1 | #region License Information
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2 |
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3 | /* HeuristicLab
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4 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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5 | *
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6 | * This file is part of HeuristicLab.
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7 | *
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8 | * HeuristicLab is free software: you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation, either version 3 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * HeuristicLab is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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20 | */
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21 |
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22 | #endregion
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23 |
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24 | using System;
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25 | using System.Collections.Generic;
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26 | using System.ComponentModel;
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27 | using System.Diagnostics;
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28 | using System.Drawing;
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29 | using System.Linq;
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30 | using System.Threading;
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31 | using System.Threading.Tasks;
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32 | using HeuristicLab.Analysis;
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33 | using HeuristicLab.Collections;
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34 | using HeuristicLab.Common;
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35 | using HeuristicLab.Core;
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36 | using HeuristicLab.Data;
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37 | using HeuristicLab.Optimization;
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38 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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39 | using HeuristicLab.Problems.DataAnalysis;
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40 |
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41 | namespace HeuristicLab.DatastreamAnalysis {
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42 | internal enum DatastreamAnalysisOptimizerAction {
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43 | None,
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44 | Prepare,
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45 | Start,
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46 | Stop,
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47 | Pause
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48 | }
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49 |
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50 | [StorableClass]
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51 | [Item("DatastreamAnalysis Optimizer",
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52 | "The main loop for evaluating ensemble models against a incoming datastream of time series fashion.")]
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53 | [Creatable(CreatableAttribute.Categories.Algorithms)]
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54 | public class DatastreamAnalysisOptimizer : Executable, IOptimizer, IStorableContent {
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55 | #region properties
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56 | public string Filename { get; set; }
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57 |
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58 | private DatastreamAnalysisOptimizerAction daoAction;
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59 |
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60 | public IEnumerable<IOptimizer> NestedOptimizers { get; }
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61 |
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62 |
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63 | [Storable]
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64 | protected ILog log;
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65 | public ILog Log {
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66 | get { return log; }
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67 | }
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68 |
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69 | [Storable]
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70 | private ResultCollection results;
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71 |
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72 | public ResultCollection Results {
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73 | get { return results; }
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74 | }
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75 |
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76 | private CancellationTokenSource cancellationTokenSource;
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77 | private bool stopPending;
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78 | private DateTime lastUpdateTime;
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79 | private bool prepared;
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80 | private bool finished;
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81 |
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82 | [Storable]
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83 | protected int runsCounter;
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84 |
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85 | [Storable]
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86 | private RunCollection runs;
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87 |
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88 | public RunCollection Runs
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89 | {
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90 | get { return runs; }
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91 | protected set
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92 | {
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93 | if (value == null) throw new ArgumentNullException();
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94 | if (runs != value) {
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95 | if (runs != null) DeregisterRunsEvents();
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96 | runs = value;
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97 | if (runs != null) RegisterRunsEvents();
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98 | }
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99 | }
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100 | }
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101 |
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102 |
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103 | [Storable]
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104 | private IItemList<RegressionEnsembleModel> ensembles;
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105 |
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106 | public IItemList<RegressionEnsembleModel> Ensembles {
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107 | get { return ensembles; }
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108 | set {
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109 | if (value == null || value == ensembles)
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110 | return;
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111 | if(!(value is IRegressionEnsembleModel)) throw new ArgumentException("Invaid ensemble model type");
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112 | DeregisterEnsembleEvents();
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113 | ensembles = value;
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114 | RegisterEnsembleEvents();
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115 | OnEnsemblesChanged();
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116 | Prepare();
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117 | }
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118 | }
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119 |
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120 |
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121 | // VAR 1: datastream ~= problem data, VAR 2 (TODO): datastream = external source e.g. webservice, AMQP-Queue, etc.
