| 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using System.Collections.Generic;
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| 24 | using System.Linq;
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| 25 | using System.Drawing;
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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.Optimization;
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| 30 | using HeuristicLab.Parameters;
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| 31 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 32 | using HeuristicLab.PluginInfrastructure;
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| 33 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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| 34 | using HeuristicLab.Problems.DataAnalysis.Regression;
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| 35 |
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| 36 | namespace HeuristicLab.Problems.DataAnalysis.Regression.Symbolic {
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| 37 | [Item("SymbolicRegressionProblem", "Represents a symbolic regression problem.")]
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| 38 | [Creatable("Problems")]
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| 39 | [StorableClass]
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| 40 | public sealed class SymbolicRegressionProblem : RegressionProblem, ISingleObjectiveProblem {
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| 41 |
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| 42 | #region Parameter Properties
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| 43 | public ValueParameter<BoolValue> MaximizationParameter {
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| 44 | get { return (ValueParameter<BoolValue>)Parameters["Maximization"]; }
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| 45 | }
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| 46 | IParameter ISingleObjectiveProblem.MaximizationParameter {
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| 47 | get { return MaximizationParameter; }
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| 48 | }
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| 49 | public ValueParameter<SymbolicExpressionTreeCreator> SolutionCreatorParameter {
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| 50 | get { return (ValueParameter<SymbolicExpressionTreeCreator>)Parameters["SolutionCreator"]; }
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| 51 | }
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| 52 | IParameter IProblem.SolutionCreatorParameter {
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| 53 | get { return SolutionCreatorParameter; }
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| 54 | }
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| 55 | public ValueParameter<ISymbolicRegressionEvaluator> EvaluatorParameter {
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| 56 | get { return (ValueParameter<ISymbolicRegressionEvaluator>)Parameters["Evaluator"]; }
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| 57 | }
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| 58 | IParameter IProblem.EvaluatorParameter {
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| 59 | get { return EvaluatorParameter; }
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| 60 | }
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| 61 | public ValueParameter<ISymbolicExpressionGrammar> FunctionTreeGrammarParameter {
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| 62 | get { return (ValueParameter<ISymbolicExpressionGrammar>)Parameters["FunctionTreeGrammar"]; }
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| 63 | }
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| 64 | public ValueParameter<IntValue> MaxExpressionLengthParameter {
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| 65 | get { return (ValueParameter<IntValue>)Parameters["MaxExpressionLength"]; }
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| 66 | }
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| 67 | public ValueParameter<IntValue> MaxExpressionDepthParameter {
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| 68 | get { return (ValueParameter<IntValue>)Parameters["MaxExpressionDepth"]; }
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| 69 | }
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| 70 | public ValueParameter<DoubleValue> NumberOfEvaluatedNodesParameter {
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| 71 | get { return (ValueParameter<DoubleValue>)Parameters["NumberOfEvaluatedNodes"]; }
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| 72 | }
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| 73 | public OptionalValueParameter<ISingleObjectiveSolutionsVisualizer> VisualizerParameter {
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| 74 | get { return (OptionalValueParameter<ISingleObjectiveSolutionsVisualizer>)Parameters["Visualizer"]; }
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| 75 | }
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| 76 | IParameter IProblem.VisualizerParameter {
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| 77 | get { return VisualizerParameter; }
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| 78 | }
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| 79 | public ValueParameter<DoubleValue> BestKnownQualityParameter {
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| 80 | get { return (ValueParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
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| 81 | }
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| 82 | IParameter ISingleObjectiveProblem.BestKnownQualityParameter {
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| 83 | get { return BestKnownQualityParameter; }
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| 84 | }
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| 85 | #endregion
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| 86 |
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| 87 | #region Properties
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| 88 | public IntValue MaxExpressionLength {
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| 89 | get { return MaxExpressionLengthParameter.Value; }
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| 90 | set { MaxExpressionLengthParameter.Value = value; }
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| 91 | }
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| 92 | public IntValue MaxExpressionDepth {
