[13412] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[17226] | 3 | * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[13412] | 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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[17253] | 23 | using System.Collections.Generic;
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[13412] | 24 | using System.Linq;
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[17253] | 25 | using HEAL.Attic;
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[13412] | 26 | using HeuristicLab.Common;
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[12191] | 27 | using HeuristicLab.Core;
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[13412] | 28 | using HeuristicLab.Data;
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| 29 | using HeuristicLab.Encodings.PermutationEncoding;
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| 30 | using HeuristicLab.Parameters;
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[12261] | 31 | using HeuristicLab.Random;
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[12191] | 32 |
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| 33 | namespace HeuristicLab.Problems.PTSP {
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[17253] | 34 | [Item("Estimated Probabilistic TSP (p-TSP)", "Represents a probabilistic traveling salesman problem where the expected tour length is estimated by averaging over the length of tours on a number of, so called, realizations.")]
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[13412] | 35 | [Creatable(CreatableAttribute.Categories.CombinatorialProblems)]
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[17253] | 36 | [StorableType("d1b4149b-8ab9-4314-8d96-9ea04a4d5b8b")]
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| 37 | public sealed class EstimatedPTSP : ProbabilisticTSP {
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[12191] | 38 |
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[12306] | 39 | #region Parameter Properties
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[17253] | 40 | [Storable] public IFixedValueParameter<IntValue> RealizationsSeedParameter { get; private set; }
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| 41 | [Storable] public IFixedValueParameter<IntValue> RealizationsParameter { get; private set; }
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| 42 | [Storable] private IValueParameter<ReadOnlyItemList<BoolArray>> RealizationDataParameter { get; set; }
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[12306] | 43 | #endregion
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| 44 |
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| 45 | #region Properties
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[17253] | 46 |
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| 47 | public int RealizationsSeed {
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| 48 | get { return RealizationsSeedParameter.Value.Value; }
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| 49 | set { RealizationsSeedParameter.Value.Value = value; }
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[12306] | 50 | }
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[12387] | 51 |
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[17253] | 52 | public int Realizations {
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| 53 | get { return RealizationsParameter.Value.Value; }
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| 54 | set { RealizationsParameter.Value.Value = value; }
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[12387] | 55 | }
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[17253] | 56 |
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| 57 | private ReadOnlyItemList<BoolArray> RealizationData {
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| 58 | get { return RealizationDataParameter.Value; }
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| 59 | set { RealizationDataParameter.Value = value; }
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| 60 | }
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[12306] | 61 | #endregion
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| 62 |
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[12191] | 63 | [StorableConstructor]
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[17253] | 64 | private EstimatedPTSP(StorableConstructorFlag _) : base(_) { }
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| 65 | private EstimatedPTSP(EstimatedPTSP original, Cloner cloner)
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[12191] | 66 | : base(original, cloner) {
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[17253] | 67 | RealizationsSeedParameter = cloner.Clone(original.RealizationsSeedParameter);
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| 68 | RealizationsParameter = cloner.Clone(original.RealizationsParameter);
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| 69 | RealizationDataParameter = cloner.Clone(original.RealizationDataParameter);
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[12387] | 70 | RegisterEventHandlers();
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[12191] | 71 | }
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[17253] | 72 | public EstimatedPTSP() {
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| 73 | Parameters.Add(RealizationsSeedParameter = new FixedValueParameter<IntValue>("RealizationsSeed", "The starting seed of the RNG from which realizations should be drawn.", new IntValue(1)));
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| 74 | Parameters.Add(RealizationsParameter = new FixedValueParameter<IntValue>("Realizations", "The number of realizations that should be made.", new IntValue(100)));
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| 75 | Parameters.Add(RealizationDataParameter = new ValueParameter<ReadOnlyItemList<BoolArray>>("RealizationData", "The actual realizations.") { Hidden = true, GetsCollected = false });
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[12799] | 76 |
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[13412] | 77 | Operators.Add(new PTSPEstimatedInversionMoveEvaluator());
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| 78 | Operators.Add(new PTSPEstimatedInsertionMoveEvaluator());
