[4205] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using System.Linq;
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| 24 | using HeuristicLab.Collections;
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| 25 | using HeuristicLab.Core;
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| 26 | using HeuristicLab.Operators;
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| 27 | using HeuristicLab.Optimization;
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| 28 | using HeuristicLab.Parameters;
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| 29 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 30 | using HeuristicLab.PluginInfrastructure;
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| 31 | using HeuristicLab.Data;
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| 32 | using System.Collections.Generic;
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| 33 |
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| 34 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.General {
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| 35 | [Item("MultiVRPMoveGenerator", "Randomly selects and applies its move generators.")]
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| 36 | [StorableClass]
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| 37 | public class MultiVRPMoveGenerator : CheckedMultiOperator<IMultiVRPMoveGenerator>, IMultiVRPMoveOperator,
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| 38 | IStochasticOperator, IMultiMoveGenerator {
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| 39 | public override bool CanChangeName {
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| 40 | get { return false; }
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| 41 | }
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| 42 |
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| 43 | public IValueLookupParameter<IntValue> SampleSizeParameter {
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| 44 | get { return (IValueLookupParameter<IntValue>)Parameters["SampleSize"]; }
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| 45 | }
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| 46 |
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| 47 | public ILookupParameter<IVRPEncoding> VRPToursParameter {
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| 48 | get { return (ILookupParameter<IVRPEncoding>)Parameters["VRPTours"]; }
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| 49 | }
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| 50 |
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| 51 | public ILookupParameter VRPMoveParameter {
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| 52 | get { return (ILookupParameter)Parameters["VRPMove"]; }
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| 53 | }
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| 54 |
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| 55 | public int Cities {
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| 56 | get { return CoordinatesParameter.ActualValue.Rows - 1; }
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| 57 | }
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| 58 | public ILookupParameter<DoubleMatrix> CoordinatesParameter {
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| 59 | get { return (ILookupParameter<DoubleMatrix>)Parameters["Coordinates"]; }
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| 60 | }
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| 61 | public ILookupParameter<DoubleMatrix> DistanceMatrixParameter {
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| 62 | get { return (ILookupParameter<DoubleMatrix>)Parameters["DistanceMatrix"]; }
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| 63 | }
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| 64 | public ILookupParameter<BoolValue> UseDistanceMatrixParameter {
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| 65 | get { return (ILookupParameter<BoolValue>)Parameters["UseDistanceMatrix"]; }
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| 66 | }
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| 67 | public ILookupParameter<IntValue> VehiclesParameter {
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| 68 | get { return (ILookupParameter<IntValue>)Parameters["Vehicles"]; }
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| 69 | }
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| 70 | public ILookupParameter<DoubleValue> CapacityParameter {
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| 71 | get { return (ILookupParameter<DoubleValue>)Parameters["Capacity"]; }
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| 72 | }
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| 73 | public ILookupParameter<DoubleArray> DemandParameter {
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| 74 | get { return (ILookupParameter<DoubleArray>)Parameters["Demand"]; }
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| 75 | }
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| 76 | public ILookupParameter<DoubleArray> ReadyTimeParameter {
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| 77 | get { return (ILookupParameter<DoubleArray>)Parameters["ReadyTime"]; }
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| 78 | }
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| 79 | public ILookupParameter<DoubleArray> DueTimeParameter {
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| 80 | get { return (ILookupParameter<DoubleArray>)Parameters["DueTime"]; }
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| 81 | }
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| 82 | public ILookupParameter<DoubleArray> ServiceTimeParameter {
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| 83 | get { return (ILookupParameter<DoubleArray>)Parameters["ServiceTime"]; }
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| 84 | }
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| 85 |
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| 86 | public ValueLookupParameter<DoubleArray> ProbabilitiesParameter {
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| 87 | get { return (ValueLookupParameter<DoubleArray>)Parameters["Probabilities"]; }
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| 88 | }
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| 89 | public ILookupParameter<IRandom> RandomParameter {
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| 90 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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| 91 | }
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| 92 |
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| 93 | public DoubleArray Probabilities {
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| 94 | get { return ProbabilitiesParameter.Value; }
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| 95 | set { ProbabilitiesParameter.Value = value; }
