1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2019 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.Collections.Generic;
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24 | using System.Linq;
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25 | using HeuristicLab.Analysis;
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26 | using HeuristicLab.Common;
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27 | using HeuristicLab.Core;
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28 | using HeuristicLab.Data;
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29 | using HeuristicLab.Encodings.BinaryVectorEncoding;
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30 | using HeuristicLab.Optimization;
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31 | using HeuristicLab.Optimization.Operators;
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32 | using HeuristicLab.Parameters;
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33 | using HEAL.Attic;
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34 | using HeuristicLab.PluginInfrastructure;
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35 |
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36 | namespace HeuristicLab.Problems.Knapsack {
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37 | [Item("Knapsack Problem (KSP)", "Represents a Knapsack problem.")]
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38 | [Creatable(CreatableAttribute.Categories.CombinatorialProblems, Priority = 200)]
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39 | [StorableType("8CEDAFA2-6E0A-4D4B-B6C6-F85CC58B824E")]
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40 | public sealed class KnapsackProblem : SingleObjectiveHeuristicOptimizationProblem<IKnapsackEvaluator, IBinaryVectorCreator>, IStorableContent {
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41 | public string Filename { get; set; }
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42 |
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43 | #region Parameter Properties
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44 | public ValueParameter<IntValue> KnapsackCapacityParameter {
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45 | get { return (ValueParameter<IntValue>)Parameters["KnapsackCapacity"]; }
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46 | }
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47 | public ValueParameter<IntArray> WeightsParameter {
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48 | get { return (ValueParameter<IntArray>)Parameters["Weights"]; }
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49 | }
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50 | public ValueParameter<IntArray> ValuesParameter {
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51 | get { return (ValueParameter<IntArray>)Parameters["Values"]; }
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52 | }
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53 | public ValueParameter<DoubleValue> PenaltyParameter {
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54 | get { return (ValueParameter<DoubleValue>)Parameters["Penalty"]; }
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55 | }
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56 | public OptionalValueParameter<BinaryVector> BestKnownSolutionParameter {
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57 | get { return (OptionalValueParameter<BinaryVector>)Parameters["BestKnownSolution"]; }
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58 | }
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59 | #endregion
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60 |
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61 | #region Properties
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62 | public IntValue KnapsackCapacity {
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63 | get { return KnapsackCapacityParameter.Value; }
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64 | set { KnapsackCapacityParameter.Value = value; }
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65 | }
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66 | public IntArray Weights {
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67 | get { return WeightsParameter.Value; }
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68 | set { WeightsParameter.Value = value; }
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69 | }
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70 | public IntArray Values {
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71 | get { return ValuesParameter.Value; }
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72 | set { ValuesParameter.Value = value; }
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73 | }
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74 | public DoubleValue Penalty {
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75 | get { return PenaltyParameter.Value; }
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76 | set { PenaltyParameter.Value = value; }
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77 | }
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78 | public BinaryVector BestKnownSolution {
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79 | get { return BestKnownSolutionParameter.Value; }
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80 | set { BestKnownSolutionParameter.Value = value; }
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81 | }
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82 | private BestKnapsackSolutionAnalyzer BestKnapsackSolutionAnalyzer {
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83 | get { return Operators.OfType<BestKnapsackSolutionAnalyzer>().FirstOrDefault(); }
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84 | }
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85 | #endregion
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86 |
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87 | // BackwardsCompatibility3.3
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88 | #region Backwards compatible code, remove with 3.4
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89 | [Obsolete]
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90 | [Storable(Name = "operators")]
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91 | private IEnumerable<IOperator> oldOperators {
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92 | get { return null; }
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93 | set {
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94 | if (value != null && value.Any())
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95 | Operators.AddRange(value);
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96 | }
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97 | }
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98 | #endregion
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99 |
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100 | [StorableConstructor]
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101 | private KnapsackProblem(StorableConstructorFlag _) : base(_) { }
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102 | private KnapsackProblem(KnapsackProblem original, Cloner cloner)
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103 | : base(original, cloner) {
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104 | RegisterEventHandlers();
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105 | }
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106 | public override IDeepCloneable Clone(Cloner cloner) {
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107 | return new KnapsackProblem(this, cloner);
