[3070] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[12009] | 3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[3070] | 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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[8720] | 25 | using HeuristicLab.Analysis;
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[3070] | 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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[12280] | 31 | using HeuristicLab.Optimization.Operators;
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[3070] | 32 | using HeuristicLab.Parameters;
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| 33 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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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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[4513] | 37 | [Item("Knapsack Problem", "Represents a Knapsack problem.")]
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[3070] | 38 | [Creatable("Problems")]
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| 39 | [StorableClass]
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[6938] | 40 | public sealed class KnapsackProblem : SingleObjectiveHeuristicOptimizationProblem<IKnapsackEvaluator, IBinaryVectorCreator>, IStorableContent {
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[4419] | 41 | public string Filename { get; set; }
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| 42 |
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[3070] | 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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[3109] | 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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[3787] | 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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[3070] | 59 | #endregion
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| 60 |
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| 61 | #region Properties
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[3109] | 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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[3787] | 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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[3667] | 82 | private BestKnapsackSolutionAnalyzer BestKnapsackSolutionAnalyzer {
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[6938] | 83 | get { return Operators.OfType<BestKnapsackSolutionAnalyzer>().FirstOrDefault(); }
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[3641] | 84 | }
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[3070] | 85 | #endregion
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| 86 |
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[6938] | 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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[3125] | 99 |
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[4098] | 100 | [StorableConstructor]
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[4118] | 101 | private KnapsackProblem(bool deserializing) : base(deserializing) { }
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[4722] | 102 | private KnapsackProblem(KnapsackProblem original, Cloner cloner)
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| 103 | : base(original, cloner) {
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[7351] | 104 | RegisterEventHandlers();
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[4722] | 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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[3166] | 109 | public KnapsackProblem()
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[6938] | 110 | : base(new KnapsackEvaluator(), new RandomBinaryVectorCreator()) {
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[3070] | 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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[3787] | 115 | Parameters.Add(new OptionalValueParameter<BinaryVector>("BestKnownSolution", "The best known solution of this Knapsack instance."));
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[3070] | 116 |
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[6938] | 117 | Maximization.Value = true;
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[6939] | 118 | MaximizationParameter.Hidden = true;
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[3125] | 119 |
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[6938] | 120 | SolutionCreator.BinaryVectorParameter.ActualName = "KnapsackSolution";
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| 121 |
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[3125] | 122 | InitializeRandomKnapsackInstance();
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[5287] | 123 |
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[3070] | 124 | ParameterizeSolutionCreator();
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| 125 | ParameterizeEvaluator();
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| 126 |
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[4098] | 127 | InitializeOperators();
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[7351] | 128 | RegisterEventHandlers();
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[3070] | 129 | }
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| 130 |
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| 131 | #region Events
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[6938] | 132 | protected override void OnSolutionCreatorChanged() {
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| 133 | base.OnSolutionCreatorChanged();
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[3641] | 134 | SolutionCreator.BinaryVectorParameter.ActualNameChanged += new EventHandler(SolutionCreator_BinaryVectorParameter_ActualNameChanged);
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[3070] | 135 | ParameterizeSolutionCreator();
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| 136 | ParameterizeEvaluator();
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[3667] | 137 | ParameterizeAnalyzer();
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[3070] | 138 | ParameterizeOperators();
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| 139 | }
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[6938] | 140 | protected override void OnEvaluatorChanged() {
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| 141 | base.OnEvaluatorChanged();
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[3070] | 142 | ParameterizeEvaluator();
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[3667] | 143 | ParameterizeAnalyzer();
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[3070] | 144 | }
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[6938] | 145 | private void SolutionCreator_BinaryVectorParameter_ActualNameChanged(object sender, EventArgs e) {
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[3070] | 146 | ParameterizeEvaluator();
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[3667] | 147 | ParameterizeAnalyzer();
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[6938] | 148 | ParameterizeOperators();
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[3070] | 149 | }
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[6938] | 150 | private void KnapsackCapacityParameter_ValueChanged(object sender, EventArgs e) {
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[3109] | 151 | ParameterizeEvaluator();
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[3667] | 152 | ParameterizeAnalyzer();
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[3070] | 153 | }
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[6938] | 154 | private void WeightsParameter_ValueChanged(object sender, EventArgs e) {
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[3109] | 155 | ParameterizeEvaluator();
