1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | |
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15 | package de.ugoe.cs.autoquest.tasktrees.temporalrelation; |
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16 | |
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17 | import java.util.HashMap; |
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18 | import java.util.HashSet; |
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19 | import java.util.Iterator; |
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20 | import java.util.LinkedList; |
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21 | import java.util.List; |
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22 | import java.util.Map; |
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23 | import java.util.Set; |
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24 | import java.util.logging.Level; |
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25 | |
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26 | import de.ugoe.cs.autoquest.tasktrees.taskequality.TaskEquality; |
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27 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IIteration; |
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28 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IIterationInstance; |
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29 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISelection; |
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30 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISelectionInstance; |
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31 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequence; |
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32 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequenceInstance; |
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33 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask; |
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34 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskBuilder; |
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35 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskFactory; |
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36 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
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37 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstanceList; |
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38 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IUserSession; |
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39 | import de.ugoe.cs.autoquest.usageprofiles.SymbolMap; |
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40 | import de.ugoe.cs.autoquest.usageprofiles.Trie; |
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41 | import de.ugoe.cs.autoquest.usageprofiles.TrieProcessor; |
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42 | import de.ugoe.cs.util.StopWatch; |
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43 | import de.ugoe.cs.util.console.Console; |
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44 | |
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45 | /** |
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46 | * <p> |
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47 | * This class implements the major rule for creating task trees based on a set of recorded |
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48 | * user sessions. For this, it first harmonizes all tasks. This eases later comparison. Then it |
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49 | * searches the sessions for iterations and replaces them accordingly. Then it searches for sub |
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50 | * sequences being the longest and occurring most often. For each found sub sequence, it replaces |
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51 | * the occurrences by creating appropriate {@link ISequence}s. Afterwards, again searches for |
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52 | * iterations and then again for sub sequences until no more replacements are done. |
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53 | * </p> |
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54 | * <p> |
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55 | * For determining the longest sequence occurring most often, the implementation uses a |
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56 | * {@link Trie}. The depth of the tree is initially 3. If the algorithm has a longest sequence |
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57 | * occurring most often whose length is equal to the depth of the trie, it recalculates the trie |
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58 | * with an increased depth. |
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59 | * </p> |
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60 | * |
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61 | * @author Patrick Harms |
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62 | */ |
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63 | class SequenceForTaskDetectionRule implements ISessionScopeRule { |
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64 | |
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65 | /** |
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66 | * <p> |
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67 | * the task factory to be used for creating substructures for the temporal |
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68 | * relationships identified during rul application |
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69 | * </p> |
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70 | */ |
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71 | private ITaskFactory taskFactory; |
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72 | /** |
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73 | * <p> |
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74 | * the task builder to be used for creating substructures for the temporal relationships |
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75 | * identified during rule application |
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76 | * </p> |
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77 | */ |
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78 | private ITaskBuilder taskBuilder; |
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79 | |
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80 | /** |
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81 | * <p> |
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82 | * the task handling strategy to be used for comparing tasks for preparation, i.e., before |
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83 | * the tasks are harmonized |
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84 | * </p> |
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85 | */ |
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86 | private TaskHandlingStrategy preparationTaskHandlingStrategy; |
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87 | |
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88 | /** |
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89 | * <p> |
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90 | * the task handling strategy to be used for comparing tasks during iteration detection an trie |
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91 | * generation, i.e., after the tasks are harmonized |
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92 | * </p> |
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93 | */ |
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94 | private TaskHandlingStrategy identityTaskHandlingStrategy;; |
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95 | |
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96 | /** |
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97 | * <p> |
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98 | * instantiates the rule and initializes it with a task equality to be considered when |
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99 | * comparing tasks as well as a task factory and builder to be used for creating task |
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100 | * structures. |