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| 96 | }
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| 97 |
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| 98 | [StorableConstructor]
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| 99 | private MultiVRPMoveGenerator(bool deserializing) : base(deserializing) { }
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| 100 | public MultiVRPMoveGenerator()
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| 101 | : base() {
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| 102 | Parameters.Add(new ValueLookupParameter<IntValue>("SampleSize", "The number of moves to generate."));
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| 103 | Parameters.Add(new LookupParameter<IRandom>("Random", "The pseudo random number generator which should be used for stochastic manipulation operators."));
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| 104 | Parameters.Add(new ValueLookupParameter<DoubleArray>("Probabilities", "The array of relative probabilities for each operator.", new DoubleArray()));
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| 105 |
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| 106 | Parameters.Add(new ValueLookupParameter<IntValue>("Cities", "The city count."));
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| 107 | Parameters.Add(new LookupParameter<DoubleMatrix>("Coordinates", "The coordinates of the cities."));
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| 108 | Parameters.Add(new LookupParameter<DoubleMatrix>("DistanceMatrix", "The matrix which contains the distances between the cities."));
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| 109 | Parameters.Add(new LookupParameter<BoolValue>("UseDistanceMatrix", "True if a distance matrix should be calculated and used for evaluation, otherwise false."));
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| 110 | Parameters.Add(new LookupParameter<IntValue>("Vehicles", "The number of vehicles."));
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| 111 | Parameters.Add(new LookupParameter<DoubleValue>("Capacity", "The capacity of each vehicle."));
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| 112 | Parameters.Add(new LookupParameter<DoubleArray>("Demand", "The demand of each customer."));
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| 113 | Parameters.Add(new LookupParameter<DoubleArray>("ReadyTime", "The ready time of each customer."));
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| 114 | Parameters.Add(new LookupParameter<DoubleArray>("DueTime", "The due time of each customer."));
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| 115 | Parameters.Add(new LookupParameter<DoubleArray>("ServiceTime", "The service time of each customer."));
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| 116 |
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| 117 | Parameters.Add(new LookupParameter<IVRPEncoding>("VRPTours", "The VRP tours."));
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| 118 | Parameters.Add(new LookupParameter<IVRPMove>("VRPMove", "The generated moves."));
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| 119 |
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| 120 | foreach (Type type in ApplicationManager.Manager.GetTypes(typeof(IMultiVRPMoveGenerator))) {
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| 121 | if (!typeof(MultiOperator<IMultiVRPMoveGenerator>).IsAssignableFrom(type))
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| 122 | Operators.Add((IMultiVRPMoveGenerator)Activator.CreateInstance(type), true);
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| 123 | }
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| 124 | }
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| 125 |
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| 126 | protected override void Operators_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<IndexedItem<IMultiVRPMoveGenerator>> e) {
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| 127 | base.Operators_ItemsRemoved(sender, e);
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| 128 | if (Probabilities != null && Probabilities.Length > Operators.Count) {
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| 129 | List<double> probs = new List<double>(Probabilities.Cast<double>());
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| 130 | var sorted = e.Items.OrderByDescending(x => x.Index);
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| 131 | foreach (IndexedItem<IMultiVRPMoveGenerator> item in sorted)
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| 132 | if (probs.Count > item.Index) probs.RemoveAt(item.Index);
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| 133 | Probabilities = new DoubleArray(probs.ToArray());
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| 134 | }
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| 135 | }
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| 136 |
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| 137 | protected override void Operators_ItemsReplaced(object sender, CollectionItemsChangedEventArgs<IndexedItem<IMultiVRPMoveGenerator>> e) {
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| 138 | base.Operators_ItemsReplaced(sender, e);
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| 139 | ParameterizeMoveGenerators();
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| 140 | }
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| 141 |
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| 142 | protected override void Operators_ItemsAdded(object sender, CollectionItemsChangedEventArgs<IndexedItem<IMultiVRPMoveGenerator>> e) {
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| 143 | base.Operators_ItemsAdded(sender, e);
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| 144 | ParameterizeMoveGenerators();
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| 145 |
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| 146 | if (Probabilities != null && Probabilities.Length < Operators.Count) {
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| 147 | double avg = (Probabilities.Where(x => x > 0).Count() > 0) ? (Probabilities.Where(x => x > 0).Average()) : (1);
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| 148 | // add the average of all probabilities in the respective places (the new operators)
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| 149 | var added = e.Items.OrderBy(x => x.Index).ToList();
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| 150 | int insertCount = 0;
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| 151 | DoubleArray probs = new DoubleArray(Operators.Count);
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| 152 | for (int i = 0; i < Operators.Count; i++) {
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| 153 | if (insertCount < added.Count && i == added[insertCount].Index) {