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122 | [Storable]
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123 | private Datastream datastream;
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124 |
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125 | public Datastream Datastream {
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126 | get { return datastream; }
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127 | set {
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128 | if (value == null || value == datastream)
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129 | return;
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130 | if(!(value is IDatastream)) throw new ArgumentException("Invalid datastream type");
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131 | DeregisterDatastreamEvents();
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132 | datastream = value;
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133 | RegisterDatastreamEvents();
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134 | OnDatastreamChanged();
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135 | Prepare();
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136 | }
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137 | }
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138 |
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139 | #endregion properties
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140 |
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141 | #region results properties
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142 | private int ResultsSlidingWindowMovements {
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143 | get { return ((IntValue)Results["Sliding Window Movements"].Value).Value; }
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144 | set { ((IntValue)Results["Sliding Window Movements"].Value).Value = value; }
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145 | }
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146 | private double ResultsBestQuality {
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147 | get { return ((DoubleValue)Results["Best Quality"].Value).Value; }
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148 | set { ((DoubleValue)Results["Best Quality"].Value).Value = value; }
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149 | }
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150 | private DataTable ResultsQualities {
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151 | get { return ((DataTable)Results["Qualities"].Value); }
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152 | }
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153 |
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154 | private const string ResultsQualitiesR2 = "R²";
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155 | private const string ResultsQualitiesPearson = "Pearson";
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156 |
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157 | private DataTable ResultsTargets {
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158 | get { return ((DataTable) Results["Targets"].Value); }
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159 | }
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160 |
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161 | private const string ResultsTargetsReal = "Real";
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162 |
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163 | protected void SetupResults() {
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164 | Results.Clear();
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165 |
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166 | Results.Add(new Result("Sliding Window Movements", new IntValue(0)));
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167 | Results.Add(new Result("Best Quality", new DoubleValue(0)));
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168 | Results.Add(new Result("Qualities", new DataTable("Qualities")));
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169 | Results.Add(new Result("Targets", new DataTable("Targets")));
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170 |
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171 | ResultsQualities.Rows.Add(new DataRow(ResultsQualitiesR2));
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172 | ResultsQualities.Rows.Add(new DataRow(ResultsQualitiesPearson));
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173 | ResultsTargets.Rows.Add(new DataRow(ResultsTargetsReal));
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174 | foreach (var ensemble in Ensembles) {
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175 | ResultsTargets.Rows.Add(new DataRow(ensemble.Name));
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176 | }
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177 | }
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178 |
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179 | #endregion
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180 |
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181 | #region constructors, cloner,...
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182 |
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183 | public DatastreamAnalysisOptimizer() : base() {
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184 | name = "Datastream Analysis";
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185 | log = new Log();
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186 | results = new ResultCollection();
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187 | ensembles = new ItemList<RegressionEnsembleModel>();
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188 | datastream = new Datastream();
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189 | runsCounter = 0;
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190 | runs = new RunCollection();
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191 | Initialize();
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192 | }
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193 |
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194 | [StorableConstructor]
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195 | protected DatastreamAnalysisOptimizer(bool deserializing) : base(deserializing) {
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196 | }
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197 |
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198 | [StorableHook(HookType.AfterDeserialization)]
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199 | private void AfterDeserialization() {
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200 | Initialize();
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201 | }
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202 |
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203 | protected DatastreamAnalysisOptimizer(DatastreamAnalysisOptimizer original, Cloner cloner) : base(original, cloner) {
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204 | name = original.name;
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205 | log = cloner.Clone(original.log);
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206 | results = cloner.Clone(original.results);