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101 | * </p> |
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102 | * |
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103 | * @param minimalTaskEquality the task equality to be considered when comparing tasks |
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104 | * @param taskFactory the task factory to be used for creating substructures |
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105 | * @param taskBuilder the task builder to be used for creating substructures |
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106 | */ |
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107 | SequenceForTaskDetectionRule(TaskEquality minimalTaskEquality, |
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108 | ITaskFactory taskFactory, |
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109 | ITaskBuilder taskBuilder) |
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110 | { |
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111 | this.taskFactory = taskFactory; |
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112 | this.taskBuilder = taskBuilder; |
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113 | |
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114 | this.preparationTaskHandlingStrategy = new TaskHandlingStrategy(minimalTaskEquality); |
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115 | this.identityTaskHandlingStrategy = new TaskHandlingStrategy(TaskEquality.IDENTICAL); |
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116 | } |
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117 | |
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118 | /* (non-Javadoc) |
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119 | * @see java.lang.Object#toString() |
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120 | */ |
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121 | @Override |
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122 | public String toString() { |
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123 | return "SequenceForTaskDetectionRule"; |
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124 | } |
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125 | |
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126 | /* (non-Javadoc) |
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127 | * @see de.ugoe.cs.autoquest.tasktrees.temporalrelation.ISessionScopeRule#apply(java.util.List) |
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128 | */ |
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129 | @Override |
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130 | public RuleApplicationResult apply(List<IUserSession> sessions) { |
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131 | RuleApplicationData appData = new RuleApplicationData(sessions); |
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132 | |
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133 | // this is the real rule application. Loop while something is replaced. |
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134 | harmonizeEventTaskInstancesModel(appData); |
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135 | do { |
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136 | System.out.println(); |
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137 | |
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138 | appData.getStopWatch().start("whole loop"); |
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139 | detectAndReplaceIterations(appData); |
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140 | |
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141 | appData.getStopWatch().start("task replacement"); |
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142 | detectAndReplaceTasks(appData); |
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143 | appData.getStopWatch().stop("task replacement"); |
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144 | appData.getStopWatch().stop("whole loop"); |
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145 | |
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146 | //((TaskTreeNodeComparator) taskComparator).getStopWatch().dumpStatistics(System.out); |
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147 | //((TaskTreeNodeComparator) taskComparator).getStopWatch().reset(); |
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148 | |
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149 | appData.getStopWatch().dumpStatistics(System.out); |
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150 | appData.getStopWatch().reset(); |
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151 | |
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152 | } |
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153 | while (appData.detectedAndReplacedTasks()); |
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154 | |
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155 | Console.println |
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156 | ("created " + appData.getResult().getNewlyCreatedTasks().size() + |
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157 | " new tasks and " + appData.getResult().getNewlyCreatedTaskInstances().size() + |
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158 | " appropriate instances\n"); |
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159 | |
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160 | if ((appData.getResult().getNewlyCreatedTasks().size() > 0) || |
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161 | (appData.getResult().getNewlyCreatedTaskInstances().size() > 0)) |
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162 | { |
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163 | appData.getResult().setRuleApplicationStatus(RuleApplicationStatus.FINISHED); |
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164 | } |
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165 | |
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166 | return appData.getResult(); |
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167 | } |
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168 | |
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169 | /** |
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170 | * <p> |
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171 | * harmonizes the event task instances by unifying tasks. This is done, as initially the |
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172 | * event tasks being equal with respect to the considered task equality are distinct objects. |
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173 | * The comparison of these distinct objects is more time consuming than comparing the object |
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174 | * references. |
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175 | * </p> |
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176 | * |
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177 | * @param appData the rule application data combining all data used for applying this rule |
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178 | */ |
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179 | private void harmonizeEventTaskInstancesModel(RuleApplicationData appData) { |
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180 | Console.traceln(Level.INFO, "harmonizing task model of event task instances"); |
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181 | appData.getStopWatch().start("harmonizing event tasks"); |
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182 | |
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183 | SymbolMap<ITaskInstance, ITask> uniqueTasks = |
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184 | preparationTaskHandlingStrategy.createSymbolMap(); |
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185 | TaskInstanceComparator comparator = preparationTaskHandlingStrategy.getTaskComparator(); |
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186 | |
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187 | int unifiedTasks = 0; |
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188 | ITask task; |
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189 | List<IUserSession> sessions = appData.getSessions(); |
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190 | int sessionNo = 0; |