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| 154 | probs[i] = avg;
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| 155 | insertCount++;
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| 156 | } else if (i - insertCount < Probabilities.Length) {
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| 157 | probs[i] = Probabilities[i - insertCount];
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| 158 | } else probs[i] = avg;
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| 159 | }
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| 160 | Probabilities = probs;
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| 161 | }
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| 162 | }
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| 163 |
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| 164 | private void ParameterizeMoveGenerators() {
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| 165 | foreach (IMultiVRPMoveOperator moveGenerator in Operators.OfType<IMultiVRPMoveOperator>()) {
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| 166 | if (moveGenerator.CoordinatesParameter != null) moveGenerator.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
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| 167 | if (moveGenerator.DistanceMatrixParameter != null) moveGenerator.DistanceMatrixParameter.ActualName = DistanceMatrixParameter.Name;
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| 168 | if (moveGenerator.UseDistanceMatrixParameter != null) moveGenerator.UseDistanceMatrixParameter.ActualName = UseDistanceMatrixParameter.Name;
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| 169 | if (moveGenerator.VehiclesParameter != null) moveGenerator.VehiclesParameter.ActualName = VehiclesParameter.Name;
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| 170 | if (moveGenerator.CapacityParameter != null) moveGenerator.CapacityParameter.ActualName = CapacityParameter.Name;
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| 171 | if (moveGenerator.DemandParameter != null) moveGenerator.DemandParameter.ActualName = DemandParameter.Name;
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| 172 | if (moveGenerator.ReadyTimeParameter != null) moveGenerator.ReadyTimeParameter.ActualName = ReadyTimeParameter.Name;
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| 173 | if (moveGenerator.DueTimeParameter != null) moveGenerator.DueTimeParameter.ActualName = DueTimeParameter.Name;
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| 174 | if (moveGenerator.ServiceTimeParameter != null) moveGenerator.ServiceTimeParameter.ActualName = ServiceTimeParameter.Name;
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| 175 |
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| 176 | moveGenerator.VRPToursParameter.ActualName = VRPToursParameter.Name;
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| 177 | moveGenerator.VRPMoveParameter.ActualName = VRPMoveParameter.Name;
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| 178 | }
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| 179 | foreach (IStochasticOperator moveGenerator in Operators.OfType<IStochasticOperator>()) {
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| 180 | moveGenerator.RandomParameter.ActualName = RandomParameter.Name;
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| 181 | }
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| 182 | }
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| 183 |
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| 184 | public override IOperation Apply() {
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| 185 | if (Operators.Count == 0) throw new InvalidOperationException(Name + ": Please add at least one VRP move generator choose from.");
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| 186 | OperationCollection next = new OperationCollection(base.Apply());
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| 187 |
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| 188 | for (int i = 0; i < SampleSizeParameter.ActualValue.Value; i++) {
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| 189 | IRandom random = RandomParameter.ActualValue;
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| 190 | DoubleArray probabilities = ProbabilitiesParameter.ActualValue;
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| 191 | if (probabilities.Length != Operators.Count) {
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| 192 | throw new InvalidOperationException(Name + ": The list of probabilities has to match the number of operators");
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| 193 | }
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| 194 | IOperator successor = null;
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| 195 | var checkedOperators = Operators.CheckedItems;
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| 196 | if (checkedOperators.Count() > 0) {
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| 197 | // select a random operator from the checked operators
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| 198 | double sum = (from indexedItem in checkedOperators select probabilities[indexedItem.Index]).Sum();
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| 199 | if (sum == 0) throw new InvalidOperationException(Name + ": All selected operators have zero probability.");
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| 200 | double r = random.NextDouble() * sum;
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| 201 | sum = 0;
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| 202 | foreach (var indexedItem in checkedOperators) {
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| 203 | sum += probabilities[indexedItem.Index];
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| 204 | if (sum > r) {
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| 205 | successor = indexedItem.Value;
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| 206 | break;
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| 207 | }
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| 208 | }
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| 209 | }
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| 210 |
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| 211 | if (successor != null) {
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| 212 | next.Insert(0, ExecutionContext.CreateChildOperation(successor));
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| 213 | }
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| 214 | }
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| 215 |
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| 216 | return next;
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| 217 | }
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| 218 | }
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| 219 | }
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