1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2008 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 System.Collections.Generic;
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24 | using System.Linq;
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25 | using System.Text;
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26 | using HeuristicLab.Core;
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27 | using HeuristicLab.Data;
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28 | using HeuristicLab.Operators;
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29 | using HeuristicLab.Functions;
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30 | using HeuristicLab.DataAnalysis;
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31 |
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32 | namespace HeuristicLab.StructureIdentification {
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33 | public class AccuracyEvaluator : GPEvaluatorBase {
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34 | public override string Description {
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35 | get {
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36 | return @"TASK";
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37 | }
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38 | }
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39 |
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40 | public AccuracyEvaluator()
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41 | : base() {
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42 | AddVariableInfo(new VariableInfo("ClassSeparation", "The value of separation between negative and positive target classification values (for instance 0.5 if negative=0 and positive=1).", typeof(DoubleData), VariableKind.In));
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43 | }
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44 |
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45 | private double[] original = new double[1];
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46 | private double[] estimated = new double[1];
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47 | public override double Evaluate(IScope scope, IFunctionTree functionTree, int targetVariable, Dataset dataset) {
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48 | int trainingStart = GetVariableValue<IntData>("TrainingSamplesStart", scope, true).Data;
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49 | int trainingEnd = GetVariableValue<IntData>("TrainingSamplesEnd", scope, true).Data;
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50 | int nSamples = trainingEnd-trainingStart;
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51 | double limit = GetVariableValue<DoubleData>("ClassSeparation", scope, true).Data;
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52 | double TP = 0;
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53 | double TN = 0;
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54 | double targetMean = dataset.GetMean(targetVariable, trainingStart, trainingEnd);
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55 | for(int sample = trainingStart; sample < trainingEnd; sample++) {
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56 | double est = evaluator.Evaluate(sample);
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57 | double orig = dataset.GetValue(sample, targetVariable);
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58 | if(double.IsNaN(est) || double.IsInfinity(est)) {
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59 | est = targetMean + maximumPunishment;
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60 | } else if(est > targetMean + maximumPunishment) {
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61 | est = targetMean + maximumPunishment;
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62 | } else if(est < targetMean - maximumPunishment) {
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63 | est = targetMean - maximumPunishment;
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64 | }
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65 | if(orig >= limit && est>=limit) TP++;
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66 | if(orig < limit && est < limit) TN++;
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67 | }
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68 | scope.GetVariableValue<DoubleData>("TotalEvaluatedNodes", true).Data = totalEvaluatedNodes + treeSize * nSamples;
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69 | return (TP+TN) / nSamples;
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70 | }
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71 | }
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72 | }
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