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207 | ensembles = (ItemList<RegressionEnsembleModel>) original.Ensembles.Clone(cloner);
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208 | datastream = (Datastream) original.Datastream.Clone(cloner);
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209 | runsCounter = original.runsCounter;
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210 | runs = cloner.Clone(original.runs);
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211 | Initialize();
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212 | }
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213 |
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214 | public override IDeepCloneable Clone(Cloner cloner) {
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215 | return new DatastreamAnalysisOptimizer(this, cloner);
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216 | }
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217 |
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218 | private void Initialize() {
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219 | if (runs != null) RegisterRunsEvents();
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220 | if (datastream != null) RegisterDatastreamEvents();
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221 | if (ensembles != null) RegisterEnsembleEvents();
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222 | }
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223 | #endregion
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224 |
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225 | #region control actions
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226 |
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227 | public override void Prepare() {
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228 | if (ensembles == null || ensembles.Count == 0 || datastream == null || !datastream.SlidingWindowEvaluationPossible) return;
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229 | //if (ensembles.SelectMany(x => x.Models).Count() == 0) return;
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230 | base.Prepare();
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231 | OnPrepared();
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232 | }
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233 |
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234 | public void Prepare(bool clearRuns) {
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235 | if (ensembles == null || ensembles.Count == 0 || datastream == null || !datastream.SlidingWindowEvaluationPossible) return;
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236 |
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237 | base.Prepare();
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238 | if (clearRuns) runs.Clear();
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239 | OnPrepared();
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240 | }
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241 |
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242 | public override void Start() {
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243 | if (ensembles == null || datastream == null) return;
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244 | base.Start();
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245 | cancellationTokenSource = new CancellationTokenSource();
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246 | stopPending = false;
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247 |
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248 | if (prepared) {
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249 | SetupResults();
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250 | //prepared = false;
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251 | }
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252 |
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253 | Task task = Task.Factory.StartNew(Run, cancellationTokenSource.Token, cancellationTokenSource.Token);
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254 | task.ContinueWith(t => {
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255 | try {
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256 | t.Wait();
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257 | }
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258 | catch (AggregateException ex) {
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259 | try {
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260 | ex.Flatten().Handle(x => x is OperationCanceledException);
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261 | } catch (AggregateException remaining) {
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262 | if(remaining.InnerExceptions.Count == 1) OnExceptionOccurred(remaining.InnerExceptions[0]);
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263 | else OnExceptionOccurred(remaining);
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264 | }
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265 | }
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266 | cancellationTokenSource.Dispose();
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267 | cancellationTokenSource = null;
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268 |
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269 | // handle stop/pause
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270 | if (stopPending || finished) {
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271 | OnStopped();
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272 | } else {
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273 | OnPaused();
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274 | }
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275 | //if(!Datastream.SlidingWindowMovementPossible) OnStopped();
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276 | //else OnPaused();
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277 | });
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278 |
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279 | }
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280 |
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281 | public override void Pause() {
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282 | if (ensembles == null || datastream == null) return;
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283 | base.Pause();
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284 | cancellationTokenSource.Cancel();
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285 | }
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286 |
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287 | public override void Stop() {
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288 | if (ensembles == null || datastream == null) return;
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289 | base.Stop();
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290 | if (ExecutionState == ExecutionState.Paused) {
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291 | OnStopped();
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292 | } else {
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293 | stopPending = true;
