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source: trunk/sources/HeuristicLab.Problems.DataAnalysis.Regression/3.3/Symbolic/Analyzers/FixedValidationBestScaledSymbolicRegressionSolutionAnalyzer.cs @ 4313

Last change on this file since 4313 was 4246, checked in by gkronber, 14 years ago

Merged r4244 into trunk. #1082
File size: 19.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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
22using System.Collections.Generic;
23using System.Linq;
24using HeuristicLab.Analysis;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
28using HeuristicLab.Operators;
29using HeuristicLab.Optimization;
30using HeuristicLab.Parameters;
31using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
32using HeuristicLab.Problems.DataAnalysis.Evaluators;
33using HeuristicLab.Problems.DataAnalysis.Symbolic;
34
35namespace HeuristicLab.Problems.DataAnalysis.Regression.Symbolic.Analyzers {
36  /// <summary>
37  /// An operator that analyzes the validation best scaled symbolic regression solution.
38  /// </summary>
39  [Item("FixedValidationBestScaledSymbolicRegressionSolutionAnalyzer", "An operator that analyzes the validation best scaled symbolic regression solution.")]
40  [StorableClass]
41  public sealed class FixedValidationBestScaledSymbolicRegressionSolutionAnalyzer : SingleSuccessorOperator, ISymbolicRegressionAnalyzer {
42    private const string RandomParameterName = "Random";
43    private const string SymbolicExpressionTreeParameterName = "SymbolicExpressionTree";
44    private const string SymbolicExpressionTreeInterpreterParameterName = "SymbolicExpressionTreeInterpreter";
45    private const string ProblemDataParameterName = "ProblemData";
46    private const string ValidationSamplesStartParameterName = "SamplesStart";
47    private const string ValidationSamplesEndParameterName = "SamplesEnd";
48    // private const string QualityParameterName = "Quality";
49    private const string UpperEstimationLimitParameterName = "UpperEstimationLimit";
50    private const string LowerEstimationLimitParameterName = "LowerEstimationLimit";
51    private const string EvaluatorParameterName = "Evaluator";
52    private const string MaximizationParameterName = "Maximization";
53    private const string BestSolutionParameterName = "Best solution (validation)";
54    private const string BestSolutionQualityParameterName = "Best solution quality (validation)";
55    private const string CurrentBestValidationQualityParameterName = "Current best validation quality";
56    private const string BestSolutionQualityValuesParameterName = "Validation Quality";
57    private const string ResultsParameterName = "Results";
58    private const string VariableFrequenciesParameterName = "VariableFrequencies";
59    private const string BestKnownQualityParameterName = "BestKnownQuality";
60    private const string GenerationsParameterName = "Generations";
61    private const string RelativeNumberOfEvaluatedSamplesParameterName = "RelativeNumberOfEvaluatedSamples";
62
63    private const string TrainingMeanSquaredErrorQualityParameterName = "Mean squared error (training)";
64    private const string MinTrainingMeanSquaredErrorQualityParameterName = "Min mean squared error (training)";
65    private const string MaxTrainingMeanSquaredErrorQualityParameterName = "Max mean squared error (training)";
66    private const string AverageTrainingMeanSquaredErrorQualityParameterName = "Average mean squared error (training)";
67    private const string BestTrainingMeanSquaredErrorQualityParameterName = "Best mean squared error (training)";
68
69    private const string TrainingAverageRelativeErrorQualityParameterName = "Average relative error (training)";
70    private const string MinTrainingAverageRelativeErrorQualityParameterName = "Min average relative error (training)";
71    private const string MaxTrainingAverageRelativeErrorQualityParameterName = "Max average relative error (training)";
72    private const string AverageTrainingAverageRelativeErrorQualityParameterName = "Average average relative error (training)";
73    private const string BestTrainingAverageRelativeErrorQualityParameterName = "Best average relative error (training)";
74
75    private const string TrainingRSquaredQualityParameterName = "R² (training)";
76    private const string MinTrainingRSquaredQualityParameterName = "Min R² (training)";
77    private const string MaxTrainingRSquaredQualityParameterName = "Max R² (training)";
