1 | #region License Information
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2 |
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3 | /* HeuristicLab
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4 | * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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5 | *
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6 | * This file is part of HeuristicLab.
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7 | *
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8 | * HeuristicLab is free software: you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation, either version 3 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * HeuristicLab is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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20 | */
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21 |
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22 | #endregion
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23 |
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24 | using System;
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25 | using System.Linq;
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26 | using HEAL.Attic;
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27 | using HeuristicLab.Analysis;
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28 | using HeuristicLab.Common;
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29 | using HeuristicLab.Core;
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30 | using HeuristicLab.Data;
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31 | using HeuristicLab.Optimization;
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32 | using HeuristicLab.Optimization.Operators;
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33 | using HeuristicLab.Parameters;
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34 |
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35 | namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
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36 | [StorableType("A1B9F4C8-5E29-493C-A483-2AC68453BC63")]
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37 | public abstract class SymbolicExpressionTreeProblem : SingleObjectiveProblem<SymbolicExpressionTreeEncoding, ISymbolicExpressionTree> {
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38 | [Storable] protected ReferenceParameter<IntValue> TreeLengthRefParameter { get; private set; }
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39 | [Storable] protected ReferenceParameter<IntValue> TreeDepthRefParameter { get; private set; }
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40 | [Storable] protected ReferenceParameter<ISymbolicExpressionGrammar> GrammarRefParameter { get; private set; }
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41 | [Storable] public IResult<ISingleObjectiveSolutionContext<ISymbolicExpressionTree>> BestSolutionResult { get; private set; }
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42 |
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43 | public int TreeLength {
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44 | get => TreeLengthRefParameter.Value.Value;
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45 | set => TreeLengthRefParameter.Value.Value = value;
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46 | }
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47 |
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48 | public int TreeDepth {
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49 | get => TreeDepthRefParameter.Value.Value;
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50 | set => TreeDepthRefParameter.Value.Value = value;
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51 | }
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52 |
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53 | public ISymbolicExpressionGrammar Grammar {
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54 | get => GrammarRefParameter.Value;
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55 | set => GrammarRefParameter.Value = value;
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56 | }
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57 |
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58 | protected ISingleObjectiveSolutionContext<ISymbolicExpressionTree> BestSolution {
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59 | get => BestSolutionResult.Value;
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60 | set => BestSolutionResult.Value = value;
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61 | }
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62 |
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63 | // persistence
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64 | [StorableConstructor]
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65 | protected SymbolicExpressionTreeProblem(StorableConstructorFlag _) : base(_) { }
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66 | [StorableHook(HookType.AfterDeserialization)]
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67 | private void AfterDeserialization() {
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68 | RegisterEventHandlers();
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69 | }
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70 |
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71 | // cloning
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72 | protected SymbolicExpressionTreeProblem(SymbolicExpressionTreeProblem original, Cloner cloner)
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73 | : base(original, cloner) {
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74 | TreeLengthRefParameter = cloner.Clone(original.TreeLengthRefParameter);
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75 | TreeDepthRefParameter = cloner.Clone(original.TreeDepthRefParameter);
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76 | GrammarRefParameter = cloner.Clone(original.GrammarRefParameter);
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77 | BestSolutionResult = cloner.Clone(original.BestSolutionResult);
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78 | RegisterEventHandlers();
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79 | }
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80 |
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81 | protected SymbolicExpressionTreeProblem() : this(new SymbolicExpressionTreeEncoding()) { }
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82 | protected SymbolicExpressionTreeProblem(SymbolicExpressionTreeEncoding encoding)
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83 | : base(encoding) {
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84 | EncodingParameter.ReadOnly = true;
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85 | EvaluatorParameter.ReadOnly = true;
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86 | Parameters.Add(TreeLengthRefParameter = new ReferenceParameter<IntValue>("TreeLength", "The maximum amount of nodes.", Encoding.TreeLengthParameter));
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87 | Parameters.Add(TreeDepthRefParameter = new ReferenceParameter<IntValue>("TreeDepth", "The maximum depth of the tree.", Encoding.TreeDepthParameter));
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88 | Parameters.Add(GrammarRefParameter = new ReferenceParameter<ISymbolicExpressionGrammar>("Grammar", "The grammar that describes a valid tree.", Encoding.GrammarParameter));
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89 | Results.Add(BestSolutionResult = new Result<ISingleObjectiveSolutionContext<ISymbolicExpressionTree>>("Best Solution", "The best solution found so far."));
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90 |
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91 | // TODO: These should be added in the SingleObjectiveProblem base class (if they were accessible from there)
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92 | Operators.Add(new QualitySimilarityCalculator());
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93 | Operators.Add(new PopulationSimilarityAnalyzer(Operators.OfType<ISolutionSimilarityCalculator>()));
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94 |
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95 | Parameterize();
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96 | RegisterEventHandlers();
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97 | }
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98 |
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99 | public override void Analyze(ISingleObjectiveSolutionContext<ISymbolicExpressionTree>[] solutionContexts, IRandom random) {
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100 | base.Analyze(solutionContexts, random);
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101 | var best = GetBest(solutionContexts);
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102 | if (BestSolution == null || IsBetter(best, BestSolution))
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103 | BestSolution = best.Clone() as SingleObjectiveSolutionContext<ISymbolicExpressionTree>;
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104 | }
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105 |
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106 | protected sealed override void OnEvaluatorChanged() {
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107 | throw new InvalidOperationException("Evaluator may not change!");
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108 | }
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109 |
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110 | protected sealed override void OnEncodingChanged() {
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111 | throw new InvalidOperationException("Encoding may not change!");
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112 | }
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113 |
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114 | protected override void ParameterizeOperators() {
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115 | base.ParameterizeOperators();
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116 | Parameterize();
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117 | }
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118 |
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119 | private void Parameterize() {
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120 | // TODO: this is done in base class as well (but operators are added at this level of the hierarchy)
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121 | foreach (var similarityCalculator in Operators.OfType<ISolutionSimilarityCalculator>()) {
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122 | similarityCalculator.SolutionVariableName = Encoding.Name;
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123 | similarityCalculator.QualityVariableName = Evaluator.QualityParameter.ActualName;
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124 | }
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125 | }
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126 | private void RegisterEventHandlers() {
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127 | IntValueParameterChangeHandler.Create(TreeLengthRefParameter, TreeLengthOnChanged);
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128 | IntValueParameterChangeHandler.Create(TreeDepthRefParameter, TreeDepthOnChanged);
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129 | ParameterChangeHandler<ISymbolicExpressionGrammar>.Create(GrammarRefParameter, GrammarOnChanged);
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130 | }
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131 |
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132 | protected virtual void TreeLengthOnChanged() { }
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133 | protected virtual void TreeDepthOnChanged() { }
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134 | protected virtual void GrammarOnChanged() { }
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135 | }
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136 | }
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