source: stable/HeuristicLab.Problems.DataAnalysis/3.4/OnlineCalculators/ConfusionMatrixCalculator.cs @ 13156

Last change on this file since 13156 was 13156, checked in by gkronber, 5 years ago

#1998: merged changes from trunk to stable branch

File size: 2.7 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 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 System.Linq;
25
26namespace HeuristicLab.Problems.DataAnalysis {
27  public class ConfusionMatrixCalculator {
28    public static double[,] Calculate(IEnumerable<double> originalValues, IEnumerable<double> estimatedValues, out OnlineCalculatorError errorState) {
29
30      Dictionary<double, int> classValueIndexMapping = new Dictionary<double, int>();
31      int index = 0;
32      foreach (double classValue in originalValues.OrderBy(x => x)) {
33        if (!classValueIndexMapping.ContainsKey(classValue)) {
34          classValueIndexMapping.Add(classValue, index);
35          index++;
36        }
37      }
38
39      int classes = classValueIndexMapping.Count;
40      double[,] confusionMatrix = new double[classes, classes];
41
42
43      IEnumerator<double> originalEnumerator = originalValues.GetEnumerator();
44      IEnumerator<double> estimatedEnumerator = estimatedValues.GetEnumerator();
45      int originalIndex;
46      int estimatedIndex;
47      while (originalEnumerator.MoveNext() & estimatedEnumerator.MoveNext()) {
48        if (!classValueIndexMapping.TryGetValue(originalEnumerator.Current, out originalIndex)) {
49          errorState = OnlineCalculatorError.InvalidValueAdded;
50          return null;
51        }
52        if (!classValueIndexMapping.TryGetValue(estimatedEnumerator.Current, out estimatedIndex)) {
53          errorState = OnlineCalculatorError.InvalidValueAdded;
54          return null;
55        }
56
57        confusionMatrix[estimatedIndex, originalIndex] += 1;
58      }
59
60      if (originalEnumerator.MoveNext() || estimatedEnumerator.MoveNext()) {
61        throw new ArgumentException("Number of elements in originalValues and estimatedValues enumerations doesn't match.");
62
63      }
64
65      errorState = OnlineCalculatorError.None;
66      return confusionMatrix;
67    }
68  }
69}
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