[5500] | 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.Collections.Generic;
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| 23 | using HeuristicLab.Common;
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| 24 | using HeuristicLab.Core;
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| 25 | using HeuristicLab.Data;
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| 26 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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| 27 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 28 |
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[5501] | 29 | namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Regression {
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[5618] | 30 | [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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[5500] | 31 | [StorableClass]
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| 32 | public class SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator : SymbolicRegressionSingleObjectiveEvaluator {
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| 33 | [StorableConstructor]
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| 34 | protected SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator(bool deserializing) : base(deserializing) { }
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| 35 | protected SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator(SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator original, Cloner cloner)
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| 36 | : base(original, cloner) {
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| 37 | }
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| 38 | public override IDeepCloneable Clone(Cloner cloner) {
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| 39 | return new SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator(this, cloner);
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| 40 | }
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| 41 |
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[5505] | 42 | public SymbolicRegressionSingleObjectivePearsonRSquaredEvaluator() : base() { }
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| 43 |
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[5514] | 44 | public override bool Maximization { get { return true; } }
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| 45 |
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[5500] | 46 | public override IOperation Apply() {
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[5851] | 47 | var solution = SymbolicExpressionTreeParameter.ActualValue;
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[5500] | 48 | IEnumerable<int> rows = GenerateRowsToEvaluate();
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[5851] | 49 |
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| 50 | double quality = Calculate(SymbolicDataAnalysisTreeInterpreterParameter.ActualValue, solution, EstimationLimitsParameter.ActualValue.Lower, EstimationLimitsParameter.ActualValue.Upper, ProblemDataParameter.ActualValue, rows);
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| 51 | QualityParameter.ActualValue = new DoubleValue(quality);
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| 52 |
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[5500] | 53 | return base.Apply();
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| 54 | }
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| 55 |
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[5624] | 56 | public static double Calculate(ISymbolicDataAnalysisExpressionTreeInterpreter interpreter, ISymbolicExpressionTree solution, double lowerEstimationLimit, double upperEstimationLimit, IRegressionProblemData problemData, IEnumerable<int> rows) {
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[5500] | 57 | IEnumerable<double> estimatedValues = interpreter.GetSymbolicExpressionTreeValues(solution, problemData.Dataset, rows);
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[6784] | 58 | IEnumerable<double> originalValues = problemData.Dataset.GetDoubleValues(problemData.TargetVariable, rows);
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[5942] | 59 | OnlineCalculatorError errorState;
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| 60 | double r2 = OnlinePearsonsRSquaredCalculator.Calculate(estimatedValues, originalValues, out errorState);
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| 61 | if (errorState != OnlineCalculatorError.None) return 0.0;
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[5894] | 62 | else return r2;
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[5500] | 63 | }
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[5613] | 64 |
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| 65 | public override double Evaluate(IExecutionContext context, ISymbolicExpressionTree tree, IRegressionProblemData problemData, IEnumerable<int> rows) {
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[5722] | 66 | SymbolicDataAnalysisTreeInterpreterParameter.ExecutionContext = context;
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[5770] | 67 | EstimationLimitsParameter.ExecutionContext = context;
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[5722] | 68 |
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[5770] | 69 | double r2 = Calculate(SymbolicDataAnalysisTreeInterpreterParameter.ActualValue, tree, EstimationLimitsParameter.ActualValue.Lower, EstimationLimitsParameter.ActualValue.Upper, problemData, rows);
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[5722] | 70 |
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| 71 | SymbolicDataAnalysisTreeInterpreterParameter.ExecutionContext = null;
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[5770] | 72 | EstimationLimitsParameter.ExecutionContext = null;
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[5722] | 73 |
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| 74 | return r2;
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[5613] | 75 | }
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[5500] | 76 | }
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| 77 | }
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