1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Collections.ObjectModel;
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4 | using System.Linq;
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5 | using System.Threading;
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6 | using HEAL.Attic;
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7 | using HeuristicLab.Analysis;
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8 | using HeuristicLab.Common;
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9 | using HeuristicLab.Core;
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10 | using HeuristicLab.Data;
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11 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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12 | using HeuristicLab.Optimization;
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13 | using HeuristicLab.Optimization.Operators;
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14 | using HeuristicLab.Parameters;
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15 |
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16 | namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Regression {
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17 | [StorableType("4318C6BD-E0A1-45FE-AC30-96E7F73B51FB")]
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18 | public class SymbolicRegressionConstraintAnalyzer : SymbolicDataAnalysisAnalyzer, ISymbolicExpressionTreeAnalyzer {
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19 | private const string ConstraintViolationsResultName = "Constraint Violations";
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20 | private const string ProblemDataParameterName = "ProblemData";
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21 | private const string ConstraintViolationParameterName = "ConstraintViolations";
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22 | private const string PenalityMultiplierParameterName = "ConstraintsPenalityMultiplier";
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23 | private const string PenalityMultiplierResultParameterName = "PenalityMultiplierResultParameter";
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24 | private const string StepSizeParameterName = "Step Size";
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25 |
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26 | #region parameter properties
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27 |
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28 | public ILookupParameter<IRegressionProblemData> RegressionProblemDataParameter =>
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29 | (ILookupParameter<IRegressionProblemData>) Parameters[ProblemDataParameterName];
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30 |
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31 | public IResultParameter<DataTable> ConstraintViolationParameter =>
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32 | (IResultParameter<DataTable>) Parameters[ConstraintViolationParameterName];
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33 |
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34 | public ILookupParameter<DoubleValue> PenalityMultiplierParameter =>
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35 | (ILookupParameter<DoubleValue>)Parameters[PenalityMultiplierParameterName];
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36 | public IValueParameter<IntValue> StepSizeParameter =>
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37 | (IValueParameter<IntValue>)Parameters[StepSizeParameterName];
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38 |
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39 | public IResultParameter<DataTable> PenalityMultiplierResultParameter =>
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40 | (IResultParameter<DataTable>)Parameters[PenalityMultiplierResultParameterName];
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41 |
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42 | #endregion
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43 |
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44 | public override bool EnabledByDefault => false;
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45 | public static int Iterations { get; set; } = 0;
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46 |
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47 | [StorableConstructor]
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48 | protected SymbolicRegressionConstraintAnalyzer(StorableConstructorFlag _) : base(_) { }
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49 |
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50 | protected SymbolicRegressionConstraintAnalyzer(SymbolicRegressionConstraintAnalyzer original, Cloner cloner) :
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51 | base(original, cloner) { }
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52 |
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53 | public override IDeepCloneable Clone(Cloner cloner) {
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54 | return new SymbolicRegressionConstraintAnalyzer(this, cloner);
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55 | }
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56 |
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57 | public SymbolicRegressionConstraintAnalyzer() {
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58 | Parameters.Add(new LookupParameter<IRegressionProblemData>(ProblemDataParameterName,
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59 | "The problem data of the symbolic data analysis problem."));
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60 | Parameters.Add(new ResultParameter<DataTable>(ConstraintViolationParameterName,
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61 | "Shows the number of constraint violations!"));
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62 | Parameters.Add(new LookupParameter<DoubleValue>(PenalityMultiplierParameterName,
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63 | "Lookup parameter for the penality multiplier.", "PenalityMultiplier"));
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64 | Parameters.Add(new ResultParameter<DataTable>(PenalityMultiplierResultParameterName,
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65 | "Shows the behavior of the penality multiplier."));
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66 | Parameters.Add(new ValueParameter<IntValue>(StepSizeParameterName,
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67 | "Defines the step size for the increasing penality multiplier.", new IntValue(1)));
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68 |
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69 | ConstraintViolationParameter.DefaultValue = new DataTable(ConstraintViolationParameterName) {
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70 | VisualProperties =
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71 | {
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72 | XAxisTitle = "Generations",
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73 | YAxisTitle = "Constraint Violations"
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74 | }
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75 | };
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76 |
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77 | PenalityMultiplierResultParameter.DefaultValue = new DataTable(PenalityMultiplierResultParameterName)
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78 | {