78    private const string AverageTrainingRSquaredQualityParameterName = "Average R² (training)";
79    private const string BestTrainingRSquaredQualityParameterName = "Best R² (training)";
80
81    private const string TestMeanSquaredErrorQualityParameterName = "Mean squared error (test)";
82    private const string MinTestMeanSquaredErrorQualityParameterName = "Min mean squared error (test)";
83    private const string MaxTestMeanSquaredErrorQualityParameterName = "Max mean squared error (test)";
84    private const string AverageTestMeanSquaredErrorQualityParameterName = "Average mean squared error (test)";
85    private const string BestTestMeanSquaredErrorQualityParameterName = "Best mean squared error (test)";
86
87    private const string TestAverageRelativeErrorQualityParameterName = "Average relative error (test)";
88    private const string MinTestAverageRelativeErrorQualityParameterName = "Min average relative error (test)";
89    private const string MaxTestAverageRelativeErrorQualityParameterName = "Max average relative error (test)";
90    private const string AverageTestAverageRelativeErrorQualityParameterName = "Average average relative error (test)";
91    private const string BestTestAverageRelativeErrorQualityParameterName = "Best average relative error (test)";
92
93    private const string TestRSquaredQualityParameterName = "R² (test)";
94    private const string MinTestRSquaredQualityParameterName = "Min R² (test)";
95    private const string MaxTestRSquaredQualityParameterName = "Max R² (test)";
96    private const string AverageTestRSquaredQualityParameterName = "Average R² (test)";
97    private const string BestTestRSquaredQualityParameterName = "Best R² (test)";
98
99    private const string RSquaredValuesParameterName = "R²";
100    private const string MeanSquaredErrorValuesParameterName = "Mean squared error";
101    private const string RelativeErrorValuesParameterName = "Average relative error";
102
103    #region parameter properties
104    public ILookupParameter<IRandom> RandomParameter {
105      get { return (ILookupParameter<IRandom>)Parameters[RandomParameterName]; }
106    }
107    public ScopeTreeLookupParameter<SymbolicExpressionTree> SymbolicExpressionTreeParameter {
108      get { return (ScopeTreeLookupParameter<SymbolicExpressionTree>)Parameters[SymbolicExpressionTreeParameterName]; }
109    }
110    public IValueLookupParameter<ISymbolicExpressionTreeInterpreter> SymbolicExpressionTreeInterpreterParameter {
111      get { return (IValueLookupParameter<ISymbolicExpressionTreeInterpreter>)Parameters[SymbolicExpressionTreeInterpreterParameterName]; }
112    }
113    public ILookupParameter<ISymbolicRegressionEvaluator> EvaluatorParameter {
114      get { return (ILookupParameter<ISymbolicRegressionEvaluator>)Parameters[EvaluatorParameterName]; }
115    }
116    public ILookupParameter<BoolValue> MaximizationParameter {
117      get { return (ILookupParameter<BoolValue>)Parameters[MaximizationParameterName]; }
118    }
119    public IValueLookupParameter<DataAnalysisProblemData> ProblemDataParameter {
120      get { return (IValueLookupParameter<DataAnalysisProblemData>)Parameters[ProblemDataParameterName]; }
121    }
122    public IValueLookupParameter<IntValue> ValidationSamplesStartParameter {
123      get { return (IValueLookupParameter<IntValue>)Parameters[ValidationSamplesStartParameterName]; }
124    }
125    public IValueLookupParameter<IntValue> ValidationSamplesEndParameter {
126      get { return (IValueLookupParameter<IntValue>)Parameters[ValidationSamplesEndParameterName]; }
127    }
128    public IValueParameter<PercentValue> RelativeNumberOfEvaluatedSamplesParameter {
129      get { return (IValueParameter<PercentValue>)Parameters[RelativeNumberOfEvaluatedSamplesParameterName]; }
130    }
131
132    public IValueLookupParameter<DoubleValue> UpperEstimationLimitParameter {
133      get { return (IValueLookupParameter<DoubleValue>)Parameters[UpperEstimationLimitParameterName]; }
134    }
135    public IValueLookupParameter<DoubleValue> LowerEstimationLimitParameter {
136      get { return (IValueLookupParameter<DoubleValue>)Parameters[LowerEstimationLimitParameterName]; }
137    }
138    public ILookupParameter<SymbolicRegressionSolution> BestSolutionParameter {
139      get { return (ILookupParameter<SymbolicRegressionSolution>)Parameters[BestSolutionParameterName]; }
140    }
