1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2012 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.ComponentModel;
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25 | using System.Linq;
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26 | using HeuristicLab.PluginInfrastructure;
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27 |
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28 | namespace HeuristicLab.Problems.DataAnalysis.Views {
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29 | [NonDiscoverableType]
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30 | public class FeatureCorrelationCalculator : Object {
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31 |
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32 | private BackgroundWorker bw;
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33 | private BackgroundWorkerInfo bwInfo;
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34 |
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35 | private IDataAnalysisProblemData problemData;
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36 | public IDataAnalysisProblemData ProblemData {
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37 | set {
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38 | if (bw != null) {
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39 | bw.CancelAsync();
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40 | }
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41 | problemData = value;
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42 | }
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43 | }
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44 |
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45 | public FeatureCorrelationCalculator()
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46 | : base() { }
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47 |
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48 | public FeatureCorrelationCalculator(IDataAnalysisProblemData problemData)
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49 | : base() {
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50 | this.problemData = problemData;
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51 | }
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52 |
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53 | public void CalculateElements(IDependencyCalculator calc, string partition) {
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54 | CalculateElements(problemData.Dataset, calc, partition);
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55 | }
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56 |
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57 | // returns true if any calculation takes place
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58 | public bool CalculateTimeframeElements(IDependencyCalculator calc, string partition, string variable, int frames, double[,] correlation = null) {
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59 | if (correlation == null || correlation.GetLength(1) <= frames) {
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60 | CalculateElements(problemData.Dataset, calc, partition, variable, frames, correlation);
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61 | return true;
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62 | } else {
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63 | return false;
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64 | }
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65 | }
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66 |
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67 | public void TryCancelCalculation() {
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68 | if (bw != null && bw.IsBusy) {
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69 | bwInfo = null;
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70 | bw.CancelAsync();
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71 | }
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72 | }
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73 |
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74 | private double[,] GetElementsOfCorrelation(double[,] corr, int frames) {
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75 | double[,] elements = new double[corr.GetLength(0), frames + 1];
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76 | for (int i = 0; i < corr.GetLength(0); i++) {
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77 | for (int j = 0; j <= frames; j++) {
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78 | elements[i, j] = corr[i, j];
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79 | }
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80 | }
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81 | return elements;
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82 | }
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83 |
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84 | private void CalculateElements(Dataset dataset, IDependencyCalculator calc, string partition, string variable = null, int frames = 0, double[,] alreadyCalculated = null) {
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85 | bwInfo = new BackgroundWorkerInfo { Dataset = dataset, Calculator = calc, Partition = partition, Variable = variable, Frames = frames, AlreadyCalculated = alreadyCalculated };
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86 | if (bw == null) {
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87 | bw = new BackgroundWorker();
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88 | bw.WorkerReportsProgress = true;
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89 | bw.WorkerSupportsCancellation = true;
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90 | bw.DoWork += new DoWorkEventHandler(BwDoWork);
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91 | bw.ProgressChanged += new ProgressChangedEventHandler(BwProgressChanged);
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92 | bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(BwRunWorkerCompleted);
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93 | }
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94 | if (bw.IsBusy) {
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95 | bw.CancelAsync();
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96 | } else {
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97 | bw.RunWorkerAsync(bwInfo);
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98 | }
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99 | }
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100 |
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101 | #region backgroundworker
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102 | private void BwDoWork(object sender, DoWorkEventArgs e) {
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103 | BackgroundWorkerInfo bwInfo = (BackgroundWorkerInfo)e.Argument;
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104 | if (bwInfo.Variable == null) {
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105 | BwCalculateCorrelation(sender, e);
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106 | } else {
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107 | BwCalculateTimeframeCorrelation(sender, e);
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108 | }
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109 | }
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110 |