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79 | VisualProperties =
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80 | {
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81 | XAxisTitle = "Generations",
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82 | YAxisTitle = "Penality Multiplier"
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83 | }
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84 | };
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85 | }
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86 |
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87 | public override void InitializeState()
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88 | {
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89 | Iterations = 0;
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90 | base.InitializeState();
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91 | }
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92 |
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93 | public override void ClearState()
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94 | {
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95 | Iterations = 0;
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96 | base.ClearState();
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97 | }
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98 |
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99 |
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100 | [StorableHook(HookType.AfterDeserialization)]
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101 | private void AfterDeserialization() {
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102 | if (!Parameters.ContainsKey(PenalityMultiplierParameterName))
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103 | Parameters.Add(new LookupParameter<DoubleValue>(PenalityMultiplierParameterName,
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104 | "Lookup parameter for the penality multiplier.", "PenalityMultiplier"));
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105 |
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106 | if (!Parameters.ContainsKey(PenalityMultiplierResultParameterName))
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107 | {
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108 | Parameters.Add(new ResultParameter<DataTable>(PenalityMultiplierResultParameterName,
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109 | "Shows the behavior of the penality multiplier."));
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110 |
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111 | PenalityMultiplierResultParameter.DefaultValue = new DataTable(PenalityMultiplierResultParameterName)
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112 | {
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113 | VisualProperties =
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114 | {
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115 | XAxisTitle = "Generations",
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116 | YAxisTitle = "Penality Multiplier"
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117 | }
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118 | };
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119 | }
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120 |
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121 | if (!Parameters.ContainsKey(StepSizeParameterName))
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122 | Parameters.Add(new ValueParameter<IntValue>(StepSizeParameterName,
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123 | "Defines the step size for the increasing penality multiplier.", new IntValue(1)));
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124 |
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125 | }
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126 |
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127 | public override IOperation Apply()
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128 | {
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129 | Iterations++;
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130 | var rowName = "GeneralizedExponentialDiscreteDoubleValueModifier";
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131 | var stepSize = StepSizeParameter?.Value?.Value ?? 1;
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132 | var penalityMultiplier = new DoubleValue(LinearDiscreteDoubleValueModifier.Apply(0, 0.1, 1.0, (int)(Iterations / stepSize) * stepSize, 0, 1000));
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133 | PenalityMultiplierParameter.ActualValue = penalityMultiplier;
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134 | //GeneralizedExponentialDiscreteDoubleValueModifier
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135 | //QuadraticDiscreteDoubleValueModifier
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136 | //LinearDiscreteDoubleValueModifier
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137 |
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138 | var problemData = RegressionProblemDataParameter.ActualValue;
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139 | var trees = SymbolicExpressionTreeParameter.ActualValue;
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140 |
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141 | var results = ResultCollectionParameter.ActualValue;
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142 | var constraints = problemData.IntervalConstraints.EnabledConstraints;
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143 | var variableRanges = problemData.VariableRanges.GetReadonlyDictionary();
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144 | var newDataTable = ConstraintViolationParameter.ActualValue;
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145 |
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146 | if (newDataTable.Rows.Count == 0)
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147 | foreach (var constraint in constraints)
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148 | newDataTable.Rows.Add(new DataRow(constraint.Expression));
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149 |
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150 | var interpreter = new IntervalInterpreter();
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151 | foreach (var constraint in constraints) {
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152 | var violations = trees.Select(tree => ConstraintSatisfied(constraint, interpreter, variableRanges, tree, out double error))
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153 | .Count(satisfied => !satisfied);
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154 | newDataTable.Rows[constraint.Expression].Values.Add(violations);
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155 | }
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156 |
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157 | var penalityDataTable = PenalityMultiplierResultParameter.ActualValue;
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158 | if (penalityDataTable.Rows.Count == 0)
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159 | penalityDataTable.Rows.Add(new DataRow(rowName));
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160 | penalityDataTable.Rows[rowName].Values.Add(penalityMultiplier.Value);
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161 |
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162 | return base.Apply();
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163 | }
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164 |