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[13470] | 79 | Operators.Add(new PTSPEstimatedInversionLocalImprovement());
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| 80 | Operators.Add(new PTSPEstimatedInsertionLocalImprovement());
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| 81 | Operators.Add(new PTSPEstimatedTwoPointFiveLocalImprovement());
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[12191] | 82 |
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[13412] | 83 | Operators.Add(new ExhaustiveTwoPointFiveMoveGenerator());
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| 84 | Operators.Add(new StochasticTwoPointFiveMultiMoveGenerator());
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| 85 | Operators.Add(new StochasticTwoPointFiveSingleMoveGenerator());
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[12387] | 86 | Operators.Add(new TwoPointFiveMoveMaker());
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[13470] | 87 | Operators.Add(new PTSPEstimatedTwoPointFiveMoveEvaluator());
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[12387] | 88 |
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| 89 | Encoding.ConfigureOperators(Operators.OfType<IOperator>());
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[13412] | 90 | foreach (var twopointfiveMoveOperator in Operators.OfType<ITwoPointFiveMoveOperator>()) {
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[12387] | 91 | twopointfiveMoveOperator.TwoPointFiveMoveParameter.ActualName = "Permutation.TwoPointFiveMove";
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| 92 | }
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[13412] | 93 |
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[13470] | 94 | UpdateRealizations();
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[12387] | 95 | RegisterEventHandlers();
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| 96 | }
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| 97 |
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[12191] | 98 | public override IDeepCloneable Clone(Cloner cloner) {
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[17253] | 99 | return new EstimatedPTSP(this, cloner);
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[12191] | 100 | }
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| 101 |
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[17253] | 102 | public override double Evaluate(Permutation tour, IRandom random) {
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| 103 | return Evaluate(tour, ProbabilisticTSPData, RealizationData);
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| 104 | }
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| 105 |
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[13412] | 106 | [StorableHook(HookType.AfterDeserialization)]
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| 107 | private void AfterDeserialization() {
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| 108 | RegisterEventHandlers();
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| 109 | }
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| 110 |
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[17253] | 111 | public static double Evaluate(Permutation tour, IProbabilisticTSPData data, IEnumerable<BoolArray> realizations) {
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[13470] | 112 | // Estimation-based evaluation, here without calculating variance for faster evaluation
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[13412] | 113 | var estimatedSum = 0.0;
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[17253] | 114 | var count = 0;
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| 115 | foreach (var r in realizations) {
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[12261] | 116 | int singleRealization = -1, firstNode = -1;
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[17253] | 117 | for (var j = 0; j < data.Cities; j++) {
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| 118 | if (r[tour[j]]) {
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[12191] | 119 | if (singleRealization != -1) {
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[17253] | 120 | estimatedSum += data.GetDistance(singleRealization, tour[j]);
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[12261] | 121 | } else {
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[13412] | 122 | firstNode = tour[j];
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[12191] | 123 | }
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[13412] | 124 | singleRealization = tour[j];
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[12191] | 125 | }
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| 126 | }
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[17253] | 127 | if (singleRealization != -1)
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| 128 | estimatedSum += data.GetDistance(singleRealization, firstNode);
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| 129 | count++;
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[12191] | 130 | }
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[17253] | 131 | return estimatedSum / count;
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[12191] | 132 | }
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| 133 |
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[13412] | 134 | /// <summary>
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| 135 | /// An evaluate method that can be used if mean as well as variance should be calculated
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| 136 | /// </summary>
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| 137 | /// <param name="tour">The tour between all cities.</param>
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[17253] | 138 | /// <param name="data">The main parameters of the p-TSP.</param>
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| 139 | /// <param name="realizations">How many realizations to achieve.</param>
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| 140 | /// <param name="seed">The starting seed of generating the realizations.</param>
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[13470] | 141 | /// <param name="variance">The estimated variance will be returned in addition to the mean.</param>
