1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 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.Linq;
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24 | using HEAL.Attic;
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25 | using HeuristicLab.Common;
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26 | using HeuristicLab.Core;
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27 | using HeuristicLab.Data;
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28 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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29 | using HeuristicLab.Optimization;
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30 | using HeuristicLab.Parameters;
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31 | using HeuristicLab.PluginInfrastructure;
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32 | using HeuristicLab.Problems.Instances;
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33 | using HeuristicLab.Problems.Instances.DataAnalysis;
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34 |
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35 | namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Regression {
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36 | [StorableType("7464E84B-65CC-440A-91F0-9FA920D730F9")]
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37 | [Item(Name = "Structured Symbolic Regression Single Objective Problem (single-objective)", Description = "A problem with a structural definition and unfixed subfunctions.")]
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38 | [Creatable(CreatableAttribute.Categories.GeneticProgrammingProblems, Priority = 150)]
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39 | public class StructuredSymbolicRegressionSingleObjectiveProblem : SingleObjectiveBasicProblem<MultiEncoding>, IRegressionProblem, IProblemInstanceConsumer<IRegressionProblemData> {
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40 |
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41 | #region Constants
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42 | private const string TreeEvaluatorParameterName = "TreeEvaluator";
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43 | private const string ProblemDataParameterName = "ProblemData";
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44 | private const string StructureTemplateParameterName = "Structure Template";
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45 | private const string InterpreterParameterName = "Interpreter";
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46 | private const string EstimationLimitsParameterName = "EstimationLimits";
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47 | private const string BestTrainingSolutionParameterName = "Best Training Solution";
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48 | private const string ApplyLinearScalingParameterName = "Apply Linear Scaling";
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49 | private const string OptimizeParametersParameterName = "Optimize Parameters";
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50 |
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51 | private const string SymbolicExpressionTreeName = "SymbolicExpressionTree";
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52 |
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53 | private const string StructureTemplateDescriptionText =
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54 | "Enter your expression as string in infix format into the empty input field.\n" +
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55 | "By checking the \"Apply Linear Scaling\" checkbox you can add the relevant scaling terms to your expression.\n" +
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56 | "After entering the expression click parse to build the tree.\n" +
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57 | "To edit the defined sub-functions, click on the corresponding-colored node in the tree view.\n" +
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58 | "Check the info box besides the input field for more information.";
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59 | #endregion
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60 |
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61 | #region Parameters
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62 | public IConstrainedValueParameter<SymbolicRegressionSingleObjectiveEvaluator> TreeEvaluatorParameter => (IConstrainedValueParameter<SymbolicRegressionSingleObjectiveEvaluator>)Parameters[TreeEvaluatorParameterName];
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63 | public IValueParameter<IRegressionProblemData> ProblemDataParameter => (IValueParameter<IRegressionProblemData>)Parameters[ProblemDataParameterName];
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64 | public IFixedValueParameter<StructureTemplate> StructureTemplateParameter => (IFixedValueParameter<StructureTemplate>)Parameters[StructureTemplateParameterName];
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65 | public IValueParameter<ISymbolicDataAnalysisExpressionTreeInterpreter> InterpreterParameter => (IValueParameter<ISymbolicDataAnalysisExpressionTreeInterpreter>)Parameters[InterpreterParameterName];
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66 | public IFixedValueParameter<DoubleLimit> EstimationLimitsParameter => (IFixedValueParameter<DoubleLimit>)Parameters[EstimationLimitsParameterName];
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67 | public IResultParameter<ISymbolicRegressionSolution> BestTrainingSolutionParameter => (IResultParameter<ISymbolicRegressionSolution>)Parameters[BestTrainingSolutionParameterName];
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68 |
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69 | public IFixedValueParameter<BoolValue> ApplyLinearScalingParameter => (IFixedValueParameter<BoolValue>)Parameters[ApplyLinearScalingParameterName];
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70 | public IFixedValueParameter<BoolValue> OptimizeParametersParameter => (IFixedValueParameter<BoolValue>)Parameters[OptimizeParametersParameterName];
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71 | #endregion
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72 |
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73 | #region Properties
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74 |
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75 | public IRegressionProblemData ProblemData {
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76 | get => ProblemDataParameter.Value;
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77 | set {
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78 | ProblemDataParameter.Value = value;
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79 | ProblemDataChanged?.Invoke(this, EventArgs.Empty);
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80 | }
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81 | }
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82 |
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83 | public SymbolicRegressionSingleObjectiveEvaluator TreeEvaluator => TreeEvaluatorParameter.Value;
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84 |
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85 | public StructureTemplate StructureTemplate => StructureTemplateParameter.Value;
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86 |