141    public ILookupParameter<IntValue> GenerationsParameter {
142      get { return (ILookupParameter<IntValue>)Parameters[GenerationsParameterName]; }
143    }
144    public ILookupParameter<DoubleValue> BestSolutionQualityParameter {
145      get { return (ILookupParameter<DoubleValue>)Parameters[BestSolutionQualityParameterName]; }
146    }
147    public ILookupParameter<ResultCollection> ResultsParameter {
148      get { return (ILookupParameter<ResultCollection>)Parameters[ResultsParameterName]; }
149    }
150    public ILookupParameter<DoubleValue> BestKnownQualityParameter {
151      get { return (ILookupParameter<DoubleValue>)Parameters[BestKnownQualityParameterName]; }
152    }
153    public ILookupParameter<DataTable> VariableFrequenciesParameter {
154      get { return (ILookupParameter<DataTable>)Parameters[VariableFrequenciesParameterName]; }
155    }
156
157    #endregion
158    #region properties
159    public IRandom Random {
160      get { return RandomParameter.ActualValue; }
161    }
162    public ItemArray<SymbolicExpressionTree> SymbolicExpressionTree {
163      get { return SymbolicExpressionTreeParameter.ActualValue; }
164    }
165    public ISymbolicExpressionTreeInterpreter SymbolicExpressionTreeInterpreter {
166      get { return SymbolicExpressionTreeInterpreterParameter.ActualValue; }
167    }
168    public ISymbolicRegressionEvaluator Evaluator {
169      get { return EvaluatorParameter.ActualValue; }
170    }
171    public BoolValue Maximization {
172      get { return MaximizationParameter.ActualValue; }
173    }
174    public DataAnalysisProblemData ProblemData {
175      get { return ProblemDataParameter.ActualValue; }
176    }
177    public IntValue ValidiationSamplesStart {
178      get { return ValidationSamplesStartParameter.ActualValue; }
179    }
180    public IntValue ValidationSamplesEnd {
181      get { return ValidationSamplesEndParameter.ActualValue; }
182    }
183    public PercentValue RelativeNumberOfEvaluatedSamples {
184      get { return RelativeNumberOfEvaluatedSamplesParameter.Value; }
185    }
186
187    public DoubleValue UpperEstimationLimit {
188      get { return UpperEstimationLimitParameter.ActualValue; }
189    }
190    public DoubleValue LowerEstimationLimit {
191      get { return LowerEstimationLimitParameter.ActualValue; }
192    }
193    public ResultCollection Results {
194      get { return ResultsParameter.ActualValue; }
195    }
196    public DataTable VariableFrequencies {
197      get { return VariableFrequenciesParameter.ActualValue; }
198    }
199    public IntValue Generations {
200      get { return GenerationsParameter.ActualValue; }
201    }
202    public DoubleValue BestSolutionQuality {
203      get { return BestSolutionQualityParameter.ActualValue; }
204    }
205
206    #endregion
207
208    public FixedValidationBestScaledSymbolicRegressionSolutionAnalyzer()
209      : base() {
210      Parameters.Add(new LookupParameter<IRandom>(RandomParameterName, "The random generator to use."));
211      Parameters.Add(new LookupParameter<ISymbolicRegressionEvaluator>(EvaluatorParameterName, "The evaluator which should be used to evaluate the solution on the validation set."));
212      Parameters.Add(new ScopeTreeLookupParameter<SymbolicExpressionTree>(SymbolicExpressionTreeParameterName, "The symbolic expression trees to analyze."));
213      Parameters.Add(new LookupParameter<BoolValue>(MaximizationParameterName, "The direction of optimization."));
214      Parameters.Add(new ValueLookupParameter<ISymbolicExpressionTreeInterpreter>(SymbolicExpressionTreeInterpreterParameterName, "The interpreter that should be used for the analysis of symbolic expression trees."));
215      Parameters.Add(new ValueLookupParameter<DataAnalysisProblemData>(ProblemDataParameterName, "The problem data for which the symbolic expression tree is a solution."));
216      Parameters.Add(new ValueLookupParameter<IntValue>(ValidationSamplesStartParameterName, "The first index of the validation partition of the data set."));
217      Parameters.Add(new ValueLookupParameter<IntValue>(ValidationSamplesEndParameterName, "The last index of the validation partition of the data set."));
218      Parameters.Add(new ValueParameter<PercentValue>(RelativeNumberOfEvaluatedSamplesParameterName, "The relative number of samples of the dataset partition, which should be randomly chosen for evaluation between the start and end index.", new PercentValue(1)));
