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 HeuristicLab.Common;
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24 |
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25 | namespace HeuristicLab.Problems.DataAnalysis.Evaluators {
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26 | public class OnlineMeanAbsolutePercentageErrorEvaluator : IOnlineEvaluator {
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27 |
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28 | private double sre;
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29 | private int n;
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30 | public double MeanAbsolutePercentageError {
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31 | get {
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32 | if (n < 1)
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33 | throw new InvalidOperationException("No elements");
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34 | else
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35 | return sre / n;
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36 | }
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37 | }
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38 |
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39 | public OnlineMeanAbsolutePercentageErrorEvaluator() {
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40 | Reset();
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41 | }
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42 |
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43 | #region IOnlineEvaluator Members
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44 | public double Value {
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45 | get { return MeanAbsolutePercentageError; }
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46 | }
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47 | public void Reset() {
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48 | n = 0;
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49 | sre = 0.0;
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50 | }
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51 |
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52 | public void Add(double original, double estimated) {
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53 | if (double.IsNaN(estimated) || double.IsInfinity(estimated) ||
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54 | double.IsNaN(original) || double.IsInfinity(original)) {
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55 | throw new ArgumentException("Relative error is not defined for variables with NaN or infinity values.");
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56 | } else {
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57 | if (!original.IsAlmost(0.0)) {
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58 | sre += Math.Abs((estimated - original) / original);
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59 | n++;
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60 | }
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61 | }
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62 | }
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63 |
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64 | #endregion
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65 | }
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66 | }
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