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87 | public ISymbolicDataAnalysisExpressionTreeInterpreter Interpreter => InterpreterParameter.Value;
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88 |
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89 | IParameter IDataAnalysisProblem.ProblemDataParameter => ProblemDataParameter;
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90 | IDataAnalysisProblemData IDataAnalysisProblem.ProblemData => ProblemData;
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91 |
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92 | public DoubleLimit EstimationLimits => EstimationLimitsParameter.Value;
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93 |
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94 | public bool ApplyLinearScaling {
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95 | get => ApplyLinearScalingParameter.Value.Value;
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96 | set => ApplyLinearScalingParameter.Value.Value = value;
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97 | }
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98 |
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99 | public bool OptimizeParameters {
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100 | get => OptimizeParametersParameter.Value.Value;
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101 | set => OptimizeParametersParameter.Value.Value = value;
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102 | }
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103 |
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104 | public override bool Maximization => false;
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105 | #endregion
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106 |
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107 | #region EventHandlers
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108 | public event EventHandler ProblemDataChanged;
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109 | #endregion
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110 |
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111 | #region Constructors & Cloning
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112 | public StructuredSymbolicRegressionSingleObjectiveProblem() {
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113 | var provider = new PhysicsInstanceProvider();
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114 | var descriptor = new SheetBendingProcess();
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115 | var problemData = provider.LoadData(descriptor);
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116 | var shapeConstraintProblemData = new ShapeConstrainedRegressionProblemData(problemData);
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117 |
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118 | var structureTemplate = new StructureTemplate();
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119 |
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120 | var evaluators = new ItemSet<SymbolicRegressionSingleObjectiveEvaluator>(
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121 | ApplicationManager.Manager.GetInstances<SymbolicRegressionSingleObjectiveEvaluator>()
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122 | .Where(x => x.Maximization == Maximization));
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123 |
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124 | Parameters.Add(new ConstrainedValueParameter<SymbolicRegressionSingleObjectiveEvaluator>(
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125 | TreeEvaluatorParameterName,
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126 | evaluators,
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127 | evaluators.First()));
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128 |
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129 | Parameters.Add(new ValueParameter<IRegressionProblemData>(
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130 | ProblemDataParameterName,
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131 | shapeConstraintProblemData));
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132 |
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133 | Parameters.Add(new FixedValueParameter<StructureTemplate>(
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134 | StructureTemplateParameterName,
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135 | StructureTemplateDescriptionText,
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136 | structureTemplate));
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137 |
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138 | Parameters.Add(new FixedValueParameter<BoolValue>(
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139 | ApplyLinearScalingParameterName, new BoolValue(true)
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140 | ));
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141 |
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142 | Parameters.Add(new FixedValueParameter<BoolValue>(
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143 | OptimizeParametersParameterName, new BoolValue(true)
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144 | ));
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145 |
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146 | Parameters.Add(new ValueParameter<ISymbolicDataAnalysisExpressionTreeInterpreter>(
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147 | InterpreterParameterName,
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148 | new SymbolicDataAnalysisExpressionTreeBatchInterpreter()) { Hidden = true });
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149 | Parameters.Add(new FixedValueParameter<DoubleLimit>(
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150 | EstimationLimitsParameterName,
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151 | new DoubleLimit(double.NegativeInfinity, double.PositiveInfinity)) { Hidden = true });
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152 | Parameters.Add(new ResultParameter<ISymbolicRegressionSolution>(BestTrainingSolutionParameterName, "") { Hidden = true });
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153 |
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154 | this.EvaluatorParameter.Hidden = true;
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155 |
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156 | Operators.Add(new SymbolicDataAnalysisVariableFrequencyAnalyzer());
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157 | Operators.Add(new MinAverageMaxSymbolicExpressionTreeLengthAnalyzer());
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158 | Operators.Add(new SymbolicExpressionSymbolFrequencyAnalyzer());
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159 |
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160 | RegisterEventHandlers();
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161 |
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162 | StructureTemplate.ApplyLinearScaling = ApplyLinearScaling;
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163 | StructureTemplate.Template =
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164 | "(" +
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165 | "(210000 / (210000 + h)) * ((sigma_y * t * t) / (wR * Rt * t)) + " +
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166 | "PlasticHardening(_) - Elasticity(_)" +
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167 | ")" +
