solution) {
122      VRPEvaluation evaluation = CreateTourEvaluation();
123      EvaluateTour(evaluation, instance, tour, solution);
124      return evaluation;
125    }
126
127    public VRPEvaluation Evaluate(IVRPProblemInstance instance, IVRPEncoding solution) {
128      VRPEvaluation evaluation = CreateTourEvaluation();
129
130      foreach (Tour tour in solution.GetTours()) {
131        EvaluateTour(evaluation, instance, tour, solution);
132      }
133
134      return evaluation;
135    }
136
137    public override IOperation Apply() {
138      InitResultParameters();
139
140      VRPEvaluation evaluation = CreateTourEvaluation();
141      IVRPEncoding solution = VRPToursParameter.ActualValue;
142      foreach (Tour tour in solution.GetTours()) {
143        EvaluateTour(evaluation, ProblemInstance, tour, solution);
144      }
145      SetResultParameters(evaluation);
146
147      QualityParameter.ActualValue = new DoubleValue(evaluation.Quality);
148
149      return base.Apply();
150    }
151
152    #endregion
153  }
154}
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