[6913] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[11170] | 3 | * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[6913] | 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 System.Linq;
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| 25 | using HeuristicLab.Common;
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| 26 |
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| 27 | namespace HeuristicLab.Problems.DataAnalysis {
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| 28 | public class NormalizedGiniCalculator {
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| 29 |
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[6964] | 30 | public static double Calculate(IEnumerable<double> originalValues, IEnumerable<double> estimatedValues, out OnlineCalculatorError errorState) {
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| 31 | var originalValuesArr = originalValues.ToArray();
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| 32 | var estimatedValuesArr = estimatedValues.ToArray();
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| 33 | if (originalValuesArr.Count() != estimatedValuesArr.Count()) {
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| 34 | throw new ArgumentException("Number of elements in originalValues and estimatedValues enumerations doesn't match.");
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[6913] | 35 | }
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[6964] | 36 | double oe = Gini(originalValuesArr, estimatedValuesArr, out errorState);
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[6913] | 37 | if (errorState != OnlineCalculatorError.None) return double.NaN;
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| 38 |
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[7023] | 39 | return oe / (Gini(originalValuesArr, originalValuesArr, out errorState));
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[6913] | 40 | }
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| 41 |
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| 42 | private static double Gini(IEnumerable<double> original, IEnumerable<double> estimated, out OnlineCalculatorError errorState) {
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| 43 | var pairs =
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| 44 | estimated.Zip(original, (e, o) => new { e, o })
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| 45 | .OrderByDescending(p => p.e);
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| 46 | if (pairs.Any()) errorState = OnlineCalculatorError.None;
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| 47 | else errorState = OnlineCalculatorError.InsufficientElementsAdded;
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| 48 | double giniSum = 0.0;
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| 49 | double sumOriginal = 0.0;
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| 50 | int n = 0;
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| 51 | foreach (var p in pairs) {
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| 52 | if (double.IsNaN(p.o) || double.IsNaN(p.e)) {
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| 53 | errorState = OnlineCalculatorError.InvalidValueAdded;
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| 54 | return double.NaN;
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| 55 | }
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| 56 | sumOriginal += p.o;
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| 57 | giniSum += sumOriginal;
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| 58 | n++;
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| 59 | }
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| 60 | giniSum /= sumOriginal;
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| 61 |
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| 62 | return (giniSum - ((n + 1) / 2.0)) / n;
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| 63 | }
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| 64 | }
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| 65 | }
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