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168 | " * C(_)";
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169 | }
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170 |
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171 | public StructuredSymbolicRegressionSingleObjectiveProblem(StructuredSymbolicRegressionSingleObjectiveProblem original, Cloner cloner) : base(original, cloner) {
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172 | RegisterEventHandlers();
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173 | }
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174 |
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175 | public override IDeepCloneable Clone(Cloner cloner) =>
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176 | new StructuredSymbolicRegressionSingleObjectiveProblem(this, cloner);
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177 |
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178 | [StorableConstructor]
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179 | protected StructuredSymbolicRegressionSingleObjectiveProblem(StorableConstructorFlag _) : base(_) { }
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180 |
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181 |
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182 | [StorableHook(HookType.AfterDeserialization)]
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183 | private void AfterDeserialization() {
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184 | if (!Parameters.ContainsKey(ApplyLinearScalingParameterName)) {
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185 | Parameters.Add(new FixedValueParameter<BoolValue>(ApplyLinearScalingParameterName, new BoolValue(StructureTemplate.ApplyLinearScaling)));
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186 | }
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187 |
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188 | if (!Parameters.ContainsKey(OptimizeParametersParameterName)) {
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189 | Parameters.Add(new FixedValueParameter<BoolValue>(OptimizeParametersParameterName, new BoolValue(false)));
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190 | }
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191 |
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192 | RegisterEventHandlers();
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193 | }
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194 |
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195 | #endregion
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196 |
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197 | private void RegisterEventHandlers() {
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198 | if (StructureTemplate != null) {
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199 | StructureTemplate.Changed += OnTemplateChanged;
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200 | }
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201 |
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202 | ProblemDataParameter.ValueChanged += ProblemDataParameterValueChanged;
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203 | ApplyLinearScalingParameter.Value.ValueChanged += (o, e) => StructureTemplate.ApplyLinearScaling = ApplyLinearScaling;
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204 | OptimizeParametersParameter.Value.ValueChanged += (o, e) => {
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205 | if (OptimizeParameters) ApplyLinearScaling = true;
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206 | };
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207 |
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208 | }
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209 |
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210 | private void ProblemDataParameterValueChanged(object sender, EventArgs e) {
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211 | StructureTemplate.Reset();
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212 | // InfoBox for Reset?
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213 | }
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214 |
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215 | private void OnTemplateChanged(object sender, EventArgs args) {
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216 | ApplyLinearScaling = StructureTemplate.ApplyLinearScaling;
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217 | SetupEncoding();
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218 | }
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219 |
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220 | private void SetupEncoding() {
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221 | foreach (var e in Encoding.Encodings.ToArray())
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222 | Encoding.Remove(e);
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223 |
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224 | foreach (var subFunction in StructureTemplate.SubFunctions) {
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225 | subFunction.SetupVariables(ProblemData.AllowedInputVariables);
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226 | // prevent the same encoding twice
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227 | if (Encoding.Encodings.Any(x => x.Name == subFunction.Name)) continue;
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228 |
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229 | var encoding = new SymbolicExpressionTreeEncoding(
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230 | subFunction.Name,
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231 | subFunction.Grammar,
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232 | subFunction.MaximumSymbolicExpressionTreeLength,
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233 | subFunction.MaximumSymbolicExpressionTreeDepth);
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234 | Encoding.Add(encoding);
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235 | }
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236 |
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237 | //set multi manipulator as default manipulator for all encoding parts
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238 | var manipulator = (IParameterizedItem)Encoding.Operators.OfType<MultiEncodingManipulator>().FirstOrDefault();
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239 | if (manipulator != null) {
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240 | foreach (var param in manipulator.Parameters.OfType<ConstrainedValueParameter<IManipulator>>()) {
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241 | var m = param.ValidValues.OfType<MultiSymbolicExpressionTreeManipulator>().FirstOrDefault();
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242 | param.Value = m == null ? param.ValidValues.First() : m;
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243 | }
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244 | }
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245 | }
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246 |
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247 | public override void Analyze(Individual[] individuals, double[] qualities, ResultCollection results, IRandom random) {
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248 | base.Analyze(individuals, qualities, results, random);
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249 |