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108 | }
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109 | public KnapsackProblem()
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110 | : base(new KnapsackEvaluator(), new RandomBinaryVectorCreator()) {
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111 | Parameters.Add(new ValueParameter<IntValue>("KnapsackCapacity", "Capacity of the Knapsack.", new IntValue(0)));
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112 | Parameters.Add(new ValueParameter<IntArray>("Weights", "The weights of the items.", new IntArray(5)));
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113 | Parameters.Add(new ValueParameter<IntArray>("Values", "The values of the items.", new IntArray(5)));
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114 | Parameters.Add(new ValueParameter<DoubleValue>("Penalty", "The penalty value for each unit of overweight.", new DoubleValue(1)));
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115 | Parameters.Add(new OptionalValueParameter<BinaryVector>("BestKnownSolution", "The best known solution of this Knapsack instance."));
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116 |
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117 | Maximization.Value = true;
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118 | MaximizationParameter.Hidden = true;
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119 |
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120 | SolutionCreator.BinaryVectorParameter.ActualName = "KnapsackSolution";
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121 |
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122 | InitializeRandomKnapsackInstance();
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123 |
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124 | ParameterizeSolutionCreator();
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125 | ParameterizeEvaluator();
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126 |
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127 | InitializeOperators();
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128 | RegisterEventHandlers();
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129 | }
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130 |
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131 | #region Events
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132 | protected override void OnSolutionCreatorChanged() {
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133 | base.OnSolutionCreatorChanged();
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134 | SolutionCreator.BinaryVectorParameter.ActualNameChanged += new EventHandler(SolutionCreator_BinaryVectorParameter_ActualNameChanged);
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135 | ParameterizeSolutionCreator();
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136 | ParameterizeEvaluator();
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137 | ParameterizeAnalyzer();
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138 | ParameterizeOperators();
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139 | }
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140 | protected override void OnEvaluatorChanged() {
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141 | base.OnEvaluatorChanged();
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142 | ParameterizeEvaluator();
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143 | ParameterizeAnalyzer();
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144 | }
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145 | private void SolutionCreator_BinaryVectorParameter_ActualNameChanged(object sender, EventArgs e) {
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146 | ParameterizeEvaluator();
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147 | ParameterizeAnalyzer();
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148 | ParameterizeOperators();
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149 | }
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150 | private void KnapsackCapacityParameter_ValueChanged(object sender, EventArgs e) {
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151 | ParameterizeEvaluator();
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152 | ParameterizeAnalyzer();
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153 | }
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154 | private void WeightsParameter_ValueChanged(object sender, EventArgs e) {
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155 | ParameterizeEvaluator();
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156 | ParameterizeAnalyzer();
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157 | ParameterizeSolutionCreator();
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158 |
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159 | WeightsParameter.Value.Reset += new EventHandler(WeightsValue_Reset);
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160 | }
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161 | private void WeightsValue_Reset(object sender, EventArgs e) {
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162 | ParameterizeSolutionCreator();
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163 |
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164 | if (WeightsParameter.Value != null && ValuesParameter.Value != null)
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165 | ((IStringConvertibleArray)ValuesParameter.Value).Length = WeightsParameter.Value.Length;
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166 | }
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167 | private void ValuesParameter_ValueChanged(object sender, EventArgs e) {
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168 | ParameterizeEvaluator();
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169 | ParameterizeAnalyzer();
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170 | ParameterizeSolutionCreator();
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171 |
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172 | ValuesParameter.Value.Reset += new EventHandler(ValuesValue_Reset);
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173 | }
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174 | private void ValuesValue_Reset(object sender, EventArgs e) {
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175 | ParameterizeSolutionCreator();
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176 |
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177 | if (WeightsParameter.Value != null && ValuesParameter.Value != null)
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178 | ((IStringConvertibleArray)WeightsParameter.Value).Length = ValuesParameter.Value.Length;
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179 | }
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180 | private void PenaltyParameter_ValueChanged(object sender, EventArgs e) {
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181 | ParameterizeEvaluator();
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182 | }
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183 | private void OneBitflipMoveParameter_ActualNameChanged(object sender, EventArgs e) {
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184 | string name = ((ILookupParameter<OneBitflipMove>)sender).ActualName;
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185 | foreach (IOneBitflipMoveOperator op in Operators.OfType<IOneBitflipMoveOperator>()) {
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186 | op.OneBitflipMoveParameter.ActualName = name;
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187 | }
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188 | }