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191 | for (IUserSession session : sessions) { |
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192 | Console.traceln(Level.FINE, "handling " + (++sessionNo) + ". " + session); |
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193 | for (ITaskInstance taskInstance : session) { |
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194 | task = uniqueTasks.getValue(taskInstance); |
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195 | |
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196 | if (task == null) { |
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197 | uniqueTasks.addSymbol(taskInstance, taskInstance.getTask()); |
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198 | } |
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199 | else { |
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200 | taskBuilder.setTask(taskInstance, task); |
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201 | unifiedTasks++; |
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202 | } |
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203 | } |
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204 | |
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205 | comparator.clearBuffers(); |
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206 | } |
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207 | |
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208 | appData.getStopWatch().stop("harmonizing event tasks"); |
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209 | Console.traceln(Level.INFO, "harmonized " + unifiedTasks + " task occurrences (still " + |
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210 | uniqueTasks.size() + " different tasks)"); |
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211 | |
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212 | appData.getStopWatch().dumpStatistics(System.out); |
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213 | appData.getStopWatch().reset(); |
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214 | } |
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215 | |
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216 | /** |
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217 | * <p> |
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218 | * searches for direct iterations of single tasks in all sequences and replaces them with |
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219 | * {@link IIteration}s, respectively appropriate instances. Also all single occurrences of |
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220 | * a task that is iterated somewhen are replaced with iterations to have again an efficient |
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221 | * way for task comparisons. |
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222 | * </p> |
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223 | * |
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224 | * @param appData the rule application data combining all data used for applying this rule |
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225 | */ |
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226 | private void detectAndReplaceIterations(RuleApplicationData appData) { |
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227 | Console.traceln(Level.FINE, "detecting iterations"); |
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228 | appData.getStopWatch().start("detecting iterations"); |
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229 | |
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230 | List<IUserSession> sessions = appData.getSessions(); |
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231 | |
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232 | Set<ITask> iteratedTasks = searchIteratedTasks(sessions); |
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233 | |
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234 | if (iteratedTasks.size() > 0) { |
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235 | replaceIterationsOf(iteratedTasks, sessions, appData); |
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236 | } |
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237 | |
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238 | appData.getStopWatch().stop("detecting iterations"); |
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239 | Console.traceln(Level.INFO, "replaced " + iteratedTasks.size() + " iterated tasks"); |
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240 | } |
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241 | |
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242 | /** |
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243 | * <p> |
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244 | * searches the provided sessions for task iterations. If a task is iterated, it is added |
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245 | * to the returned set. |
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246 | * </p> |
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247 | * |
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248 | * @param the session to search for iterations in |
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249 | * |
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250 | * @return a set of tasks being iterated somewhere |
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251 | */ |
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252 | private Set<ITask> searchIteratedTasks(List<IUserSession> sessions) { |
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253 | Set<ITask> iteratedTasks = new HashSet<ITask>(); |
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254 | for (IUserSession session : sessions) { |
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255 | for (int i = 0; i < (session.size() - 1); i++) { |
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256 | // we prepared the task instances to refer to unique tasks, if they are treated |
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257 | // as equal. Therefore, we just compare the identity of the tasks of the task |
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258 | // instances |
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259 | if (session.get(i).getTask() == session.get(i + 1).getTask()) { |
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260 | iteratedTasks.add(session.get(i).getTask()); |
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261 | } |
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262 | } |
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263 | } |
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264 | |
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265 | return iteratedTasks; |
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266 | } |
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267 | |
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268 | /** |
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269 | * <p> |
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270 | * replaces all occurrences of all tasks provided in the set with iterations |
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271 | * </p> |
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272 | * |
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273 | * @param iteratedTasks the tasks to be replaced with iterations |
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274 | * @param sessions the sessions in which the tasks are to be replaced |
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275 | * @param appData the rule application data combining all data used for applying this rule |
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276 | */ |
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277 | private void replaceIterationsOf(Set<ITask> iteratedTasks, |
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278 | List<IUserSession> sessions, |
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279 | RuleApplicationData appData) |
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280 | { |
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281 | Map<ITask, IIteration> iterations = new HashMap<ITask, IIteration>(); |
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282 | Map<IIteration, List<IIterationInstance>> iterationInstances = |