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294 | cancellationTokenSource.Cancel();
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295 | }
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296 | }
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297 |
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298 | protected override void OnPrepared() {
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299 | ExecutionTime = TimeSpan.Zero;
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300 | foreach (IStatefulItem statefulItem in this.GetObjectGraphObjects(new HashSet<object>() {Runs}).OfType<IStatefulItem>()) {
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301 | statefulItem.InitializeState();
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302 | }
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303 | results.Clear();
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304 | prepared = true;
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305 | finished = false;
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306 | Log.LogMessage("Datastream analysis prepared");
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307 | base.OnPrepared();
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308 | }
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309 |
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310 | protected override void OnStarted() {
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311 | Log.LogMessage("Datastream analysis started");
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312 | base.OnStarted();
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313 | }
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314 |
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315 | protected override void OnPaused() {
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316 | Log.LogMessage("Datastream analysis paused");
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317 | base.OnPaused();
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318 | }
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319 |
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320 | protected override void OnStopped() {
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321 | try {
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322 | runsCounter++;
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323 | var run = new Run();
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324 | run.Filename = Filename;
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325 | run.Name = string.Format("{0} Run {1}", Name, runsCounter);
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326 | CollectParameterValues(run.Parameters);
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327 | CollectResultValues(run.Results);
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328 | runs.Add(run);
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329 | }
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330 | finally {
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331 | Log.LogMessage("Datastream analysis stopped");
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332 | base.OnStopped();
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333 | }
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334 | }
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335 |
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336 | #endregion
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337 |
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338 | #region run
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339 | private void Run(object state) {
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340 | CancellationToken cancellationToken = (CancellationToken) state;
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341 | OnStarted();
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342 | lastUpdateTime = DateTime.UtcNow;
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343 | System.Timers.Timer timer = new System.Timers.Timer(250);
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344 | timer.AutoReset = true;
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345 | timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
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346 | timer.Start();
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347 |
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348 | try {
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349 | Run(cancellationToken);
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350 | }
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351 | finally {
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352 | timer.Elapsed -= new System.Timers.ElapsedEventHandler(timer_Elapsed);
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353 | timer.Stop();
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354 | ExecutionTime += DateTime.UtcNow - lastUpdateTime;
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355 | }
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356 |
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357 | cancellationToken.ThrowIfCancellationRequested();
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358 | }
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359 |
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360 | private int replayedIndex;
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361 |
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362 | protected void Run(CancellationToken cancellationToken) {
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363 | // init algorithm
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364 | var problemData = Datastream.ProblemData;
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365 | var targetVarName = problemData.TargetVariable;
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366 | var activeVariables = problemData.AllowedInputVariables;
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367 |
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368 | if (prepared) {
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369 | // replay datastream until FitnessPartition.End
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370 | //for (int i = 0; i < Datastream.FitnessPartition.End; i++) {
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371 | // var val = problemData.Dataset.GetDoubleValue(targetVarName, i);
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372 | // ResultsTargets.Rows[ResultsTargetsReal].Values.Add(val);
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373 | //}
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374 | //replayedIndex = Datastream.FitnessPartition.End;
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375 | replayedIndex = 0;
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376 | prepared = false;
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377 | }
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378 |
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379 |
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380 | Random rnd = new Random();
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381 |
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382 | try {
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383 | do {
