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source: trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Analyzers/SymbolicExpressionTreeLengthAnalyzer.cs @ 13841

Last change on this file since 13841 was 12422, checked in by mkommend, 10 years ago

#2320: Merged the encoding class and all accompanying changes in the trunk.

File size: 13.1 KB
RevLine 
[6978]1#region License Information
2/* HeuristicLab
[12012]3 * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
[6978]4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
[7227]22using System;
[6978]23using System.Linq;
24using HeuristicLab.Analysis;
25using HeuristicLab.Common;
26using HeuristicLab.Core;
27using HeuristicLab.Data;
28using HeuristicLab.Operators;
29using HeuristicLab.Optimization;
30using HeuristicLab.Parameters;
31using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
32
33namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
34  /// <summary>
35  /// An operator that tracks tree lengths of Symbolic Expression Trees
36  /// </summary>
37  [Item("SymbolicExpressionTreeLengthAnalyzer", "An operator that tracks tree lengths of Symbolic Expression Trees")]
38  [StorableClass]
[7230]39  public sealed class SymbolicExpressionTreeLengthAnalyzer : SingleSuccessorOperator, ISymbolicExpressionTreeAnalyzer {
[6978]40    private const string SymbolicExpressionTreeParameterName = "SymbolicExpressionTree";
41    private const string MaximumSymbolicExpressionTreeLengthParameterName = "MaximumSymbolicExpressionTreeLength";
42    private const string SymbolicExpressionTreeLengthsParameterName = "SymbolicExpressionTreeLengthsTable";
43    private const string SymbolicExpressionTreeLengthsHistoryParameterName = "SymbolicExpressionTreeLengthsHistoryTable";
44    private const string ResultsParameterName = "Results";
45    private const string StoreHistoryParameterName = "StoreHistory";
46    private const string UpdateIntervalParameterName = "UpdateInterval";
47    private const string UpdateCounterParameterName = "UpdateCounter";
48
49    #region Parameter properties
50    public IScopeTreeLookupParameter<ISymbolicExpressionTree> SymbolicExpressionTreeParameter {
51      get { return (IScopeTreeLookupParameter<ISymbolicExpressionTree>)Parameters[SymbolicExpressionTreeParameterName]; }
52    }
[12422]53
54    public ILookupParameter<IntValue> MaximumSymbolicExpressionTreeLengthParameter {
55      get { return (ILookupParameter<IntValue>)Parameters[MaximumSymbolicExpressionTreeLengthParameterName]; }
56    }
[6978]57    public ValueLookupParameter<DataTable> SymbolicExpressionTreeLengthsParameter {
[7124]58      get { return (ValueLookupParameter<DataTable>)Parameters[SymbolicExpressionTreeLengthsParameterName]; }
[6978]59    }
60    public ValueLookupParameter<DataTableHistory> SymbolicExpressionTreeLengthsHistoryParameter {
[7124]61      get { return (ValueLookupParameter<DataTableHistory>)Parameters[SymbolicExpressionTreeLengthsHistoryParameterName]; }
[6978]62    }
63    public ValueLookupParameter<ResultCollection> ResultsParameter {
64      get { return (ValueLookupParameter<ResultCollection>)Parameters[ResultsParameterName]; }
65    }
66    // history
67    public ValueParameter<BoolValue> StoreHistoryParameter {
68      get { return (ValueParameter<BoolValue>)Parameters[StoreHistoryParameterName]; }
69    }
70    public ValueParameter<IntValue> UpdateIntervalParameter {
71      get { return (ValueParameter<IntValue>)Parameters[UpdateIntervalParameterName]; }
72    }
[7143]73    public ValueParameter<IntValue> UpdateCounterParameter {
74      get { return (ValueParameter<IntValue>)Parameters[UpdateCounterParameterName]; }
[6978]75    }
76    #endregion
[7124]77
[7143]78    #region Properties
[7172]79    public bool EnabledByDefault {
80      get { return true; }
81    }
[7143]82    public IntValue UpdateInterval {
83      get { return UpdateIntervalParameter.Value; }
84    }
85    public IntValue UpdateCounter {
86      get { return UpdateCounterParameter.Value; }
87    }
88    public BoolValue StoreHistory {
89      get { return StoreHistoryParameter.Value; }
90    }
91    #endregion
92
[6978]93    [StorableConstructor]
[8561]94    private SymbolicExpressionTreeLengthAnalyzer(bool deserializing) : base(deserializing) { }
[6978]95    private SymbolicExpressionTreeLengthAnalyzer(SymbolicExpressionTreeLengthAnalyzer original, Cloner cloner)
96      : base(original, cloner) {
97    }
98    public override IDeepCloneable Clone(Cloner cloner) {
99      return new SymbolicExpressionTreeLengthAnalyzer(this, cloner);
100    }
101    public SymbolicExpressionTreeLengthAnalyzer()
102      : base() {
103      Parameters.Add(new ScopeTreeLookupParameter<ISymbolicExpressionTree>(SymbolicExpressionTreeParameterName, "The symbolic expression tree whose length should be calculated."));
104      Parameters.Add(new LookupParameter<IntValue>(MaximumSymbolicExpressionTreeLengthParameterName, "The maximum allowed symbolic expression tree length"));
105      Parameters.Add(new ValueLookupParameter<DataTable>(SymbolicExpressionTreeLengthsParameterName, "The data table to store the symbolic expression tree lengths."));