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[13412] | 142 | /// <returns>A vector with length two containing mean and variance.</returns>
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[17253] | 143 | public static double Evaluate(Permutation tour, IProbabilisticTSPData data, IEnumerable<BoolArray> realizations, out double variance) {
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[12261] | 144 | // Estimation-based evaluation
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[13412] | 145 | var estimatedSum = 0.0;
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[17253] | 146 | var partialSums = new List<double>();
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| 147 | var count = 0;
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| 148 | foreach (var r in realizations) {
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| 149 | var pSum = 0.0;
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[12261] | 150 | int singleRealization = -1, firstNode = -1;
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[17253] | 151 | for (var j = 0; j < data.Cities; j++) {
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| 152 | if (r[tour[j]]) {
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[12261] | 153 | if (singleRealization != -1) {
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[17253] | 154 | pSum += data.GetDistance(singleRealization, tour[j]);
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[12261] | 155 | } else {
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[13412] | 156 | firstNode = tour[j];
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[12261] | 157 | }
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[13412] | 158 | singleRealization = tour[j];
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[12261] | 159 | }
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| 160 | }
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| 161 | if (singleRealization != -1) {
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[17253] | 162 | pSum += data.GetDistance(singleRealization, firstNode);
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[12261] | 163 | }
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[17253] | 164 | estimatedSum += pSum;
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| 165 | partialSums.Add(pSum);
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| 166 | count++;
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[12261] | 167 | }
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[17253] | 168 | var mean = estimatedSum / count;
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[13470] | 169 | variance = 0.0;
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[17253] | 170 | for (var i = 0; i < count; i++) {
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[12261] | 171 | variance += Math.Pow((partialSums[i] - mean), 2);
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| 172 | }
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[17253] | 173 | variance = variance / count;
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[13470] | 174 | return mean;
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[12261] | 175 | }
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| 176 |
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[17253] | 177 | private void RegisterEventHandlers() {
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| 178 | RealizationsParameter.Value.ValueChanged += RealizationsOnChanged;
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| 179 | RealizationsSeedParameter.Value.ValueChanged += RealizationsSeedOnChanged;
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| 180 | }
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| 181 |
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| 182 | private void RealizationsSeedOnChanged(object sender, EventArgs e) {
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[13470] | 183 | UpdateRealizations();
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[17253] | 184 | }
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[13470] | 185 |
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[17253] | 186 | private void RealizationsOnChanged(object sender, EventArgs e) {
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| 187 | if (Realizations <= 0) Realizations = 1;
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| 188 | else UpdateRealizations();
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[12387] | 189 | }
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[12272] | 190 |
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[12387] | 191 | private void UpdateRealizations() {
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[17253] | 192 | var data = new List<BoolArray>(Realizations);
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| 193 | var rng = new FastRandom(RealizationsSeed);
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| 194 | for (var i = 0; i < Realizations; i++) {
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| 195 | var cities = 0;
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| 196 | var r = new bool[ProbabilisticTSPData.Cities];
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| 197 | for (var j = 0; j < ProbabilisticTSPData.Cities; j++) {
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| 198 | if (rng.NextDouble() < ProbabilisticTSPData.GetProbability(j)) {
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| 199 | r[j] = true;
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| 200 | cities++;
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[12219] | 201 | }
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[17253] | 202 | }
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| 203 | if (cities > 0) {
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| 204 | data.Add(new BoolArray(r, @readonly: true));
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| 205 | }
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[12219] | 206 | }
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[17253] | 207 | RealizationData = (new ItemList<BoolArray>(data)).AsReadOnly();
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[12387] | 208 | }
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[12191] | 209 | }
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| 210 | } |
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