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384 | do {
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385 | cancellationToken.ThrowIfCancellationRequested();
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386 |
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387 | Thread.Sleep(Datastream.SlidingWindowMovementInterval.Value);
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388 | Datastream.MoveSlidingWindow();
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389 |
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390 | if (Datastream.SlidingWindowEvaluationPossible) {
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391 | foreach (var ensemble in Ensembles) {
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392 | // TODO do the window evaluation
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393 | double estimatedVal = problemData.Dataset.GetDoubleValue(targetVarName, replayedIndex)
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394 | * (1.0 + (((double)rnd.Next(0, 30)) / 100));
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395 | for (int i = replayedIndex; i < Datastream.FitnessPartition.End; i++) {
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396 | ResultsTargets.Rows[ensemble.Name].Values.Add(estimatedVal);
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397 | }
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398 | }
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399 | }
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400 |
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401 | // replay datastream until FitnessPartition.End
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402 | for (int i = replayedIndex; i < Datastream.FitnessPartition.End; i++) {
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403 | var val = problemData.Dataset.GetDoubleValue(targetVarName, i);
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404 | ResultsTargets.Rows[ResultsTargetsReal].Values.Add(val);
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405 | }
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406 | replayedIndex = Datastream.FitnessPartition.End;
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407 |
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408 |
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409 | // TODO: collect results and display them
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410 |
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411 | int exp = rnd.Next(100);
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412 | ResultsQualities.Rows[ResultsQualitiesR2].Values.Add(exp);
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413 | ResultsQualities.Rows[ResultsQualitiesPearson].Values.Add((double)exp / 10);
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414 | ResultsSlidingWindowMovements++;
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415 | ResultsBestQuality = (double)exp / 42;
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416 |
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417 | } while (Datastream.SlidingWindowMovementPossible);
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418 | } while (Datastream.UpdateAvailable);
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419 | finished = true;
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420 | }
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421 | catch (Exception ex) {
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422 | if (ex is ArgumentOutOfRangeException) throw ex;
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423 | if (ex is OperationCanceledException) throw ex;
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424 | }
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425 | finally {
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426 | // reset everything
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427 | //Prepare(true);
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428 | }
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429 | }
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430 |
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431 | private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) {
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432 | System.Timers.Timer timer = (System.Timers.Timer)sender;
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433 | timer.Enabled = false;
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434 | DateTime now = DateTime.UtcNow;
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435 | ExecutionTime += now - lastUpdateTime;
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436 | lastUpdateTime = now;
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437 | timer.Enabled = true;
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438 | }
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439 |
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440 | public void CollectParameterValues(IDictionary<string, IItem> values) {
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441 | values.Add("Datastream Analysis Name", new StringValue(Name));
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442 | if (Datastream != null) {
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443 | Datastream.CollectParameterValues(values);
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444 | values.Add("Datastream Name", new StringValue(Datastream.Name));
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445 | }
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446 | }
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447 |
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448 | public void CollectResultValues(IDictionary<string, IItem> values) {
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449 | values.Add("Execution Time", new TimeSpanValue(ExecutionTime));
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450 | Results.CollectResultValues(values);
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451 | }
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452 | #endregion
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453 |
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454 | #region events
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455 |
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456 | #region events registration
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457 |
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458 | public EventHandler EnsemblesChanged;
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459 | public EventHandler DatastreamChanged;
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460 |
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461 | protected virtual void DeregisterRunsEvents() {
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462 | runs.CollectionReset -= new CollectionItemsChangedEventHandler<IRun>(Runs_CollectionReset);
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463 | }
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464 |
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465 | protected virtual void RegisterRunsEvents() {
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466 | runs.CollectionReset += new CollectionItemsChangedEventHandler<IRun>(Runs_CollectionReset);
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467 | }