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283 | new HashMap<IIteration, List<IIterationInstance>>(); |
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284 | |
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285 | for (ITask iteratedTask : iteratedTasks) { |
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286 | IIteration iteration = taskFactory.createNewIteration(); |
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287 | iterations.put(iteratedTask, iteration); |
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288 | iterationInstances.put(iteration, new LinkedList<IIterationInstance>()); |
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289 | } |
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290 | |
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291 | IIterationInstance iterationInstance; |
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292 | |
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293 | for (IUserSession session : sessions) { |
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294 | int index = 0; |
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295 | iterationInstance = null; |
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296 | |
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297 | while (index < session.size()) { |
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298 | // we prepared the task instances to refer to unique tasks, if they are treated |
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299 | // as equal. Therefore, we just compare the identity of the tasks of the task |
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300 | // instances |
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301 | ITask currentTask = session.get(index).getTask(); |
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302 | IIteration iteration = iterations.get(currentTask); |
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303 | if (iteration != null) { |
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304 | if ((iterationInstance == null) || (iterationInstance.getTask() != iteration)) |
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305 | { |
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306 | iterationInstance = taskFactory.createNewTaskInstance(iteration); |
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307 | iterationInstances.get(iteration).add(iterationInstance); |
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308 | taskBuilder.addTaskInstance(session, index, iterationInstance); |
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309 | index++; |
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310 | } |
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311 | |
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312 | taskBuilder.addChild(iterationInstance, session.get(index)); |
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313 | taskBuilder.removeTaskInstance(session, index); |
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314 | } |
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315 | else { |
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316 | if (iterationInstance != null) { |
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317 | iterationInstance = null; |
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318 | } |
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319 | index++; |
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320 | } |
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321 | } |
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322 | } |
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323 | |
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324 | for (Map.Entry<IIteration, List<IIterationInstance>> entry : iterationInstances.entrySet()) |
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325 | { |
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326 | harmonizeIterationInstancesModel(entry.getKey(), entry.getValue()); |
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327 | } |
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328 | } |
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329 | |
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330 | /** |
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331 | * <p> |
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332 | * TODO clarify why this is done |
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333 | * </p> |
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334 | */ |
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335 | private void harmonizeIterationInstancesModel(IIteration iteration, |
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336 | List<IIterationInstance> iterationInstances) |
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337 | { |
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338 | List<ITask> iteratedTaskVariants = new LinkedList<ITask>(); |
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339 | TaskInstanceComparator comparator = preparationTaskHandlingStrategy.getTaskComparator(); |
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340 | |
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341 | // merge the lexically different variants of iterated task to a unique list |
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342 | for (IIterationInstance iterationInstance : iterationInstances) { |
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343 | for (ITaskInstance executionVariant : iterationInstance) { |
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344 | ITask candidate = executionVariant.getTask(); |
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345 | |
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346 | boolean found = false; |
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347 | for (ITask taskVariant : iteratedTaskVariants) { |
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348 | if (comparator.areLexicallyEqual(taskVariant, candidate)) { |
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349 | taskBuilder.setTask(executionVariant, taskVariant); |
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350 | found = true; |
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351 | break; |
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352 | } |
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353 | } |
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354 | |
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355 | if (!found) { |
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356 | iteratedTaskVariants.add(candidate); |
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357 | } |
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358 | } |
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359 | } |
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360 | |
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361 | // if there are more than one lexically different variant of iterated tasks, adapt the |
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362 | // iteration model to be a selection of different variants. In this case also adapt |
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363 | // the generated iteration instances to correctly contain selection instances. If there |
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364 | // is only one variant of an iterated task, simply set this as the marked task of the |
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365 | // iteration. In this case, the instances can be preserved as is |
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366 | if (iteratedTaskVariants.size() > 1) { |
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367 | ISelection selection = taskFactory.createNewSelection(); |
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368 | |
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369 | for (ITask variant : iteratedTaskVariants) { |
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370 | taskBuilder.addChild(selection, variant); |
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371 | } |
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372 | |
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373 | taskBuilder.setMarkedTask(iteration, selection); |
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374 | |
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375 | for (IIterationInstance instance : iterationInstances) { |