106      Parameters.Add(new ValueLookupParameter<DataTableHistory>(SymbolicExpressionTreeLengthsHistoryParameterName, "The data table to store the symbolic expression tree lengths history."));
107      Parameters.Add(new ValueLookupParameter<ResultCollection>(ResultsParameterName, "The results collection where the analysis values should be stored."));
108      Parameters.Add(new ValueParameter<BoolValue>(StoreHistoryParameterName, "True if the tree lengths history of the population should be stored.", new BoolValue(false)));
109      Parameters.Add(new ValueParameter<IntValue>(UpdateIntervalParameterName, "The interval in which the tree length analysis should be applied.", new IntValue(1)));
[7143]110      Parameters.Add(new ValueParameter<IntValue>(UpdateCounterParameterName, "The value which counts how many times the operator was called since the last update", new IntValue(0)));
[6978]111
[7227]112      SymbolicExpressionTreeLengthsParameter.Hidden = true;
113      SymbolicExpressionTreeLengthsHistoryParameter.Hidden = true;
114      ResultsParameter.Hidden = true;
115      UpdateCounterParameter.Hidden = true;
[6978]116    }
117
118    [StorableHook(HookType.AfterDeserialization)]
119    private void AfterDeserialization() {
120      // check if all the parameters are present and accounted for
121      if (!Parameters.ContainsKey(StoreHistoryParameterName)) {
122        Parameters.Add(new ValueParameter<BoolValue>(StoreHistoryParameterName, "True if the tree lengths history of the population should be stored.", new BoolValue(false)));
123      }
124      if (!Parameters.ContainsKey(UpdateIntervalParameterName)) {
125        Parameters.Add(new ValueParameter<IntValue>(UpdateIntervalParameterName, "The interval in which the tree length analysis should be applied.", new IntValue(1)));
126      }
[7280]127      //necessary code to correct UpdateCounterParameter - type was changed from LookupParameter to ValueParameter
128      if (Parameters.ContainsKey(UpdateCounterParameterName) && (Parameters[UpdateCounterParameterName] is LookupParameter<IntValue>))
129        Parameters.Remove(UpdateCounterParameterName);
[7227]130      if (!Parameters.ContainsKey(UpdateCounterParameterName)) {
131        Parameters.Add(new ValueParameter<IntValue>(UpdateCounterParameterName, "The value which counts how many times the operator was called since the last update", new IntValue(0)));
132        UpdateCounterParameter.Hidden = true;
133      }
134    }
[7150]135
[7227]136    #region IStatefulItem members
[7230]137    public override void InitializeState() {
138      base.InitializeState();
[7227]139      UpdateCounter.Value = 0;
[6978]140    }
[7230]141    public override void ClearState() {
142      base.ClearState();
[7227]143      UpdateCounter.Value = 0;
144    }
145    #endregion
[6978]146
147    public override IOperation Apply() {
[7143]148      UpdateCounter.Value++;
[6978]149      // the analyzer runs periodically, every 'updateInterval' times
[7143]150      if (UpdateCounter.Value == UpdateInterval.Value) {
151        UpdateCounter.Value = 0; // reset counter
[6978]152
153        // compute all tree lengths and store them in the lengthsTable
154        var solutions = SymbolicExpressionTreeParameter.ActualValue;
155
156        var treeLengthsTable = SymbolicExpressionTreeLengthsParameter.ActualValue;
157        // if the table was not created yet, we create it here
158        if (treeLengthsTable == null) {
[7702]159          treeLengthsTable = new DataTable("Tree Length Histogram");
[6978]160          SymbolicExpressionTreeLengthsParameter.ActualValue = treeLengthsTable;
161        }
162
163        // data table which stores tree length values
[7124]164        DataRow treeLengthsTableRow;
[6978]165
[7124]166        const string treeLengthsTableRowName = "Symbolic expression tree lengths";
167        const string treeLengthsTableRowDesc = "The distribution of symbolic expression tree lengths";
168        const string xAxisTitle = "Symbolic expression tree lengths";
169        const string yAxisTitle = "Frequency / Number of tree individuals";
170
[7147]171        var treeLengths = solutions.Select(s => (int)s.Length).ToList();
[6978]172
[7147]173        int maxLength = treeLengths.Max(t => t);
174        int minLength = treeLengths.Min(t => t);
175
[7124]176        if (!treeLengthsTable.Rows.ContainsKey(treeLengthsTableRowName)) {
[7147]177          treeLengthsTableRow = new DataRow(treeLengthsTableRowName, treeLengthsTableRowDesc, treeLengths.Select(x => (double)x));
[7124]178          treeLengthsTable.Rows.Add(treeLengthsTableRow);
[6978]179        } else {
[7124]180          treeLengthsTableRow = treeLengthsTable.Rows[treeLengthsTableRowName];
[7147]181          treeLengthsTableRow.Values.Replace(treeLengths.Select(x => (double)x));
[6978]182        }
183
[12422]184        double maximumAllowedTreeLength = MaximumSymbolicExpressionTreeLengthParameter.ActualValue.Value;
[6978]185
[7124]186        treeLengthsTableRow.VisualProperties.ChartType = DataRowVisualProperties.DataRowChartType.Histogram;
187        treeLengthsTableRow.VisualProperties.ExactBins = false;
[6978]188
[7147]189        int range = maxLength - minLength;
190        if (range == 0) range = 1;
[7124]191        // the following trick should result in an integer intervalWidth of 1,2,4,...