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468 |
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469 | protected virtual void RegisterDatastreamEvents() {
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470 | datastream.Reset += new EventHandler(Datastream_Reset);
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471 | datastream.ProblemDataChanged += new EventHandler(Datastream_ProblemDataChanged);
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472 | }
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473 |
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474 | protected virtual void DeregisterDatastreamEvents() {
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475 | datastream.Reset -= new EventHandler(Datastream_Reset);
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476 | datastream.ProblemDataChanged -= new EventHandler(Datastream_ProblemDataChanged);
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477 | }
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478 |
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479 | protected virtual void RegisterEnsembleEvents() {
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480 | ensembles.ItemsAdded += new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_ItemsChanged);
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481 | ensembles.ItemsMoved += new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_ItemsChanged);
|
---|
482 | ensembles.ItemsRemoved += new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_ItemsChanged);
|
---|
483 | ensembles.ItemsReplaced += new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_ItemsChanged);
|
---|
484 | ensembles.CollectionReset += new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_Reset);
|
---|
485 | }
|
---|
486 |
|
---|
487 | protected virtual void DeregisterEnsembleEvents() {
|
---|
488 | ensembles.ItemsAdded -= new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_ItemsChanged);
|
---|
489 | ensembles.ItemsMoved -= new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_ItemsChanged);
|
---|
490 | ensembles.ItemsRemoved -= new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_ItemsChanged);
|
---|
491 | ensembles.ItemsReplaced -= new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_ItemsChanged);
|
---|
492 | ensembles.CollectionReset -= new CollectionItemsChangedEventHandler<IndexedItem<RegressionEnsembleModel>>(Ensembles_Reset);
|
---|
493 | }
|
---|
494 | #endregion
|
---|
495 |
|
---|
496 | #region event handling
|
---|
497 |
|
---|
498 | protected virtual void Runs_CollectionReset(object sender, CollectionItemsChangedEventArgs<IRun> e) {
|
---|
499 | runsCounter = runs.Count;
|
---|
500 | }
|
---|
501 |
|
---|
502 | protected virtual void Datastream_Reset(object sender, EventArgs e) {
|
---|
503 | Prepare();
|
---|
504 | }
|
---|
505 |
|
---|
506 | protected virtual void Datastream_ProblemDataChanged(object sender, EventArgs e) {
|
---|
507 | Prepare();
|
---|
508 | }
|
---|
509 |
|
---|
510 | protected virtual void Ensembles_Reset(object sender, EventArgs e) {
|
---|
511 | Prepare();
|
---|
512 | }
|
---|
513 |
|
---|
514 | protected virtual void Ensembles_ItemsChanged(object sender, EventArgs e) {
|
---|
515 | Prepare();
|
---|
516 | }
|
---|
517 |
|
---|
518 | private void OnEnsemblesChanged() {
|
---|
519 | var changed = EnsemblesChanged;
|
---|
520 | if (changed != null)
|
---|
521 | changed(this, EventArgs.Empty);
|
---|
522 | }
|
---|
523 |
|
---|
524 | private void OnDatastreamChanged() {
|
---|
525 | var changed = DatastreamChanged;
|
---|
526 | if (changed != null)
|
---|
527 | changed(this, EventArgs.Empty);
|
---|
528 | }
|
---|
529 |
|
---|
530 | #endregion
|
---|
531 |
|
---|
532 | #endregion
|
---|
533 |
|
---|
534 | #region NamedItem
|
---|
535 |
|
---|
536 | [Storable]
|
---|
537 | protected string name;
|
---|
538 |
|
---|
539 | /// <inheritdoc/>
|
---|
540 | /// <remarks>Calls <see cref="OnNameChanging"/> and also <see cref="OnNameChanged"/>
|
---|
541 | /// eventually in the setter.</remarks>
|
---|
542 | public string Name {
|
---|
543 | get { return name; }
|
---|
544 | set {
|
---|
545 | if (!CanChangeName) throw new NotSupportedException("Name cannot be changed.");
|
---|
546 | if (!(name.Equals(value) || (value == null) && (name == string.Empty))) {
|
---|
547 | CancelEventArgs<string> e = value == null
|
---|
548 | ? new CancelEventArgs<string>(string.Empty)
|
---|
549 | : new CancelEventArgs<string>(value);
|
---|
550 | OnNameChanging(e);
|
---|
551 | if (!e.Cancel) {
|
---|
552 | name = value == null ? string.Empty : value;
|
---|
553 | OnNameChanged();
|
---|
554 | }
|
---|
555 | }
|
---|
556 | }
|
---|
557 | }
|
---|
558 |
|
---|
559 | public virtual bool CanChangeName {
|
---|
560 | get { return true; }
|
---|
561 | }
|
---|
562 |
|
---|
563 | [Storable] protected string description;
|
---|
564 |
|
---|
565 | public string Description {
|
---|
566 | get { return description; }
|
---|
567 | set {
|
---|
568 | if (!CanChangeDescription) throw new NotSupportedException("Description cannot be changed.");
|
---|
569 | if (!(description.Equals(value) || (value == null) && (description == string.Empty))) {
|
---|
570 | description = value == null ? string.Empty : value;
|
---|
571 | OnDescriptionChanged();
|
---|
572 | }
|
---|
573 | }
|
---|
574 | }
|
---|
575 |
|
---|
576 | public virtual bool CanChangeDescription {
|
---|
577 | get { return true; }
|
---|
578 | }
|
---|
579 |
|
---|
580 | /// <summary>
|
---|
581 | /// Gets the string representation of the current instance in the format: <c>Name: [null|Value]</c>.
|
---|
582 | /// </summary>
|
---|
583 | /// <returns>The current instance as a string.</returns>
|
---|
584 | public override string ToString() {
|
---|
585 | return Name;
|
---|
586 | }
|
---|
587 |
|
---|
588 | /// <inheritdoc/>
|
---|
589 | public event EventHandler<CancelEventArgs<string>> NameChanging;
|
---|
590 |
|
---|
591 | /// <summary>
|
---|
592 | /// Fires a new <c>NameChanging</c> event.
|
---|
593 | /// </summary>
|
---|
594 | /// <param name="e">The event arguments of the changing.</param>
|
---|
595 | protected virtual void OnNameChanging(CancelEventArgs<string> e) {
|
---|
596 | var handler = NameChanging;
|
---|
597 | if (handler != null) handler(this, e);
|
---|
598 | }
|
---|
599 |
|
---|
600 | /// <inheritdoc/>
|
---|
601 | public event EventHandler NameChanged;
|
---|
602 |
|
---|
603 | /// <summary>
|
---|
604 | /// Fires a new <c>NameChanged</c> event.
|
---|
605 | /// </summary>
|
---|
606 | /// <remarks>Calls <see cref="ItemBase.OnChanged"/>.</remarks>
|
---|
607 | protected virtual void OnNameChanged() {
|
---|
608 | var handler = NameChanged;
|
---|
609 | if (handler != null) handler(this, EventArgs.Empty);
|
---|
610 | OnToStringChanged();
|
---|
611 | }
|
---|
612 |
|
---|
613 | /// <inheritdoc/>
|
---|
614 | public event EventHandler DescriptionChanged;
|
---|
615 |
|
---|
616 | /// <summary>
|
---|
617 | /// Fires a new <c>DescriptionChanged</c> event.
|
---|
618 | /// </summary>
|
---|
619 | /// <remarks>Calls <see cref="ItemBase.OnChanged"/>.</remarks>
|
---|
620 | protected virtual void OnDescriptionChanged() {
|
---|
621 | var handler = DescriptionChanged;
|
---|
622 | if (handler != null) handler(this, EventArgs.Empty);
|
---|
623 | }
|
---|
624 |
|
---|
625 | #endregion nameditem
|
---|
626 | }
|
---|
627 | } |
---|