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| 93 | get { return MaxExpressionDepthParameter.Value; }
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| 94 | set { MaxExpressionDepthParameter.Value = value; }
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| 95 | }
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| 96 | public SymbolicExpressionTreeCreator SolutionCreator {
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| 97 | get { return SolutionCreatorParameter.Value; }
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| 98 | set { SolutionCreatorParameter.Value = value; }
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| 99 | }
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| 100 | ISolutionCreator IProblem.SolutionCreator {
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| 101 | get { return SolutionCreatorParameter.Value; }
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| 102 | }
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| 103 | public ISymbolicRegressionEvaluator Evaluator {
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| 104 | get { return EvaluatorParameter.Value; }
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| 105 | set { EvaluatorParameter.Value = value; }
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| 106 | }
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| 107 | ISingleObjectiveEvaluator ISingleObjectiveProblem.Evaluator {
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| 108 | get { return EvaluatorParameter.Value; }
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| 109 | }
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| 110 | IEvaluator IProblem.Evaluator {
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| 111 | get { return EvaluatorParameter.Value; }
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| 112 | }
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| 113 | public ISymbolicExpressionGrammar FunctionTreeGrammar {
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| 114 | get { return FunctionTreeGrammarParameter.Value; }
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| 115 | }
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| 116 | public ISingleObjectiveSolutionsVisualizer Visualizer {
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| 117 | get { return VisualizerParameter.Value; }
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| 118 | set { VisualizerParameter.Value = value; }
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| 119 | }
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| 120 | ISolutionsVisualizer IProblem.Visualizer {
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| 121 | get { return VisualizerParameter.Value; }
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| 122 | }
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| 123 | public DoubleValue BestKnownQuality {
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| 124 | get { return BestKnownQualityParameter.Value; }
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| 125 | }
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| 126 | private List<ISymbolicExpressionTreeOperator> operators;
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| 127 | public IEnumerable<IOperator> Operators {
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| 128 | get { return operators.Cast<IOperator>(); }
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| 129 | }
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| 130 | #endregion
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| 131 |
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| 132 | public SymbolicRegressionProblem()
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| 133 | : base() {
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| 134 | SymbolicExpressionTreeCreator creator = new ProbabilisticTreeCreator();
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| 135 | var evaluator = new SymbolicRegressionMeanSquaredErrorEvaluator();
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| 136 | var grammar = new ArithmeticExpressionGrammar();
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| 137 | Parameters.Add(new ValueParameter<BoolValue>("Maximization", "Set to false as the error of the regression model should be minimized.", new BoolValue(false)));
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| 138 | Parameters.Add(new ValueParameter<SymbolicExpressionTreeCreator>("SolutionCreator", "The operator which should be used to create new symbolic regression solutions.", creator));
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| 139 | Parameters.Add(new ValueParameter<ISymbolicRegressionEvaluator>("Evaluator", "The operator which should be used to evaluate symbolic regression solutions.", evaluator));
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| 140 | Parameters.Add(new ValueParameter<DoubleValue>("BestKnownQuality", "The minimal error value that can be reached by symbolic regression models.", new DoubleValue(0)));
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| 141 | Parameters.Add(new ValueParameter<ISymbolicExpressionGrammar>("FunctionTreeGrammar", "The grammar that should be used for symbolic regression models.", grammar));
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| 142 | Parameters.Add(new ValueParameter<IntValue>("MaxExpressionLength", "Maximal length of the symbolic expression.", new IntValue(100)));
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| 143 | Parameters.Add(new ValueParameter<IntValue>("MaxExpressionDepth", "Maximal depth of the symbolic expression.", new IntValue(10)));
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| 144 | Parameters.Add(new ValueParameter<DoubleValue>("NumberOfEvaluatedNodes", "The total number of evaluated function tree nodes (for performance measurements.)", new DoubleValue()));
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| 145 | Parameters.Add(new ValueParameter<ISingleObjectiveSolutionsVisualizer>("Visualizer", "The operator which should be used to visualize artificial ant solutions.", null));
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| 146 |
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| 147 | creator.SymbolicExpressionTreeParameter.ActualName = "SymbolicRegressionModel";
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| 148 | evaluator.QualityParameter.ActualName = "TrainingMeanSquaredError";
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| 149 | ParameterizeSolutionCreator();
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| 150 | ParameterizeEvaluator();
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| 151 | ParameterizeVisualizer();