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[3667] | 156 | ParameterizeAnalyzer();
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[3110] | 157 | ParameterizeSolutionCreator();
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[3111] | 158 |
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| 159 | WeightsParameter.Value.Reset += new EventHandler(WeightsValue_Reset);
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[3070] | 160 | }
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[6938] | 161 | private void WeightsValue_Reset(object sender, EventArgs e) {
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[3111] | 162 | ParameterizeSolutionCreator();
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[3463] | 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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[3111] | 166 | }
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[6938] | 167 | private void ValuesParameter_ValueChanged(object sender, EventArgs e) {
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[3109] | 168 | ParameterizeEvaluator();
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[3667] | 169 | ParameterizeAnalyzer();
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[3110] | 170 | ParameterizeSolutionCreator();
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[3111] | 171 |
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| 172 | ValuesParameter.Value.Reset += new EventHandler(ValuesValue_Reset);
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[3109] | 173 | }
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[6938] | 174 | private void ValuesValue_Reset(object sender, EventArgs e) {
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[3111] | 175 | ParameterizeSolutionCreator();
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[3463] | 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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[3111] | 179 | }
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[6938] | 180 | private void PenaltyParameter_ValueChanged(object sender, EventArgs e) {
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[3109] | 181 | ParameterizeEvaluator();
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| 182 | }
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[6938] | 183 | private void OneBitflipMoveParameter_ActualNameChanged(object sender, EventArgs e) {
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[3124] | 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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[3070] | 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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[4722] | 193 | private void AfterDeserialization() {
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[4118] | 194 | // BackwardsCompatibility3.3
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| 195 | #region Backwards compatible code (remove with 3.4)
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[6939] | 196 | if (Operators.Count == 0) InitializeOperators();
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[4118] | 197 | #endregion
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[7351] | 198 | RegisterEventHandlers();
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[4118] | 199 | }
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| 200 |
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[7351] | 201 | private void RegisterEventHandlers() {
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[3641] | 202 | SolutionCreator.BinaryVectorParameter.ActualNameChanged += new EventHandler(SolutionCreator_BinaryVectorParameter_ActualNameChanged);
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[3109] | 203 | KnapsackCapacityParameter.ValueChanged += new EventHandler(KnapsackCapacityParameter_ValueChanged);
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| 204 | WeightsParameter.ValueChanged += new EventHandler(WeightsParameter_ValueChanged);
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[3111] | 205 | WeightsParameter.Value.Reset += new EventHandler(WeightsValue_Reset);
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[3109] | 206 | ValuesParameter.ValueChanged += new EventHandler(ValuesParameter_ValueChanged);
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[3111] | 207 | ValuesParameter.Value.Reset += new EventHandler(ValuesValue_Reset);
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[3109] | 208 | PenaltyParameter.ValueChanged += new EventHandler(PenaltyParameter_ValueChanged);
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[3070] | 209 | }
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| 210 | private void ParameterizeSolutionCreator() {
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[5287] | 211 | if (SolutionCreator.LengthParameter.Value == null ||
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[3070] | 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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[6053] | 220 | knapsackEvaluator.BinaryVectorParameter.Hidden = true;
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[3109] | 221 | knapsackEvaluator.KnapsackCapacityParameter.ActualName = KnapsackCapacityParameter.Name;
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[6053] | 222 | knapsackEvaluator.KnapsackCapacityParameter.Hidden = true;
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[3070] | 223 | knapsackEvaluator.WeightsParameter.ActualName = WeightsParameter.Name;
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[6053] | 224 | knapsackEvaluator.WeightsParameter.Hidden = true;
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[3070] | 225 | knapsackEvaluator.ValuesParameter.ActualName = ValuesParameter.Name;
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[6053] | 226 | knapsackEvaluator.ValuesParameter.Hidden = true;
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[3070] | 227 | knapsackEvaluator.PenaltyParameter.ActualName = PenaltyParameter.Name;
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[6053] | 228 | knapsackEvaluator.PenaltyParameter.Hidden = true;
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[3070] | 229 | }
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| 230 | }
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[3667] | 231 | private void ParameterizeAnalyzer() {
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[8720] | 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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[3467] | 248 | }
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[3070] | 249 | private void InitializeOperators() {
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[8334] | 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 KnapsackSimilarityCalculator());
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[12280] | 254 | Operators.Add(new QualitySimilarityCalculator());
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| 255 | Operators.Add(new NoSimilarityCalculator());
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[8334] | 256 |
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[6938] | 257 | Operators.Add(new BestKnapsackSolutionAnalyzer());
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[12280] | 258 | Operators.Add(new PopulationSimilarityAnalyzer(Operators.OfType<ISolutionSimilarityCalculator>()));
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[3667] | 259 | ParameterizeAnalyzer();
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[3303] | 260 | foreach (IBinaryVectorOperator op in ApplicationManager.Manager.GetInstances<IBinaryVectorOperator>()) {
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| 261 | if (!(op is ISingleObjectiveMoveEvaluator) || (op is IKnapsackMoveEvaluator)) {
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[6938] | 262 | Operators.Add(op);