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111 | private void BwCalculateCorrelation(object sender, DoWorkEventArgs e) {
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112 | BackgroundWorker worker = sender as BackgroundWorker;
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113 |
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114 | BackgroundWorkerInfo bwInfo = (BackgroundWorkerInfo)e.Argument;
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115 | Dataset dataset = bwInfo.Dataset;
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116 | string partition = bwInfo.Partition;
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117 | IDependencyCalculator calc = bwInfo.Calculator;
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118 |
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119 | IList<string> doubleVariableNames = dataset.DoubleVariables.ToList();
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120 | OnlineCalculatorError error = OnlineCalculatorError.None;
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121 | int length = doubleVariableNames.Count;
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122 | double[,] elements = new double[length, length];
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123 | double calculations = (Math.Pow(length, 2) + length) / 2;
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124 |
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125 | worker.ReportProgress(0);
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126 |
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127 | for (int i = 0; i < length; i++) {
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128 | for (int j = 0; j < i + 1; j++) {
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129 | if (worker.CancellationPending) {
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130 | worker.ReportProgress(100);
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131 | e.Cancel = true;
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132 | return;
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133 | }
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134 | IEnumerable<double> var1 = GetRelevantValues(problemData, partition, doubleVariableNames[i]);
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135 | IEnumerable<double> var2 = GetRelevantValues(problemData, partition, doubleVariableNames[j]);
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136 |
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137 | elements[i, j] = calc.Calculate(var1, var2, out error);
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138 |
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139 | if (!error.Equals(OnlineCalculatorError.None)) {
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140 | elements[i, j] = double.NaN;
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141 | }
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142 | elements[j, i] = elements[i, j];
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143 | worker.ReportProgress((int)Math.Round((((Math.Pow(i, 2) + i) / 2 + j + 1.0) / calculations) * 100));
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144 | }
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145 | }
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146 | e.Result = elements;
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147 | worker.ReportProgress(100);
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148 | }
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149 |
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150 | private void BwCalculateTimeframeCorrelation(object sender, DoWorkEventArgs e) {
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151 | BackgroundWorker worker = sender as BackgroundWorker;
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152 |
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153 | BackgroundWorkerInfo bwInfo = (BackgroundWorkerInfo)e.Argument;
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154 | Dataset dataset = bwInfo.Dataset;
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155 | string partition = bwInfo.Partition;
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156 | IDependencyCalculator calc = bwInfo.Calculator;
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157 | string variable = bwInfo.Variable;
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158 | int frames = bwInfo.Frames;
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159 | double[,] alreadyCalculated = bwInfo.AlreadyCalculated;
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160 |
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161 | IList<string> doubleVariableNames = dataset.DoubleVariables.ToList();
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162 | OnlineCalculatorError error = OnlineCalculatorError.None;
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163 | int length = doubleVariableNames.Count;
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164 | double[,] elements = new double[length, frames + 1];
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165 | double calculations = (frames + 1) * length;
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166 |
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167 | worker.ReportProgress(0);
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168 |
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169 | int start = 0;
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170 | if (alreadyCalculated != null) {
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171 | for (int i = 0; i < alreadyCalculated.GetLength(0); i++) {
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172 | Array.Copy(alreadyCalculated, i * alreadyCalculated.GetLength(1), elements, i * elements.GetLength(1), alreadyCalculated.GetLength(1));
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173 | }
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174 | start = alreadyCalculated.GetLength(1);
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175 | }
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176 |
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177 | for (int i = 0; i < length; i++) {
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178 | for (int j = start; j <= frames; j++) {
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179 | if (worker.CancellationPending) {
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180 | worker.ReportProgress(100);
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181 | e.Cancel = true;
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182 | return;
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183 | }
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184 |
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185 | IEnumerable<double> var1 = GetRelevantValues(problemData, partition, variable);
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186 | IEnumerable<double> var2 = GetRelevantValues(problemData, partition, doubleVariableNames[i]);
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187 |
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188 | var valuesInFrame = var1.Take(j);
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189 | var help = var1.Skip(j).ToList();
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190 | help.AddRange(valuesInFrame);
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191 | var1 = help;
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192 |
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193 | elements[i, j] = calc.Calculate(var1, var2, out error);