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| 152 |
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| 153 | Initialize();
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| 154 | }
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| 155 |
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| 156 | [StorableConstructor]
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| 157 | private SymbolicRegressionProblem(bool deserializing) : base() { }
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| 158 |
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| 159 | public override IDeepCloneable Clone(Cloner cloner) {
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| 160 | SymbolicRegressionProblem clone = (SymbolicRegressionProblem)base.Clone(cloner);
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| 161 | clone.Initialize();
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| 162 | return clone;
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| 163 | }
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| 164 |
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| 165 | #region Events
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| 166 | public event EventHandler SolutionCreatorChanged;
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| 167 | private void OnSolutionCreatorChanged() {
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| 168 | var changed = SolutionCreatorChanged;
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| 169 | if (changed != null)
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| 170 | changed(this, EventArgs.Empty);
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| 171 | }
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| 172 | public event EventHandler EvaluatorChanged;
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| 173 | private void OnEvaluatorChanged() {
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| 174 | var changed = EvaluatorChanged;
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| 175 | if (changed != null)
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| 176 | changed(this, EventArgs.Empty);
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| 177 | }
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| 178 | public event EventHandler VisualizerChanged;
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| 179 | private void OnVisualizerChanged() {
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| 180 | var changed = VisualizerChanged;
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| 181 | if (changed != null)
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| 182 | changed(this, EventArgs.Empty);
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| 183 | }
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| 184 |
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| 185 | public event EventHandler OperatorsChanged;
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| 186 | private void OnOperatorsChanged() {
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| 187 | var changed = OperatorsChanged;
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| 188 | if (changed != null)
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| 189 | changed(this, EventArgs.Empty);
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| 190 | }
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| 191 |
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| 192 | private void SolutionCreatorParameter_ValueChanged(object sender, EventArgs e) {
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| 193 | SolutionCreator.SymbolicExpressionTreeParameter.ActualNameChanged += new EventHandler(SolutionCreator_SymbolicExpressionTreeParameter_ActualNameChanged);
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| 194 | ParameterizeSolutionCreator();
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| 195 | ParameterizeEvaluator();
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| 196 | ParameterizeVisualizer();
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| 197 | ParameterizeOperators();
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| 198 | OnSolutionCreatorChanged();
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| 199 | }
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| 200 | private void SolutionCreator_SymbolicExpressionTreeParameter_ActualNameChanged(object sender, EventArgs e) {
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| 201 | ParameterizeEvaluator();
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| 202 | ParameterizeVisualizer();
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| 203 | ParameterizeOperators();
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| 204 | }
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| 205 | private void EvaluatorParameter_ValueChanged(object sender, EventArgs e) {
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| 206 | Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 207 | ParameterizeEvaluator();
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| 208 | ParameterizeVisualizer();
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| 209 | OnEvaluatorChanged();
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| 210 | }
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| 211 |
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| 212 | private void VisualizerParameter_ValueChanged(object sender, EventArgs e) {
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| 213 | ParameterizeVisualizer();
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| 214 | OnVisualizerChanged();
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| 215 | }
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| 216 |
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| 217 | private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) {
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| 218 | ParameterizeVisualizer();
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| 219 | }
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| 220 |
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| 221 | #endregion
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| 222 |
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| 223 | #region Helpers
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| 224 | [StorableHook(HookType.AfterDeserialization)]
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| 225 | private void Initialize() {
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| 226 | InitializeOperators();
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| 227 | SolutionCreatorParameter.ValueChanged += new EventHandler(SolutionCreatorParameter_ValueChanged);