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189 | #endregion
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190 |
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191 | #region Helpers
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192 | [StorableHook(HookType.AfterDeserialization)]
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193 | private void AfterDeserialization() {
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194 | // BackwardsCompatibility3.3
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195 | #region Backwards compatible code (remove with 3.4)
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196 | if (Operators.Count == 0) InitializeOperators();
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197 | #endregion
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198 | RegisterEventHandlers();
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199 | }
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200 |
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201 | private void RegisterEventHandlers() {
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202 | SolutionCreator.BinaryVectorParameter.ActualNameChanged += new EventHandler(SolutionCreator_BinaryVectorParameter_ActualNameChanged);
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203 | KnapsackCapacityParameter.ValueChanged += new EventHandler(KnapsackCapacityParameter_ValueChanged);
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204 | WeightsParameter.ValueChanged += new EventHandler(WeightsParameter_ValueChanged);
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205 | WeightsParameter.Value.Reset += new EventHandler(WeightsValue_Reset);
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206 | ValuesParameter.ValueChanged += new EventHandler(ValuesParameter_ValueChanged);
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207 | ValuesParameter.Value.Reset += new EventHandler(ValuesValue_Reset);
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208 | PenaltyParameter.ValueChanged += new EventHandler(PenaltyParameter_ValueChanged);
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209 | }
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210 | private void ParameterizeSolutionCreator() {
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211 | if (SolutionCreator.LengthParameter.Value == null ||
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212 | SolutionCreator.LengthParameter.Value.Value != WeightsParameter.Value.Length)
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213 | SolutionCreator.LengthParameter.Value = new IntValue(WeightsParameter.Value.Length);
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214 | }
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215 | private void ParameterizeEvaluator() {
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216 | if (Evaluator is KnapsackEvaluator) {
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217 | KnapsackEvaluator knapsackEvaluator =
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218 | (KnapsackEvaluator)Evaluator;
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219 | knapsackEvaluator.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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220 | knapsackEvaluator.BinaryVectorParameter.Hidden = true;
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221 | knapsackEvaluator.KnapsackCapacityParameter.ActualName = KnapsackCapacityParameter.Name;
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222 | knapsackEvaluator.KnapsackCapacityParameter.Hidden = true;
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223 | knapsackEvaluator.WeightsParameter.ActualName = WeightsParameter.Name;
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224 | knapsackEvaluator.WeightsParameter.Hidden = true;
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225 | knapsackEvaluator.ValuesParameter.ActualName = ValuesParameter.Name;
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226 | knapsackEvaluator.ValuesParameter.Hidden = true;
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227 | knapsackEvaluator.PenaltyParameter.ActualName = PenaltyParameter.Name;
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228 | knapsackEvaluator.PenaltyParameter.Hidden = true;
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229 | }
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230 | }
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231 | private void ParameterizeAnalyzer() {
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232 | if (BestKnapsackSolutionAnalyzer != null) {
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233 | BestKnapsackSolutionAnalyzer.MaximizationParameter.ActualName = MaximizationParameter.Name;
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234 | BestKnapsackSolutionAnalyzer.MaximizationParameter.Hidden = true;
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235 | BestKnapsackSolutionAnalyzer.BestKnownQualityParameter.ActualName = BestKnownQualityParameter.Name;
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236 | BestKnapsackSolutionAnalyzer.BestKnownQualityParameter.Hidden = true;
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237 | BestKnapsackSolutionAnalyzer.BestKnownSolutionParameter.ActualName = BestKnownSolutionParameter.Name;
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238 | BestKnapsackSolutionAnalyzer.BestKnownSolutionParameter.Hidden = true;
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239 | BestKnapsackSolutionAnalyzer.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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240 | BestKnapsackSolutionAnalyzer.BinaryVectorParameter.Hidden = true;
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241 | BestKnapsackSolutionAnalyzer.KnapsackCapacityParameter.ActualName = KnapsackCapacityParameter.Name;
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242 | BestKnapsackSolutionAnalyzer.KnapsackCapacityParameter.Hidden = true;
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243 | BestKnapsackSolutionAnalyzer.WeightsParameter.ActualName = WeightsParameter.Name;
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244 | BestKnapsackSolutionAnalyzer.WeightsParameter.Hidden = true;
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245 | BestKnapsackSolutionAnalyzer.ValuesParameter.ActualName = ValuesParameter.Name;
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246 | BestKnapsackSolutionAnalyzer.ValuesParameter.Hidden = true;
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247 | }
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248 | }
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249 | private void InitializeOperators() {
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250 | Operators.Add(new KnapsackImprovementOperator());
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251 | Operators.Add(new KnapsackPathRelinker());
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252 | Operators.Add(new KnapsackSimultaneousPathRelinker());
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253 | Operators.Add(new HammingSimilarityCalculator());
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254 | Operators.Add(new QualitySimilarityCalculator());
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255 |
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256 | Operators.Add(new BestKnapsackSolutionAnalyzer());
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257 | Operators.Add(new PopulationSimilarityAnalyzer(Operators.OfType<ISolutionSimilarityCalculator>()));
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258 | ParameterizeAnalyzer();
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259 | foreach (IBinaryVectorOperator op in ApplicationManager.Manager.GetInstances<IBinaryVectorOperator>()) {