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376 | for (int i = 0; i < instance.size(); i++) { |
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377 | ISelectionInstance selectionInstance = |
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378 | taskFactory.createNewTaskInstance(selection); |
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379 | taskBuilder.setChild(selectionInstance, instance.get(i)); |
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380 | taskBuilder.setTaskInstance(instance, i, selectionInstance); |
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381 | } |
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382 | } |
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383 | } |
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384 | else { |
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385 | taskBuilder.setMarkedTask(iteration, iteratedTaskVariants.get(0)); |
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386 | } |
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387 | } |
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388 | |
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389 | /** |
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390 | * TODO go on commenting |
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391 | * @param appData the rule application data combining all data used for applying this rule |
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392 | */ |
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393 | private void detectAndReplaceTasks(RuleApplicationData appData) { |
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394 | Console.traceln(Level.FINE, "detecting and replacing tasks"); |
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395 | appData.getStopWatch().start("detecting tasks"); |
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396 | |
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397 | getSequencesOccuringMostOften(appData); |
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398 | |
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399 | appData.getStopWatch().stop("detecting tasks"); |
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400 | appData.getStopWatch().start("replacing tasks"); |
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401 | |
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402 | replaceSequencesOccurringMostOften(appData); |
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403 | |
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404 | appData.getStopWatch().stop("replacing tasks"); |
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405 | Console.traceln(Level.INFO, "detected and replaced " + appData.getLastFoundTasks().size() + |
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406 | " tasks occuring " + appData.getLastFoundTasks().getOccurrenceCount() + |
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407 | " times"); |
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408 | } |
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409 | |
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410 | /** |
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411 | * @param appData the rule application data combining all data used for applying this rule |
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412 | */ |
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413 | private void getSequencesOccuringMostOften(RuleApplicationData appData) { |
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414 | Console.traceln(Level.FINE, "determining most prominent tasks"); |
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415 | |
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416 | Tasks tasks; |
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417 | boolean createNewTrie = (appData.getLastTrie() == null) || |
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418 | appData.detectedAndReplacedTasks(); // tree has changed |
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419 | |
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420 | do { |
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421 | if (createNewTrie) { |
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422 | createNewTrie(appData); |
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423 | } |
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424 | |
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425 | MaxCountAndLongestTasksFinder finder = new MaxCountAndLongestTasksFinder(); |
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426 | appData.getLastTrie().process(finder); |
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427 | |
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428 | tasks = finder.getFoundTasks(); |
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429 | |
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430 | createNewTrie = false; |
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431 | |
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432 | for (List<ITaskInstance> task : tasks) { |
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433 | if (task.size() >= appData.getTrainedSequenceLength()) { |
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434 | // Trie must be recreated with a longer sequence length to be sure that |
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435 | // the found sequences occurring most often are found in their whole length |
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436 | appData.setTrainedSequenceLength(appData.getTrainedSequenceLength() + 1); |
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437 | createNewTrie = true; |
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438 | break; |
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439 | } |
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440 | } |
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441 | } |
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442 | while (createNewTrie); |
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443 | |
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444 | // create a normal trie for comparison |
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445 | /*System.out.println("creating test trie for comparison"); |
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446 | |
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447 | appData.getStopWatch().start("testtrie"); |
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448 | Trie<ITaskInstance> trie = new Trie<ITaskInstance>(identityTaskComparator); |
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449 | |
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450 | for (IUserSession session : appData.getSessions()) { |
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451 | trie.train(session.getExecutedTasks(), appData.getTrainedSequenceLength()); |
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452 | } |
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453 | |
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454 | appData.getStopWatch().stop("testtrie"); |
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455 | |
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456 | MaxCountAndLongestTasksFinder finder = new MaxCountAndLongestTasksFinder(); |
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457 | trie.process(finder); |
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458 | |
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459 | boolean allTasksEqual = finder.getFoundTasks().size() == tasks.size(); |
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460 | |
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461 | allTasksEqual &= finder.getFoundTasks().occurrenceCount == tasks.occurrenceCount; |
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462 | |
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463 | for (List<ITaskInstance> task1 : finder.getFoundTasks()) { |
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464 | boolean foundTask = false; |
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465 | for (List<ITaskInstance> task2 : tasks) { |
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466 | boolean tasksEqual = false; |
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467 | if (task1.size() == task2.size()) { |
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468 | tasksEqual = true; |