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165 | public static bool ConstraintSatisfied(IntervalConstraint constraint,
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166 | IntervalInterpreter intervalInterpreter,
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167 | IReadOnlyDictionary<string, Interval> variableRanges,
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168 | ISymbolicExpressionTree solution,
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169 | out double error) {
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170 | if (constraint.Variable != null && !variableRanges.ContainsKey(constraint.Variable))
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171 | throw new
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172 | ArgumentException($"The given variable {constraint.Variable} in the constraint does not exists in the model.",
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173 | nameof(IntervalConstraintsParser));
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174 |
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175 | Interval resultInterval;
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176 |
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177 | // create new variable ranges for defined regions
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178 | IDictionary<string, Interval> regionRanges = new Dictionary<string, Interval>();
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179 | foreach (var kvp in variableRanges)
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180 | {
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181 | if (kvp.Key != constraint.Target && constraint.Regions.TryGetValue(kvp.Key, out Interval val))
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182 | {
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183 | regionRanges.Add(kvp.Key, val);
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184 | }
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185 | else
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186 | {
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187 | regionRanges.Add(kvp);
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188 | }
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189 | }
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190 |
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191 | // calculate result interval
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192 | if (!constraint.IsDerivative) {
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193 | resultInterval = intervalInterpreter.GetSymbolicExpressionTreeInterval(solution, new ReadOnlyDictionary<string, Interval>(regionRanges), 0);
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194 | }
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195 | else {
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196 | var tree = solution;
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197 | for (var i = 0; i < constraint.NumberOfDerivations; ++i) {
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198 | if (!IntervalInterpreter.IsCompatible(tree) || !DerivativeCalculator.IsCompatible(tree))
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199 | throw new ArgumentException("Cube, Root, Power Symbols are not supported.");
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200 | tree = DerivativeCalculator.Derive(tree, constraint.Variable);
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201 | }
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202 |
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203 | resultInterval = intervalInterpreter.GetSymbolicExpressionTreeInterval(tree, new ReadOnlyDictionary<string, Interval>(regionRanges), 0);
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204 | }
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205 |
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206 | error = 0.0;
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207 | bool satisfied = true;
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208 | if(!constraint.Interval.Contains(resultInterval.LowerBound))
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209 | {
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210 | satisfied = false;
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211 | error += Math.Abs(resultInterval.LowerBound - constraint.Interval.LowerBound);
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212 | }
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213 |
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214 | if (!constraint.Interval.Contains(resultInterval.UpperBound))
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215 | {
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216 | satisfied = false;
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217 | error += Math.Abs(resultInterval.UpperBound - constraint.Interval.UpperBound);
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218 | }
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219 |
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220 | error *= constraint.Weight;
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221 |
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222 | //var satisfied = constraint.Interval.Contains(resultInterval);
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223 | return satisfied;
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224 | }
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225 |
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226 | public static bool ConstraintsSatisfied(IEnumerable<IntervalConstraint> constraints,
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227 | IReadOnlyDictionary<string, Interval> variableRanges,
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228 | ISymbolicExpressionTree solution, bool useSplitting,
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229 | out double error) {
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230 | var intervalInterpreter = new IntervalInterpreter() {UseIntervalSplitting = useSplitting};
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231 | error = 0.0;
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232 | var satisfied = true;
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233 | foreach (var constraint in constraints) {
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234 | if (constraint.Variable != null && !variableRanges.ContainsKey(constraint.Variable))
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235 | throw new
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236 | ArgumentException($"The given variable {constraint.Variable} in the constraint does not exists in the model.",
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237 | nameof(IntervalConstraintsParser));
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238 |
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239 | satisfied = ConstraintSatisfied(constraint, intervalInterpreter, variableRanges, solution, out double e) && satisfied;
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240 | error += e;
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241 | //if (!satisfied) return false;
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242 | }
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243 |
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244 | return satisfied;
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245 | }
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246 | }
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247 | } |
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