1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2011 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 HeuristicLab.Common;
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25 | using HeuristicLab.Core;
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26 | using HeuristicLab.Data;
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27 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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29 |
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30 | namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Regression {
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31 | [Item("Pearson R² Evaluator", "Calculates the square of the pearson correlation coefficient (also known as coefficient of determination) of a symbolic regression solution.")]
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32 | [StorableClass]
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33 | public class SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator : SymbolicRegressionSingleObjectiveEvaluator {
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34 | [StorableConstructor]
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35 | protected SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator(bool deserializing) : base(deserializing) { }
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36 | protected SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator(SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator original, Cloner cloner)
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37 | : base(original, cloner) {
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38 | }
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39 | public override IDeepCloneable Clone(Cloner cloner) {
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40 | return new SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator(this, cloner);
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41 | }
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42 |
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43 | public SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator() : base() { }
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44 |
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45 | public override bool Maximization { get { return true; } }
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46 |
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47 | public override IOperation Apply() {
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48 | IEnumerable<int> rows = GenerateRowsToEvaluate();
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49 | double quality = Calculate(SymbolicDataAnalysisTreeInterpreterParameter.ActualValue, SymbolicExpressionTreeParameter.ActualValue, EstimationLimitsParameter.ActualValue.Lower, EstimationLimitsParameter.ActualValue.Upper, ProblemDataParameter.ActualValue, rows);
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50 | Quality = new DoubleValue(quality);
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51 | return base.Apply();
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52 | }
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53 |
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54 | public static double Calculate(ISymbolicDataAnalysisExpressionTreeInterpreter interpreter, ISymbolicExpressionTree solution, double lowerEstimationLimit, double upperEstimationLimit, IRegressionProblemData problemData, IEnumerable<int> rows) {
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55 | IEnumerable<double> estimatedValues = interpreter.GetSymbolicExpressionTreeValues(solution, problemData.Dataset, rows);
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56 | IEnumerable<double> originalValues = problemData.Dataset.GetEnumeratedVariableValues(problemData.TargetVariable, rows);
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57 | try {
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58 | return OnlinePearsonsRSquaredEvaluator.Calculate(estimatedValues, originalValues);
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59 | }
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60 | catch (ArgumentException) {
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61 | // if R² cannot be calculated because of NaN or ininity elements => return worst possible fitness value
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62 | return 0.0;
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63 | }
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64 | }
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65 |
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66 | public override double Evaluate(IExecutionContext context, ISymbolicExpressionTree tree, IRegressionProblemData problemData, IEnumerable<int> rows) {
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67 | SymbolicDataAnalysisTreeInterpreterParameter.ExecutionContext = context;
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68 | EstimationLimitsParameter.ExecutionContext = context;
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69 |
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70 | double r2 = Calculate(SymbolicDataAnalysisTreeInterpreterParameter.ActualValue, tree, EstimationLimitsParameter.ActualValue.Lower, EstimationLimitsParameter.ActualValue.Upper, problemData, rows);
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71 |
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72 | SymbolicDataAnalysisTreeInterpreterParameter.ExecutionContext = null;
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73 | EstimationLimitsParameter.ExecutionContext = null;
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74 |
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75 | return r2;
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76 | }
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77 | }
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78 | }
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