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469 | for (int i = 0; i < task1.size(); i++) { |
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470 | if (!identityTaskComparator.equals(task1.get(i).getTask(), task2.get(i).getTask())) |
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471 | { |
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472 | tasksEqual = false; |
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473 | } |
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474 | } |
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475 | } |
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476 | |
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477 | if (tasksEqual) { |
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478 | foundTask = true; |
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479 | break; |
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480 | } |
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481 | } |
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482 | |
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483 | if (!foundTask) { |
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484 | System.out.println("different is " + task1); |
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485 | allTasksEqual = false; |
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486 | break; |
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487 | } |
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488 | } |
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489 | |
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490 | if (!allTasksEqual) { |
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491 | System.out.println(finder.getFoundTasks()); |
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492 | System.out.println(tasks); |
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493 | |
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494 | throw new IllegalArgumentException("both tries calculated different subsequences"); |
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495 | } |
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496 | |
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497 | /*TrieStatisticsDumper dumper = new TrieStatisticsDumper(); |
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498 | appData.getLastTrie().process(dumper); |
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499 | dumper.dumpCounters();*/ |
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500 | |
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501 | appData.setLastFoundTasks(tasks); |
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502 | |
---|
503 | Console.traceln(Level.FINE, "found " + appData.getLastFoundTasks().size() + " tasks " + |
---|
504 | "occurring " + appData.getLastFoundTasks().getOccurrenceCount() + " times"); |
---|
505 | } |
---|
506 | |
---|
507 | /** |
---|
508 | * @param appData the rule application data combining all data used for applying this rule |
---|
509 | */ |
---|
510 | private void createNewTrie(RuleApplicationData appData) { |
---|
511 | Console.traceln(Level.FINER, "training trie with a maximum sequence length of " + |
---|
512 | appData.getTrainedSequenceLength()); |
---|
513 | |
---|
514 | appData.getStopWatch().start("training trie"); |
---|
515 | |
---|
516 | // we prepared the task instances to refer to unique tasks, if they are treated |
---|
517 | // as equal. Therefore, we just compare the identity of the tasks of the task |
---|
518 | // instances |
---|
519 | appData.setLastTrie(new TaskInstanceTrie(identityTaskHandlingStrategy)); |
---|
520 | |
---|
521 | appData.getLastTrie().trainSessions |
---|
522 | (appData.getSessions(), appData.getTrainedSequenceLength()); |
---|
523 | |
---|
524 | appData.getStopWatch().stop("training trie"); |
---|
525 | } |
---|
526 | |
---|
527 | /** |
---|
528 | * @param appData the rule application data combining all data used for applying this rule |
---|
529 | */ |
---|
530 | private void replaceSequencesOccurringMostOften(RuleApplicationData appData) { |
---|
531 | appData.detectedAndReplacedTasks(false); |
---|
532 | |
---|
533 | if ((appData.getLastFoundTasks().size() > 0) && |
---|
534 | (appData.getLastFoundTasks().getOccurrenceCount() > 1)) |
---|
535 | { |
---|
536 | Console.traceln(Level.FINER, "replacing tasks occurrences"); |
---|
537 | |
---|
538 | for (List<ITaskInstance> task : appData.getLastFoundTasks()) { |
---|
539 | ISequence sequence = taskFactory.createNewSequence(); |
---|
540 | |
---|
541 | Console.traceln(Level.FINEST, "replacing " + sequence.getId() + ": " + task); |
---|
542 | |
---|
543 | List<ISequenceInstance> sequenceInstances = |
---|
544 | replaceTaskOccurrences(task, appData.getSessions(), sequence); |
---|
545 | |
---|
546 | harmonizeSequenceInstancesModel(sequence, sequenceInstances,task.size()); |
---|
547 | appData.detectedAndReplacedTasks |
---|
548 | (appData.detectedAndReplacedTasks() || (sequenceInstances.size() > 0)); |
---|
549 | |
---|
550 | if (sequenceInstances.size() < appData.getLastFoundTasks().getOccurrenceCount()) { |
---|
551 | Console.traceln(Level.FINE, sequence.getId() + ": replaced task only " + |
---|
552 | sequenceInstances.size() + " times instead of expected " + |
---|
553 | appData.getLastFoundTasks().getOccurrenceCount()); |
---|
554 | } |
---|
555 | } |
---|
556 | } |
---|
557 | |
---|
558 | } |
---|
559 | |
---|
560 | /** |
---|
561 | * |
---|
562 | */ |
---|
563 | private void harmonizeSequenceInstancesModel(ISequence sequence, |
---|
564 | List<ISequenceInstance> sequenceInstances, |
---|
565 | int sequenceLength) |
---|
566 | { |
---|
567 | TaskInstanceComparator comparator = preparationTaskHandlingStrategy.getTaskComparator(); |
---|
568 | |
---|
569 | // ensure for each subtask that lexically different variants are preserved |
---|
570 | for (int subTaskIndex = 0; subTaskIndex < sequenceLength; subTaskIndex++) { |
---|
571 | List<ITask> subTaskVariants = new LinkedList<ITask>(); |
---|
572 | |
---|
573 | for (ISequenceInstance sequenceInstance : sequenceInstances) { |
---|
574 | ITask candidate = sequenceInstance.get(subTaskIndex).getTask(); |
---|
575 | |
---|
576 | boolean found = false; |
---|
577 | |
---|
578 | for (int i = 0; i < subTaskVariants.size(); i++) { |
---|
579 | if (comparator.areLexicallyEqual(subTaskVariants.get(i), candidate)) { |
---|
580 | taskBuilder.setTask |
---|
581 | (sequenceInstance.get(subTaskIndex), subTaskVariants.get(i)); |
---|
582 | |
---|
583 | found = true; |
---|
584 | break; |
---|
585 | } |
---|
586 | } |
---|
587 | |
---|
588 | if (!found) { |
---|
589 | subTaskVariants.add(candidate); |
---|
590 | } |
---|
591 | } |
---|
592 | |
---|
593 | // if there are more than one lexically different variant of the sub task at |
---|
594 | // the considered position, adapt the sequence model at that position to have |
---|
595 | // a selection of the different variants. In this case also adapt the |
---|
596 | // generated sequence instances to correctly contain selection instances. If |
---|
597 | // there is only one variant of sub tasks at the given position, simply set |
---|
598 | // this variant as the sub task of the selection. In this case, the instances |
---|
599 | // can be preserved as is |
---|
600 | if (subTaskVariants.size() > 1) { |
---|
601 | ISelection selection = taskFactory.createNewSelection(); |
---|
602 | |
---|
603 | for (ITask variant : subTaskVariants) { |
---|
604 | taskBuilder.addChild(selection, variant); |
---|
605 | } |
---|
606 | |
---|
607 | taskBuilder.addChild(sequence, selection); |
---|
608 | |
---|
609 | for (ISequenceInstance instance : sequenceInstances) { |
---|
610 | ISelectionInstance selectionInstance = |
---|
611 | taskFactory.createNewTaskInstance(selection); |
---|
612 | taskBuilder.setChild(selectionInstance, instance.get(subTaskIndex)); |
---|
613 | taskBuilder.setTaskInstance(instance, subTaskIndex, selectionInstance); |
---|
614 | } |
---|
615 | } |
---|
616 | else if (subTaskVariants.size() == 1) { |
---|
617 | taskBuilder.addChild(sequence, subTaskVariants.get(0)); |
---|
618 | } |
---|
619 | } |
---|
620 | } |
---|
621 | |
---|
622 | /** |
---|
623 | * @param tree |
---|
624 | */ |
---|
625 | private List<ISequenceInstance> replaceTaskOccurrences(List<ITaskInstance> task, |
---|
626 | List<IUserSession> sessions, |
---|
627 | ISequence temporalTaskModel) |
---|
628 | { |
---|
