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source: trunk/sources/HeuristicLab.Problems.DataAnalysis.Regression/3.3/Symbolic/Evaluators/SymbolicRegressionPearsonsRSquaredEvaluator.cs @ 6996

Last change on this file since 6996 was 5445, checked in by swagner, 14 years ago

Updated year of copyrights (#1406)

File size: 3.9 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using HeuristicLab.Common;
25using HeuristicLab.Core;
26using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28using HeuristicLab.Problems.DataAnalysis.Evaluators;
29using HeuristicLab.Problems.DataAnalysis.Symbolic;
30
31namespace HeuristicLab.Problems.DataAnalysis.Regression.Symbolic {
32  [Item("SymbolicRegressionPearsonsRSquaredEvaluator", "Calculates the pearson r² correlation coefficient of a symbolic regression solution.")]
33  [StorableClass]
34  public class SymbolicRegressionPearsonsRSquaredEvaluator : SingleObjectiveSymbolicRegressionEvaluator {
35
36    public override bool Maximization {
37      get { return true; }
38    }
39   
40    [StorableConstructor]
41    protected SymbolicRegressionPearsonsRSquaredEvaluator(bool deserializing) : base(deserializing) { }
42    protected SymbolicRegressionPearsonsRSquaredEvaluator(SymbolicRegressionPearsonsRSquaredEvaluator original, Cloner cloner)
43      : base(original, cloner) {
44    }
45    public SymbolicRegressionPearsonsRSquaredEvaluator() : base() { }
46
47    public override IDeepCloneable Clone(Cloner cloner) {
48      return new SymbolicRegressionPearsonsRSquaredEvaluator(this, cloner);
49    }
50    public override double Evaluate(ISymbolicExpressionTreeInterpreter interpreter, SymbolicExpressionTree solution, double lowerEstimationLimit, double upperEstimationLimit, Dataset dataset, string targetVariable, IEnumerable<int> rows) {
51      double mse = Calculate(interpreter, solution, lowerEstimationLimit, upperEstimationLimit, dataset, targetVariable, rows);
52      return mse;
53    }
54
55    public static double Calculate(ISymbolicExpressionTreeInterpreter interpreter, SymbolicExpressionTree solution, double lowerEstimationLimit, double upperEstimationLimit, Dataset dataset, string targetVariable, IEnumerable<int> rows) {
56      IEnumerable<double> estimatedValues = interpreter.GetSymbolicExpressionTreeValues(solution, dataset, rows);
57      IEnumerable<double> originalValues = dataset.GetEnumeratedVariableValues(targetVariable, rows);
58      IEnumerator<double> originalEnumerator = originalValues.GetEnumerator();
59      IEnumerator<double> estimatedEnumerator = estimatedValues.GetEnumerator();
60      OnlinePearsonsRSquaredEvaluator r2Evaluator = new OnlinePearsonsRSquaredEvaluator();
61
62      while (originalEnumerator.MoveNext() & estimatedEnumerator.MoveNext()) {
63        double estimated = estimatedEnumerator.Current;
64        double original = originalEnumerator.Current;
65        if (double.IsNaN(estimated))
66          estimated = upperEstimationLimit;
67        else
68          estimated = Math.Min(upperEstimationLimit, Math.Max(lowerEstimationLimit, estimated));
69        r2Evaluator.Add(original, estimated);
70      }
71
72      if (estimatedEnumerator.MoveNext() || originalEnumerator.MoveNext()) {
73        throw new ArgumentException("Number of elements in original and estimated enumeration doesn't match.");
74      } else {
75        return r2Evaluator.RSquared;
76      }
77    }
78  }
79}
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