[7147]192        treeLengthsTableRow.VisualProperties.Bins = range;
[6978]193
[7124]194        if (maxLength <= 25) // [0,25]
195          treeLengthsTableRow.VisualProperties.ScaleFactor = 1.0;
[7147]196        else if (maxLength <= 100) // [26,100]
[7124]197          treeLengthsTableRow.VisualProperties.ScaleFactor = 1.0 / 2.0;
[7147]198        else if (maxLength <= 250) // [101,250]
[7124]199          treeLengthsTableRow.VisualProperties.ScaleFactor = 1.0 / 5.0;
[6978]200        else if (maxLength <= 500) // [251,500]
[7124]201          treeLengthsTableRow.VisualProperties.ScaleFactor = 1.0 / 10.0;
[6978]202        else
[7124]203          treeLengthsTableRow.VisualProperties.ScaleFactor = 1.0 / 20.0; // [501,inf]
[6978]204
[7124]205        treeLengthsTableRow.VisualProperties.IsVisibleInLegend = false;
206
[6978]207        // visual properties for the X-axis
208        treeLengthsTable.VisualProperties.XAxisMinimumAuto = false;
209        treeLengthsTable.VisualProperties.XAxisMaximumAuto = false;
210        treeLengthsTable.VisualProperties.XAxisMinimumFixedValue = 0.0;
211        if (maxLength > maximumAllowedTreeLength + 1)
[7124]212          treeLengthsTable.VisualProperties.XAxisMaximumFixedValue = maxLength + 1; // +1 so the histogram column for the maximum length won't get trimmed
[6978]213        else
214          treeLengthsTable.VisualProperties.XAxisMaximumFixedValue = maximumAllowedTreeLength + 1;
[7124]215        treeLengthsTable.VisualProperties.XAxisTitle = xAxisTitle;
[7147]216        //visual properties for the Y-axis
[6978]217        treeLengthsTable.VisualProperties.YAxisMinimumAuto = false;
218        treeLengthsTable.VisualProperties.YAxisMaximumAuto = false;
219        treeLengthsTable.VisualProperties.YAxisMinimumFixedValue = 0.0;
[7223]220        int maxFreq = (int)Math.Round(solutions.GroupBy(s => s.Length).Max(g => g.Count()) / treeLengthsTableRow.VisualProperties.ScaleFactor);
[7150]221        if (maxFreq % 5 != 0)
222          maxFreq += (5 - maxFreq % 5);
223        double yAxisMaximumFixedValue = maxFreq;
[7147]224
225        treeLengthsTable.VisualProperties.YAxisMaximumFixedValue = yAxisMaximumFixedValue;
[7124]226        treeLengthsTable.VisualProperties.YAxisTitle = yAxisTitle;
[6978]227
228        var results = ResultsParameter.ActualValue;
229
[7124]230        if (!results.ContainsKey(treeLengthsTableRowName)) {
231          results.Add(new Result(treeLengthsTableRowName, treeLengthsTable));
[6978]232        } else {
[7124]233          results[treeLengthsTableRowName].Value = treeLengthsTable;
[6978]234        }
235
236        bool storeHistory = StoreHistoryParameter.Value.Value;
[7124]237        const string treeLengthHistoryTableName = "Tree lengths history";
[6978]238
239        if (storeHistory) {
240          var treeLengthsHistory = SymbolicExpressionTreeLengthsHistoryParameter.ActualValue;
241          if (treeLengthsHistory == null) {
242            treeLengthsHistory = new DataTableHistory();
243            SymbolicExpressionTreeLengthsHistoryParameter.ActualValue = treeLengthsHistory;
244          }
[7227]245          treeLengthsHistory.Add((DataTable)treeLengthsTable.Clone());
[6978]246
[7124]247          if (!results.ContainsKey(treeLengthHistoryTableName)) {
248            results.Add(new Result(treeLengthHistoryTableName, treeLengthsHistory));
[6978]249          } else {
[7124]250            results[treeLengthHistoryTableName].Value = treeLengthsHistory;
[6978]251          }
252        }
253      }
254      return base.Apply();
255    }
256  }
257}
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