629 | List<ISequenceInstance> sequenceInstances = new LinkedList<ISequenceInstance>(); |
---|
630 | |
---|
631 | for (IUserSession session : sessions) { |
---|
632 | int index = -1; |
---|
633 | |
---|
634 | do { |
---|
635 | index = getSubListIndex(session, task, ++index); |
---|
636 | |
---|
637 | if (index > -1) { |
---|
638 | sequenceInstances.add |
---|
639 | (RuleUtils.createNewSubSequenceInRange |
---|
640 | (session, index, index + task.size() - 1, temporalTaskModel, |
---|
641 | taskFactory, taskBuilder)); |
---|
642 | } |
---|
643 | } |
---|
644 | while (index > -1); |
---|
645 | } |
---|
646 | |
---|
647 | return sequenceInstances; |
---|
648 | } |
---|
649 | |
---|
650 | /** |
---|
651 | * @param trie |
---|
652 | * @param object |
---|
653 | * @return |
---|
654 | */ |
---|
655 | private int getSubListIndex(ITaskInstanceList list, |
---|
656 | List<ITaskInstance> subList, |
---|
657 | int startIndex) |
---|
658 | { |
---|
659 | boolean matchFound; |
---|
660 | int result = -1; |
---|
661 | |
---|
662 | for (int i = startIndex; i <= list.size() - subList.size(); i++) { |
---|
663 | matchFound = true; |
---|
664 | |
---|
665 | for (int j = 0; j < subList.size(); j++) { |
---|
666 | // we prepared the task instances to refer to unique tasks, if they are treated |
---|
667 | // as equal. Therefore, we just compare the identity of the tasks of the task |
---|
668 | // instances |
---|
669 | if (list.get(i + j).getTask() != subList.get(j).getTask()) { |
---|
670 | matchFound = false; |
---|
671 | break; |
---|
672 | } |
---|
673 | } |
---|
674 | |
---|
675 | if (matchFound) { |
---|
676 | result = i; |
---|
677 | break; |
---|
678 | } |
---|
679 | } |
---|
680 | |
---|
681 | return result; |
---|
682 | } |
---|
683 | |
---|
684 | /** |
---|
685 | * @param trie |
---|
686 | * @param object |
---|
687 | * @return |
---|
688 | */ |
---|
689 | private int getSubListIndex(List<ITaskInstance> list, |
---|
690 | List<ITaskInstance> subList, |
---|
691 | int startIndex) |
---|
692 | { |
---|
693 | boolean matchFound; |
---|
694 | int result = -1; |
---|
695 | |
---|
696 | for (int i = startIndex; i <= list.size() - subList.size(); i++) { |
---|
697 | matchFound = true; |
---|
698 | |
---|
699 | for (int j = 0; j < subList.size(); j++) { |
---|
700 | // we prepared the task instances to refer to unique tasks, if they are treated |
---|
701 | // as equal. Therefore, we just compare the identity of the tasks of the task |
---|
702 | // instances |
---|
703 | if (list.get(i + j) != subList.get(j)) { |
---|
704 | matchFound = false; |
---|
705 | break; |
---|
706 | } |
---|
707 | } |
---|
708 | |
---|
709 | if (matchFound) { |
---|
710 | result = i; |
---|
711 | break; |
---|
712 | } |
---|
713 | } |
---|
714 | |
---|
715 | return result; |
---|
716 | } |
---|
717 | |
---|
718 | /** |
---|
719 | * @author Patrick Harms |
---|
720 | */ |
---|
721 | private class MaxCountAndLongestTasksFinder implements TrieProcessor<ITaskInstance> { |
---|
722 | |
---|
723 | /** |
---|
724 | * |
---|
725 | */ |
---|
726 | private int currentCount; |
---|
727 | |
---|
728 | /** |
---|
729 | * |
---|
730 | */ |
---|
731 | private List<List<ITaskInstance>> foundTasks = new LinkedList<List<ITaskInstance>>(); |
---|
732 | |
---|
733 | /** |
---|
734 | * |
---|
735 | */ |
---|
736 | public MaxCountAndLongestTasksFinder() { |
---|
737 | super(); |
---|
738 | this.currentCount = 0; |
---|
739 | } |
---|
740 | |
---|
741 | /* (non-Javadoc) |
---|
742 | * @see de.ugoe.cs.autoquest.usageprofiles.TrieProcessor#process(java.util.List, int) |
---|
743 | */ |
---|
744 | @Override |
---|
745 | public TrieProcessor.Result process(List<ITaskInstance> foundTask, int count) { |
---|
746 | if (foundTask.size() < 2) { |
---|
747 | // ignore single tasks |
---|
748 | return TrieProcessor.Result.CONTINUE; |
---|
749 | } |
---|
750 | |
---|
751 | if (count < 2) { |
---|
752 | // ignore singular occurrences |
---|
753 | return TrieProcessor.Result.SKIP_NODE; |
---|
754 | } |
---|
755 | |
---|
756 | if (this.currentCount > count) { |
---|
757 | // ignore this children of this task, as they may have only smaller counts than |
---|
758 | // the already found tasks |
---|
759 | return TrieProcessor.Result.SKIP_NODE; |
---|
760 | } |
---|
761 | |
---|
762 | if (this.currentCount < count) { |
---|
763 | // the provided task occurs more often that all tasks found so far. |
---|
764 | // clear all found tasks and use the new count as the one searched for |
---|
765 | foundTasks.clear(); |
---|
766 | this.currentCount = count; |
---|
767 | } |
---|
768 | |
---|
769 | if (this.currentCount == count) { |
---|
770 | // the task is of interest. Sort it into the other found tasks so that |
---|
771 | // the longest come first |
---|
772 | boolean added = false; |
---|
773 | for (int i = 0; i < foundTasks.size(); i++) { |
---|
774 | if (foundTasks.get(i).size() < foundTask.size()) { |
---|
775 | // defensive copy |
---|
776 | foundTasks.add(i, new LinkedList<ITaskInstance>(foundTask)); // defensive copy |
---|
777 | added = true; |
---|
778 | break; |
---|
779 | } |
---|
780 | } |
---|
781 | |
---|
782 | if (!added) { |
---|
783 | foundTasks.add(new LinkedList<ITaskInstance>(foundTask)); // defensive copy |
---|
784 | } |
---|
785 | } |
---|
786 | |
---|
787 | return TrieProcessor.Result.CONTINUE; |
---|
788 | } |
---|
789 | |
---|
790 | /** |
---|
791 | * @return |
---|
792 | */ |
---|
793 | public Tasks getFoundTasks() { |
---|
794 | removePermutationsOfShorterTasks(); |
---|
795 | return new Tasks(currentCount, foundTasks); |
---|
796 | } |
---|
797 | |
---|
798 | /** |
---|
799 | * |
---|
800 | */ |
---|
801 | private void removePermutationsOfShorterTasks() { |
---|
802 | // now iterate the sorted list and for each task remove all other tasks that are shorter |
---|
803 | // (i.e. come later in the sorted list) and that represent a subpart of the task |
---|
804 | for (int i = 0; i < foundTasks.size(); i++) { |
---|
805 | for (int j = i + 1; j < foundTasks.size();) { |
---|
806 | if (foundTasks.get(j).size() < foundTasks.get(i).size()) { |
---|
807 | // found a task that is a potential subtask. Check for this and remove the |
---|
808 | // subtask if needed |
---|
809 | List<ITaskInstance> longTask = foundTasks.get(i); |
---|
810 | List<ITaskInstance> shortTask = foundTasks.get(j); |
---|
811 | |
---|
812 | if (getSubListIndex(longTask, shortTask, 0) > -1) { |
---|
813 | foundTasks.remove(j); |
---|
814 | } |
---|
815 | else { |
---|
816 | j++; |
---|
817 | } |
---|
818 | } |
---|
819 | else { |
---|
820 | j++; |
---|
821 | } |
---|
822 | } |
---|
823 | } |
---|
824 | } |
---|
825 | |
---|
826 | } |
---|
827 | |
---|
828 | // /** |
---|
829 | // * @author Patrick Harms |
---|
830 | // */ |
---|
831 | // private class TrieStatisticsDumper implements TrieProcessor<ITaskInstance> { |
---|
832 | // |
---|
833 | // /** |
---|
834 | // * |
---|
835 | // */ |
---|
836 | // private Map<Integer, Integer> counters = new HashMap<Integer, Integer>(); |
---|
837 | // |
---|
838 | // /* (non-Javadoc) |
---|
839 | // * @see de.ugoe.cs.autoquest.usageprofiles.TrieProcessor#process(java.util.List, int) |
---|
840 | // */ |
---|
841 | // @Override |
---|
842 | // public TrieProcessor.Result process(List<ITaskInstance> subsequence, int count) { |
---|
843 | // if (subsequence.size() == 1) { |
---|
844 | // Integer value = counters.get(count); |
---|
845 | // |
---|
846 | // if (value == null) { |
---|
847 | // value = 0; |
---|
848 | // } |
---|
849 | // |
---|
850 | // counters.put(count, value + 1); |
---|
851 | // |
---|
852 | // return TrieProcessor.Result.CONTINUE; |
---|
853 | // } |
---|
854 | // else { |
---|
855 | // // ignore singular occurrences |
---|
856 | // return TrieProcessor.Result.SKIP_NODE; |
---|
857 | // } |
---|
858 | // } |
---|
859 | // |
---|
860 | // /** |
---|
861 | // * @return |
---|
862 | // */ |
---|
863 | // public void dumpCounters() { |
---|
864 | // int dumpedCounters = 0; |
---|
865 | // |
---|
866 | // int count = 1; |
---|
867 | // while (dumpedCounters < counters.size()) { |
---|
868 | // Integer value = counters.get(count++); |
---|
869 | // if (value != null) { |
---|
870 | // System.out.println(value + " symbols occurred " + count + " times"); |
---|
871 | // dumpedCounters++; |
---|
872 | // } |
---|
873 | // } |
---|
874 | // } |
---|
875 | // |
---|
876 | // } |
---|
877 | |
---|
878 | /** |
---|
879 | * |
---|
880 | */ |
---|
881 | private static class RuleApplicationData { |
---|
882 | |
---|
883 | /** |
---|
884 | * |
---|