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250 | var best = GetBestIndividual(individuals, qualities).Item1;
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251 |
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252 | if (!results.ContainsKey(BestTrainingSolutionParameter.ActualName)) {
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253 | results.Add(new Result(BestTrainingSolutionParameter.ActualName, typeof(SymbolicRegressionSolution)));
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254 | }
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255 |
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256 | var tree = (ISymbolicExpressionTree)best[SymbolicExpressionTreeName];
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257 | var model = new SymbolicRegressionModel(ProblemData.TargetVariable, tree, Interpreter);
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258 | var solution = model.CreateRegressionSolution(ProblemData);
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259 |
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260 | results[BestTrainingSolutionParameter.ActualName].Value = solution;
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261 | }
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262 |
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263 |
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264 | public override double Evaluate(Individual individual, IRandom random) {
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265 | var templateTree = StructureTemplate.Tree;
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266 | if (templateTree == null)
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267 | throw new ArgumentException("No structure template defined!");
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268 |
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269 | var tree = BuildTree(templateTree, individual);
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270 |
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271 | // NMSEConstraintsEvaluator sets linear scaling terms itself
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272 | if (StructureTemplate.ApplyLinearScaling && !(TreeEvaluator is NMSESingleObjectiveConstraintsEvaluator)) {
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273 | AdjustLinearScalingParams(ProblemData, tree, Interpreter);
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274 | }
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275 |
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276 | individual[SymbolicExpressionTreeName] = tree;
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277 |
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278 | return TreeEvaluator.Evaluate(
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279 | tree, ProblemData,
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280 | ProblemData.TrainingIndices,
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281 | Interpreter,
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282 | StructureTemplate.ApplyLinearScaling,
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283 | EstimationLimits.Lower,
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284 | EstimationLimits.Upper);
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285 | }
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286 |
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287 | private static ISymbolicExpressionTree BuildTree(ISymbolicExpressionTree template, Individual individual) {
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288 | var resolvedTree = (ISymbolicExpressionTree)template.Clone();
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289 | // build main tree
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290 | foreach (var subFunctionTreeNode in resolvedTree.IterateNodesPrefix().OfType<SubFunctionTreeNode>()) {
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291 | var subFunctionTree = individual.SymbolicExpressionTree(subFunctionTreeNode.Name);
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292 |
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293 | // extract function tree
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294 | var subTree = subFunctionTree.Root.GetSubtree(0) // StartSymbol
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295 | .GetSubtree(0); // First Symbol
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296 | subTree = (ISymbolicExpressionTreeNode)subTree.Clone();
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297 | subFunctionTreeNode.AddSubtree(subTree);
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298 | }
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299 | return resolvedTree;
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300 | }
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301 |
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302 | private static void AdjustLinearScalingParams(IRegressionProblemData problemData, ISymbolicExpressionTree tree, ISymbolicDataAnalysisExpressionTreeInterpreter interpreter) {
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303 | var offsetNode = tree.Root.GetSubtree(0).GetSubtree(0);
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304 | var scalingNode = offsetNode.Subtrees.Where(x => !(x is NumberTreeNode)).First();
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305 |
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306 | var offsetNumberNode = (NumberTreeNode)offsetNode.Subtrees.Where(x => x is NumberTreeNode).First();
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307 | var scalingNumberNode = (NumberTreeNode)scalingNode.Subtrees.Where(x => x is NumberTreeNode).First();
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308 |
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309 | var estimatedValues = interpreter.GetSymbolicExpressionTreeValues(tree, problemData.Dataset, problemData.TrainingIndices);
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310 | var targetValues = problemData.Dataset.GetDoubleValues(problemData.TargetVariable, problemData.TrainingIndices);
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311 |
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312 | OnlineLinearScalingParameterCalculator.Calculate(estimatedValues, targetValues, out double a, out double b, out OnlineCalculatorError error);
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313 | if (error == OnlineCalculatorError.None) {
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314 | offsetNumberNode.Value = a;
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315 | scalingNumberNode.Value = b;
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316 | }
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317 | }
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318 |
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319 |
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320 |
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321 |
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322 |
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323 |
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324 | public void Load(IRegressionProblemData data) {
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325 | ProblemData = data;
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326 | }
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327 | }
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328 | }
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