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| 228 | SolutionCreator.SymbolicExpressionTreeParameter.ActualNameChanged += new EventHandler(SolutionCreator_SymbolicExpressionTreeParameter_ActualNameChanged);
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| 229 | EvaluatorParameter.ValueChanged += new EventHandler(EvaluatorParameter_ValueChanged);
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| 230 | Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 231 | VisualizerParameter.ValueChanged += new EventHandler(VisualizerParameter_ValueChanged);
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| 232 | }
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| 233 |
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| 234 | private void InitializeOperators() {
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| 235 | operators = new List<ISymbolicExpressionTreeOperator>();
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| 236 | operators.AddRange(ApplicationManager.Manager.GetInstances<ISymbolicExpressionTreeOperator>());
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| 237 | ParameterizeOperators();
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| 238 | }
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| 239 |
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| 240 | private void ParameterizeSolutionCreator() {
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| 241 | SolutionCreator.SymbolicExpressionGrammarParameter.ActualName = FunctionTreeGrammarParameter.Name;
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| 242 | SolutionCreator.MaxTreeHeightParameter.ActualName = MaxExpressionDepthParameter.Name;
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| 243 | SolutionCreator.MaxTreeSizeParameter.ActualName = MaxExpressionLengthParameter.Name;
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| 244 | }
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| 245 | private void ParameterizeEvaluator() {
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| 246 | Evaluator.FunctionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
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| 247 | Evaluator.SamplesStartParameter.ActualName = TrainingSamplesStartParameter.Name;
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| 248 | Evaluator.SamplesEndParameter.ActualName = TrainingSamplesEndParameter.Name;
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| 249 | }
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| 250 | private void ParameterizeVisualizer() {
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| 251 | if (Visualizer != null) {
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| 252 | //Visualizer.QualityParameter.ActualName = Evaluator.QualityParameter.ActualName;
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| 253 | //var antTrailVisualizer = Visualizer as IAntTrailVisualizer;
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| 254 | //if (antTrailVisualizer != null) {
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| 255 | // antTrailVisualizer.SymbolicExpressionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
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| 256 | // antTrailVisualizer.WorldParameter.ActualName = WorldParameter.Name;
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| 257 | // antTrailVisualizer.MaxTimeStepsParameter.ActualName = MaxTimeStepsParameter.Name;
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| 258 | //}
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| 259 | //var bestSymExpressionVisualizer = Visualizer as BestSymbolicExpressionTreeVisualizer;
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| 260 | //if (bestSymExpressionVisualizer != null) {
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| 261 | // bestSymExpressionVisualizer.SymbolicExpressionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
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| 262 | //}
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| 263 | }
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| 264 | }
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| 265 |
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| 266 | private void ParameterizeOperators() {
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| 267 | foreach (ISymbolicExpressionTreeOperator op in Operators.OfType<ISymbolicExpressionTreeOperator>()) {
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| 268 | op.MaxTreeHeightParameter.ActualName = MaxExpressionDepthParameter.Name;
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| 269 | op.MaxTreeSizeParameter.ActualName = MaxExpressionLengthParameter.Name;
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| 270 | op.SymbolicExpressionGrammarParameter.ActualName = FunctionTreeGrammarParameter.Name;
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| 271 | }
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| 272 | foreach (ISymbolicRegressionEvaluator op in Operators.OfType<ISymbolicRegressionEvaluator>()) {
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| 273 | op.FunctionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
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| 274 | op.DatasetParameter.ActualName = DatasetParameter.Name;
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| 275 | op.NumberOfEvaluatedNodesParameter.ActualName = NumberOfEvaluatedNodesParameter.Name;
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| 276 | op.TargetVariableParameter.ActualName = TargetVariableParameter.Name;
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| 277 | op.SamplesStartParameter.ActualName = TrainingSamplesStartParameter.Name;
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| 278 | op.SamplesEndParameter.ActualName = TrainingSamplesEndParameter.Name;
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| 279 | }
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| 280 | foreach (SymbolicExpressionTreeCrossover op in Operators.OfType<SymbolicExpressionTreeCrossover>()) {
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| 281 | op.ParentsParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
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| 282 | op.ChildParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
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| 283 | }
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| 284 | }
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| 285 | #endregion
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| 286 | }
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| 287 | }
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