885 | */ |
---|
886 | private List<IUserSession> sessions; |
---|
887 | |
---|
888 | /** |
---|
889 | * |
---|
890 | */ |
---|
891 | private TaskInstanceTrie lastTrie; |
---|
892 | |
---|
893 | /** |
---|
894 | * default and minimum trained sequence length is 3 |
---|
895 | */ |
---|
896 | private int trainedSequenceLength = 3; |
---|
897 | |
---|
898 | /** |
---|
899 | * |
---|
900 | */ |
---|
901 | private Tasks lastFoundTasks = new Tasks(Integer.MAX_VALUE, null); |
---|
902 | |
---|
903 | /** |
---|
904 | * |
---|
905 | */ |
---|
906 | private boolean detectedAndReplacedTasks; |
---|
907 | |
---|
908 | /** |
---|
909 | * |
---|
910 | */ |
---|
911 | private RuleApplicationResult result = new RuleApplicationResult(); |
---|
912 | |
---|
913 | /** |
---|
914 | * |
---|
915 | */ |
---|
916 | private StopWatch stopWatch = new StopWatch(); |
---|
917 | |
---|
918 | /** |
---|
919 | * |
---|
920 | */ |
---|
921 | private RuleApplicationData(List<IUserSession> sessions) { |
---|
922 | this.sessions = sessions; |
---|
923 | } |
---|
924 | |
---|
925 | /** |
---|
926 | * @return the tree |
---|
927 | */ |
---|
928 | private List<IUserSession> getSessions() { |
---|
929 | return sessions; |
---|
930 | } |
---|
931 | |
---|
932 | /** |
---|
933 | * @param lastTrie the lastTrie to set |
---|
934 | */ |
---|
935 | private void setLastTrie(TaskInstanceTrie lastTrie) { |
---|
936 | this.lastTrie = lastTrie; |
---|
937 | } |
---|
938 | |
---|
939 | /** |
---|
940 | * @return the lastTrie |
---|
941 | */ |
---|
942 | private TaskInstanceTrie getLastTrie() { |
---|
943 | return lastTrie; |
---|
944 | } |
---|
945 | |
---|
946 | /** |
---|
947 | * @param trainedSequenceLength the trainedSequenceLength to set |
---|
948 | */ |
---|
949 | private void setTrainedSequenceLength(int trainedSequenceLength) { |
---|
950 | this.trainedSequenceLength = trainedSequenceLength; |
---|
951 | } |
---|
952 | |
---|
953 | /** |
---|
954 | * @return the trainedSequenceLength |
---|
955 | */ |
---|
956 | private int getTrainedSequenceLength() { |
---|
957 | return trainedSequenceLength; |
---|
958 | } |
---|
959 | |
---|
960 | /** |
---|
961 | * @param lastFoundSequences the lastFoundSequences to set |
---|
962 | */ |
---|
963 | private void setLastFoundTasks(Tasks lastFoundSequences) { |
---|
964 | this.lastFoundTasks = lastFoundSequences; |
---|
965 | } |
---|
966 | |
---|
967 | /** |
---|
968 | * @return the lastFoundSequences |
---|
969 | */ |
---|
970 | private Tasks getLastFoundTasks() { |
---|
971 | return lastFoundTasks; |
---|
972 | } |
---|
973 | |
---|
974 | /** |
---|
975 | * |
---|
976 | */ |
---|
977 | private void detectedAndReplacedTasks(boolean detectedAndReplacedTasks) { |
---|
978 | this.detectedAndReplacedTasks = detectedAndReplacedTasks; |
---|
979 | } |
---|
980 | |
---|
981 | /** |
---|
982 | * |
---|
983 | */ |
---|
984 | private boolean detectedAndReplacedTasks() { |
---|
985 | return detectedAndReplacedTasks; |
---|
986 | } |
---|
987 | |
---|
988 | /** |
---|
989 | * @return the result |
---|
990 | */ |
---|
991 | private RuleApplicationResult getResult() { |
---|
992 | return result; |
---|
993 | } |
---|
994 | |
---|
995 | /** |
---|
996 | * @return the stopWatch |
---|
997 | */ |
---|
998 | private StopWatch getStopWatch() { |
---|
999 | return stopWatch; |
---|
1000 | } |
---|
1001 | |
---|
1002 | } |
---|
1003 | |
---|
1004 | |
---|
1005 | /** |
---|
1006 | * @author Patrick Harms |
---|
1007 | */ |
---|
1008 | private static class Tasks implements Iterable<List<ITaskInstance>> { |
---|
1009 | |
---|
1010 | /** |
---|
1011 | * |
---|
1012 | */ |
---|
1013 | private int occurrenceCount; |
---|
1014 | |
---|
1015 | /** |
---|
1016 | * |
---|
1017 | */ |
---|
1018 | private List<List<ITaskInstance>> sequences; |
---|
1019 | |
---|
1020 | /** |
---|
1021 | * @param occurrenceCount |
---|
1022 | * @param sequences |
---|
1023 | */ |
---|
1024 | private Tasks(int occurrenceCount, List<List<ITaskInstance>> sequences) { |
---|
1025 | super(); |
---|
1026 | this.occurrenceCount = occurrenceCount; |
---|
1027 | this.sequences = sequences; |
---|
1028 | } |
---|
1029 | |
---|
1030 | /** |
---|
1031 | * @return |
---|
1032 | */ |
---|
1033 | private int getOccurrenceCount() { |
---|
1034 | return occurrenceCount; |
---|
1035 | } |
---|
1036 | |
---|
1037 | /** |
---|
1038 | * @return |
---|
1039 | */ |
---|
1040 | private int size() { |
---|
1041 | return this.sequences.size(); |
---|
1042 | } |
---|
1043 | |
---|
1044 | /** |
---|
1045 | * |
---|
1046 | */ |
---|
1047 | |
---|
1048 | /* (non-Javadoc) |
---|
1049 | * @see java.lang.Iterable#iterator() |
---|
1050 | */ |
---|
1051 | @Override |
---|
1052 | public Iterator<List<ITaskInstance>> iterator() { |
---|
1053 | return this.sequences.iterator(); |
---|
1054 | } |
---|
1055 | |
---|
1056 | /* (non-Javadoc) |
---|
1057 | * @see java.lang.Object#toString() |
---|
1058 | */ |
---|
1059 | @Override |
---|
1060 | public String toString() { |
---|
1061 | StringBuffer result = new StringBuffer(); |
---|
1062 | result.append(this.occurrenceCount); |
---|
1063 | result.append(" occurrences:\n"); |
---|
1064 | |
---|
1065 | for (List<ITaskInstance> task : sequences) { |
---|
1066 | result.append(task); |
---|
1067 | result.append("\n"); |
---|
1068 | } |
---|
1069 | |
---|
1070 | return result.toString(); |
---|
1071 | } |
---|
1072 | |
---|
1073 | } |
---|
1074 | |
---|
1075 | // methods for internal testing |
---|
1076 | // private void checkMatchingOfSessions(List<List<Event>> flattenedSessions, |
---|
1077 | // List<IUserSession> sessions, |
---|
1078 | // String when) |
---|
1079 | // { |
---|
1080 | // List<List<Event>> currentFlattenedSessions = flattenSessions(sessions); |
---|
1081 | // if (flattenedSessions.size() != currentFlattenedSessions.size()) { |
---|
1082 | // System.out.println("################## number of sessions changed after " + when); |
---|
1083 | // } |
---|
1084 | // else { |
---|
1085 | // for (int i = 0; i < flattenedSessions.size(); i++) { |
---|
1086 | // List<Event> expected = flattenedSessions.get(i); |
---|
1087 | // List<Event> current = currentFlattenedSessions.get(i); |
---|
1088 | // |
---|
1089 | // if (expected.size() != current.size()) { |
---|
1090 | // System.out.println |
---|
1091 | // ("################## length of session " + i + " changed after " + when); |
---|
1092 | // } |
---|
1093 | // else { |
---|
1094 | // for (int j = 0; j < expected.size(); j++) { |
---|
1095 | // if (!expected.get(j).equals(current.get(j))) { |
---|
1096 | // System.out.println("################## event " + j + " of session " + |
---|
1097 | // i + " changed after " + when); |
---|
1098 | // } |
---|
1099 | // } |
---|
1100 | // } |
---|
1101 | // } |
---|
1102 | // } |
---|
1103 | // } |
---|
1104 | // |
---|
1105 | // private List<List<Event>> flattenSessions(List<IUserSession> sessions) { |
---|
1106 | // List<List<Event>> flattenedSessions = new ArrayList<List<Event>>(); |
---|
1107 | // for (IUserSession session : sessions) { |
---|
1108 | // List<Event> flattenedUserSession = new ArrayList<Event>(); |
---|
1109 | // flatten(session, flattenedUserSession); |
---|
1110 | // flattenedSessions.add(flattenedUserSession); |
---|
1111 | // } |
---|
1112 | // |
---|
1113 | // return flattenedSessions; |
---|
1114 | // } |
---|
1115 | // |
---|
1116 | // private void flatten(IUserSession iUserSession, List<Event> flattenedUserSession) { |
---|
1117 | // for (ITaskInstance instance : iUserSession) { |
---|
1118 | // flatten(instance, flattenedUserSession); |
---|
1119 | // } |
---|
1120 | // } |
---|
1121 | // |
---|
1122 | // private void flatten(ITaskInstance instance, List<Event> flattenedUserSession) { |
---|
1123 | // if (instance instanceof ITaskInstanceList) { |
---|
1124 | // for (ITaskInstance child : (ITaskInstanceList) instance) { |
---|
1125 | // flatten(child, flattenedUserSession); |
---|
1126 | // } |
---|
1127 | // } |
---|
1128 | // else if (instance instanceof ISelectionInstance) { |
---|
1129 | // flatten(((ISelectionInstance) instance).getChild(), flattenedUserSession); |
---|
1130 | // } |
---|
1131 | // else if (instance instanceof IOptionalInstance) { |
---|
1132 | // flatten(((IOptionalInstance) instance).getChild(), flattenedUserSession); |
---|
1133 | // } |
---|
1134 | // else if (instance instanceof IEventTaskInstance) { |
---|
1135 | // flattenedUserSession.add(((IEventTaskInstance) instance).getEvent()); |
---|
1136 | // } |
---|
1137 | // } |
---|
1138 | |
---|
1139 | } |
---|