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 HeuristicLab.Core;
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24 | using HeuristicLab.Data;
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25 | using HeuristicLab.GP.Interfaces;
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26 | using HeuristicLab.DataAnalysis;
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27 | using System.Linq;
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28 |
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29 | namespace HeuristicLab.GP.StructureIdentification.TimeSeries {
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30 | public class AvergePercentageChangeEvaluator : GPEvaluatorBase {
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31 | public override string Description {
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32 | get {
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33 | return @"TASK";
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34 | }
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35 | }
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36 |
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37 | public AvergePercentageChangeEvaluator()
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38 | : base() {
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39 | AddVariableInfo(new VariableInfo("Differential", "Wether to transform the target variable to percentage change first or not.", typeof(BoolData), VariableKind.In));
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40 | AddVariableInfo(new VariableInfo("APC", "The average percentage change of the model", typeof(DoubleData), VariableKind.New));
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41 | }
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42 |
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43 | public override void Evaluate(IScope scope, IFunctionTree tree, ITreeEvaluator evaluator, Dataset dataset, int targetVariable, int start, int end) {
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44 | bool differential = GetVariableValue<BoolData>("Differential", scope, true).Data;
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45 | DoubleData apc = GetVariableValue<DoubleData>("APC", scope, false, false);
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46 | if (apc == null) {
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47 | apc = new DoubleData();
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48 | scope.AddVariable(new HeuristicLab.Core.Variable(scope.TranslateName("APC"), apc));
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49 | }
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50 |
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51 | double percentageSum = 0;
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52 | double[] estimatedValues = evaluator.Evaluate(dataset, tree, Enumerable.Range(start, end - start)).ToArray();
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53 | double[] originalValues = dataset.GetVariableValues(targetVariable, start - 1, end);
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54 | for (int i = 0; i < estimatedValues.Length; i++) {
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55 | double prevOriginal;
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56 | double originalPercentageChange;
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57 | double estimatedPercentageChange;
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58 | if (differential) {
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59 | prevOriginal = originalValues[i];
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60 | originalPercentageChange = (originalValues[i + 1] - prevOriginal) / prevOriginal;
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61 | estimatedPercentageChange = (estimatedValues[i] - prevOriginal) / prevOriginal;
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62 |
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63 | } else {
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64 | originalPercentageChange = originalValues[i + 1];
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65 | estimatedPercentageChange = estimatedValues[i];
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66 |
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67 | }
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68 | if (!double.IsNaN(originalPercentageChange) && !double.IsInfinity(originalPercentageChange)) {
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69 | if ((estimatedPercentageChange > 0 && originalPercentageChange > 0) ||
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70 | (estimatedPercentageChange < 0 && originalPercentageChange < 0)) {
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71 | percentageSum += Math.Abs(originalPercentageChange);
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72 | } else if ((estimatedPercentageChange > 0 && originalPercentageChange < 0) ||
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73 | (estimatedPercentageChange < 0 && originalPercentageChange > 0)) {
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74 | percentageSum -= Math.Abs(originalPercentageChange);
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75 | }
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76 | }
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77 | }
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78 |
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79 | percentageSum /= (end - start);
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80 | if (double.IsNaN(percentageSum) || double.IsInfinity(percentageSum)) {
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81 | percentageSum = double.MinValue;
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82 | }
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83 | apc.Data = percentageSum;
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84 | }
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85 | }
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86 | }
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