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260 | if (!(op is ISingleObjectiveMoveEvaluator) || (op is IKnapsackMoveEvaluator)) {
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261 | Operators.Add(op);
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262 | }
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263 | }
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264 | ParameterizeOperators();
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265 | InitializeMoveGenerators();
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266 | }
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267 | private void InitializeMoveGenerators() {
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268 | foreach (IOneBitflipMoveOperator op in Operators.OfType<IOneBitflipMoveOperator>()) {
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269 | if (op is IMoveGenerator) {
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270 | op.OneBitflipMoveParameter.ActualNameChanged += new EventHandler(OneBitflipMoveParameter_ActualNameChanged);
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271 | }
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272 | }
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273 | }
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274 | private void ParameterizeOperators() {
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275 | foreach (IBinaryVectorCrossover op in Operators.OfType<IBinaryVectorCrossover>()) {
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276 | op.ParentsParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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277 | op.ParentsParameter.Hidden = true;
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278 | op.ChildParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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279 | op.ChildParameter.Hidden = true;
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280 | }
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281 | foreach (IBinaryVectorManipulator op in Operators.OfType<IBinaryVectorManipulator>()) {
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282 | op.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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283 | op.BinaryVectorParameter.Hidden = true;
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284 | }
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285 | foreach (IBinaryVectorMoveOperator op in Operators.OfType<IBinaryVectorMoveOperator>()) {
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286 | op.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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287 | op.BinaryVectorParameter.Hidden = true;
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288 | }
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289 | foreach (IKnapsackMoveEvaluator op in Operators.OfType<IKnapsackMoveEvaluator>()) {
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290 | op.KnapsackCapacityParameter.ActualName = KnapsackCapacityParameter.Name;
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291 | op.KnapsackCapacityParameter.Hidden = true;
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292 | op.PenaltyParameter.ActualName = PenaltyParameter.Name;
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293 | op.PenaltyParameter.Hidden = true;
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294 | op.WeightsParameter.ActualName = WeightsParameter.Name;
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295 | op.WeightsParameter.Hidden = true;
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296 | op.ValuesParameter.ActualName = ValuesParameter.Name;
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297 | op.ValuesParameter.Hidden = true;
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298 | }
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299 | foreach (IBinaryVectorMultiNeighborhoodShakingOperator op in Operators.OfType<IBinaryVectorMultiNeighborhoodShakingOperator>()) {
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300 | op.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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301 | op.BinaryVectorParameter.Hidden = true;
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302 | }
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303 | foreach (ISingleObjectiveImprovementOperator op in Operators.OfType<ISingleObjectiveImprovementOperator>()) {
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304 | op.SolutionParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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305 | op.SolutionParameter.Hidden = true;
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306 | }
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307 | foreach (ISingleObjectivePathRelinker op in Operators.OfType<ISingleObjectivePathRelinker>()) {
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308 | op.ParentsParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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309 | op.ParentsParameter.Hidden = true;
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310 | }
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311 | foreach (ISolutionSimilarityCalculator op in Operators.OfType<ISolutionSimilarityCalculator>()) {
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312 | op.SolutionVariableName = SolutionCreator.BinaryVectorParameter.ActualName;
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313 | op.QualityVariableName = Evaluator.QualityParameter.ActualName;
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314 | }
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315 | }
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316 | #endregion
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317 |
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318 | private void InitializeRandomKnapsackInstance() {
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319 | System.Random rand = new System.Random();
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320 |
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321 | int itemCount = rand.Next(10, 100);
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322 | Weights = new IntArray(itemCount);
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323 | Values = new IntArray(itemCount);
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324 |
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325 | double totalWeight = 0;
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326 |
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327 | for (int i = 0; i < itemCount; i++) {
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328 | int value = rand.Next(1, 10);
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329 | int weight = rand.Next(1, 10);
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330 |
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331 | Values[i] = value;
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332 | Weights[i] = weight;
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333 | totalWeight += weight;
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334 | }
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335 |
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336 | int capacity = (int)Math.Round(0.7 * totalWeight);
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337 | KnapsackCapacity = new IntValue(capacity);
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338 | }
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339 | }
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340 | }
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