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[3127] | 263 | }
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[3070] | 264 | }
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[3303] | 265 | ParameterizeOperators();
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[3124] | 266 | InitializeMoveGenerators();
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[3070] | 267 | }
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[3124] | 268 | private void InitializeMoveGenerators() {
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| 269 | foreach (IOneBitflipMoveOperator op in Operators.OfType<IOneBitflipMoveOperator>()) {
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| 270 | if (op is IMoveGenerator) {
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| 271 | op.OneBitflipMoveParameter.ActualNameChanged += new EventHandler(OneBitflipMoveParameter_ActualNameChanged);
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| 272 | }
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| 273 | }
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| 274 | }
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[3070] | 275 | private void ParameterizeOperators() {
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| 276 | foreach (IBinaryVectorCrossover op in Operators.OfType<IBinaryVectorCrossover>()) {
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| 277 | op.ParentsParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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[6053] | 278 | op.ParentsParameter.Hidden = true;
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[3070] | 279 | op.ChildParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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[6053] | 280 | op.ChildParameter.Hidden = true;
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[3070] | 281 | }
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| 282 | foreach (IBinaryVectorManipulator op in Operators.OfType<IBinaryVectorManipulator>()) {
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| 283 | op.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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[6053] | 284 | op.BinaryVectorParameter.Hidden = true;
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[3070] | 285 | }
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[3124] | 286 | foreach (IBinaryVectorMoveOperator op in Operators.OfType<IBinaryVectorMoveOperator>()) {
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| 287 | op.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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[6053] | 288 | op.BinaryVectorParameter.Hidden = true;
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[3124] | 289 | }
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| 290 | foreach (IKnapsackMoveEvaluator op in Operators.OfType<IKnapsackMoveEvaluator>()) {
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| 291 | op.KnapsackCapacityParameter.ActualName = KnapsackCapacityParameter.Name;
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[6053] | 292 | op.KnapsackCapacityParameter.Hidden = true;
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[3124] | 293 | op.PenaltyParameter.ActualName = PenaltyParameter.Name;
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[6053] | 294 | op.PenaltyParameter.Hidden = true;
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[3124] | 295 | op.WeightsParameter.ActualName = WeightsParameter.Name;
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[6053] | 296 | op.WeightsParameter.Hidden = true;
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[3124] | 297 | op.ValuesParameter.ActualName = ValuesParameter.Name;
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[6053] | 298 | op.ValuesParameter.Hidden = true;
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[3124] | 299 | }
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[8334] | 300 | foreach (IBinaryVectorMultiNeighborhoodShakingOperator op in Operators.OfType<IBinaryVectorMultiNeighborhoodShakingOperator>()) {
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[6042] | 301 | op.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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[6053] | 302 | op.BinaryVectorParameter.Hidden = true;
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| 303 | }
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[8334] | 304 | foreach (ISingleObjectiveImprovementOperator op in Operators.OfType<ISingleObjectiveImprovementOperator>()) {
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| 305 | op.SolutionParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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| 306 | op.SolutionParameter.Hidden = true;
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| 307 | }
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| 308 | foreach (ISingleObjectivePathRelinker op in Operators.OfType<ISingleObjectivePathRelinker>()) {
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| 309 | op.ParentsParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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| 310 | op.ParentsParameter.Hidden = true;
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| 311 | }
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[12280] | 312 | foreach (ISolutionSimilarityCalculator op in Operators.OfType<ISolutionSimilarityCalculator>()) {
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[8334] | 313 | op.SolutionVariableName = SolutionCreator.BinaryVectorParameter.ActualName;
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| 314 | op.QualityVariableName = Evaluator.QualityParameter.ActualName;
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| 315 | }
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[3070] | 316 | }
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| 317 | #endregion
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[4098] | 318 |
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| 319 | private void InitializeRandomKnapsackInstance() {
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| 320 | System.Random rand = new System.Random();
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| 321 |
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| 322 | int itemCount = rand.Next(10, 100);
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| 323 | Weights = new IntArray(itemCount);
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| 324 | Values = new IntArray(itemCount);
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| 325 |
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| 326 | double totalWeight = 0;
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| 327 |
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| 328 | for (int i = 0; i < itemCount; i++) {
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| 329 | int value = rand.Next(1, 10);
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| 330 | int weight = rand.Next(1, 10);
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| 331 |
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| 332 | Values[i] = value;
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| 333 | Weights[i] = weight;
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| 334 | totalWeight += weight;
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| 335 | }
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| 336 |
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| 337 | int capacity = (int)Math.Round(0.7 * totalWeight);
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| 338 | KnapsackCapacity = new IntValue(capacity);
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| 339 | }
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[3070] | 340 | }
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| 341 | }
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