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194 |
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195 | if (!error.Equals(OnlineCalculatorError.None)) {
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196 | elements[i, j] = double.NaN;
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197 | }
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198 | worker.ReportProgress((int)((100.0 / calculations) * (i * (frames + 1) + j + 1)));
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199 | }
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200 | }
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201 | e.Result = elements;
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202 | worker.ReportProgress(100);
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203 | }
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204 |
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205 | private IEnumerable<double> GetRelevantValues(IDataAnalysisProblemData problemData, string partition, string variable) {
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206 | IEnumerable<double> var = problemData.Dataset.GetDoubleValues(variable);
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207 | if (partition.Equals(FeatureCorrelationPartitions.TRAININGSAMPLES)) {
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208 | var = var.Skip(problemData.TrainingPartition.Start).Take(problemData.TrainingPartition.End - problemData.TrainingPartition.Start);
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209 | } else if (partition.Equals(FeatureCorrelationPartitions.TESTSAMPLES)) {
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210 | var = var.Skip(problemData.TestPartition.Start).Take(problemData.TestPartition.End - problemData.TestPartition.Start);
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211 | }
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212 | return var;
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213 | }
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214 |
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215 | private void BwRunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
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216 | BackgroundWorker worker = sender as BackgroundWorker;
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217 | if (!e.Cancelled && !worker.CancellationPending) {
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218 | if (!(e.Error == null)) {
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219 | ErrorHandling.ShowErrorDialog(e.Error);
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220 | } else {
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221 | OnCorrelationCalculationFinished((double[,])e.Result, bwInfo.Calculator, bwInfo.Partition, bwInfo.Variable);
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222 | }
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223 | } else if (bwInfo != null) {
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224 | bw.RunWorkerAsync(bwInfo);
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225 | }
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226 | }
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227 | #endregion
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228 |
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229 | #region events
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230 | public class CorrelationCalculationFinishedArgs : EventArgs {
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231 | public double[,] Correlation { get; private set; }
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232 | public IDependencyCalculator Calculcator { get; private set; }
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233 | public string Partition { get; private set; }
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234 | public string Variable { get; private set; }
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235 |
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236 | public CorrelationCalculationFinishedArgs(double[,] correlation, IDependencyCalculator calculator, string partition, string variable = null) {
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237 | this.Correlation = correlation;
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238 | this.Calculcator = calculator;
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239 | this.Partition = partition;
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240 | this.Variable = variable;
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241 | }
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242 | }
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243 |
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244 | public delegate void CorrelationCalculationFinishedHandler(object sender, CorrelationCalculationFinishedArgs e);
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245 | public event CorrelationCalculationFinishedHandler CorrelationCalculationFinished;
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246 | protected virtual void OnCorrelationCalculationFinished(double[,] correlation, IDependencyCalculator calculator, string partition, string variable = null) {
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247 | var handler = CorrelationCalculationFinished;
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248 | if (handler != null)
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249 | handler(this, new CorrelationCalculationFinishedArgs(correlation, calculator, partition, variable));
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250 | }
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251 |
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252 | public delegate void ProgressCalculationHandler(object sender, ProgressChangedEventArgs e);
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253 | public event ProgressCalculationHandler ProgressCalculation;
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254 | protected void BwProgressChanged(object sender, ProgressChangedEventArgs e) {
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255 | BackgroundWorker worker = sender as BackgroundWorker;
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256 | if (ProgressCalculation != null) {
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257 | ProgressCalculation(sender, e);
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258 | }
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259 | }
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260 | #endregion
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261 |
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262 | private class BackgroundWorkerInfo {
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263 | public Dataset Dataset { get; set; }
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264 | public IDependencyCalculator Calculator { get; set; }
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265 | public string Partition { get; set; }
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266 | public string Variable { get; set; }
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267 | public int Frames { get; set; }
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268 | public double[,] AlreadyCalculated { get; set; }
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269 | }
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270 | }
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271 | }
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