219      Parameters.Add(new ValueLookupParameter<DoubleValue>(UpperEstimationLimitParameterName, "The upper estimation limit that was set for the evaluation of the symbolic expression trees."));
220      Parameters.Add(new ValueLookupParameter<DoubleValue>(LowerEstimationLimitParameterName, "The lower estimation limit that was set for the evaluation of the symbolic expression trees."));
221      Parameters.Add(new LookupParameter<SymbolicRegressionSolution>(BestSolutionParameterName, "The best symbolic regression solution."));
222      Parameters.Add(new LookupParameter<IntValue>(GenerationsParameterName, "The number of generations calculated so far."));
223      Parameters.Add(new LookupParameter<DoubleValue>(BestSolutionQualityParameterName, "The quality of the best symbolic regression solution."));
224      Parameters.Add(new LookupParameter<ResultCollection>(ResultsParameterName, "The result collection where the best symbolic regression solution should be stored."));
225      Parameters.Add(new LookupParameter<DoubleValue>(BestKnownQualityParameterName, "The best known (validation) quality achieved on the data set."));
226      Parameters.Add(new LookupParameter<DataTable>(VariableFrequenciesParameterName, "The variable frequencies table to use for the calculation of variable impacts"));
227    }
228
229    [StorableConstructor]
230    private FixedValidationBestScaledSymbolicRegressionSolutionAnalyzer(bool deserializing) : base() { }
231
232    [StorableHook(HookType.AfterDeserialization)]
233    private void AfterDeserialization() {
234      #region compatibility remove before releasing 3.3.1
235      if (!Parameters.ContainsKey(EvaluatorParameterName)) {
236        Parameters.Add(new LookupParameter<ISymbolicRegressionEvaluator>(EvaluatorParameterName, "The evaluator which should be used to evaluate the solution on the validation set."));
237      }
238      if (!Parameters.ContainsKey(MaximizationParameterName)) {
239        Parameters.Add(new LookupParameter<BoolValue>(MaximizationParameterName, "The direction of optimization."));
240      }
241      #endregion
242    }
243
244    public override IOperation Apply() {
245      var trees = SymbolicExpressionTree;
246
247      string targetVariable = ProblemData.TargetVariable.Value;
248
249      // select a random subset of rows in the validation set
250      int validationStart = ValidiationSamplesStart.Value;
251      int validationEnd = ValidationSamplesEnd.Value;
252      int seed = Random.Next();
253      int count = (int)((validationEnd - validationStart) * RelativeNumberOfEvaluatedSamples.Value);
254      if (count == 0) count = 1;
255      IEnumerable<int> rows = RandomEnumerable.SampleRandomNumbers(seed, validationStart, validationEnd, count);
256
257      double upperEstimationLimit = UpperEstimationLimit != null ? UpperEstimationLimit.Value : double.PositiveInfinity;
258      double lowerEstimationLimit = LowerEstimationLimit != null ? LowerEstimationLimit.Value : double.NegativeInfinity;
259
260      double bestQuality = Maximization.Value ? double.NegativeInfinity : double.PositiveInfinity;
261      SymbolicExpressionTree bestTree = null;
262
263      foreach (var tree in trees) {
264        double quality = Evaluator.Evaluate(SymbolicExpressionTreeInterpreter, tree,
265          lowerEstimationLimit, upperEstimationLimit,
266          ProblemData.Dataset, targetVariable,
267         rows);
268
269        if ((Maximization.Value && quality > bestQuality) ||
270            (!Maximization.Value && quality < bestQuality)) {
271          bestQuality = quality;
272          bestTree = tree;
273        }
274      }
275
276      // if the best validation tree is better than the current best solution => update
277      bool newBest =
278        BestSolutionQuality == null ||
279        (Maximization.Value && bestQuality > BestSolutionQuality.Value) ||
280        (!Maximization.Value && bestQuality < BestSolutionQuality.Value);
281      if (newBest) {
282        // calculate scaling parameters and only for the best tree using the full training set
283        double alpha, beta;
284        int trainingStart = ProblemData.TrainingSamplesStart.Value;
285        int trainingEnd = ProblemData.TrainingSamplesEnd.Value;
286        IEnumerable<int> trainingRows = Enumerable.Range(trainingStart, trainingEnd - trainingStart);
287        SymbolicRegressionScaledMeanSquaredErrorEvaluator.Calculate(SymbolicExpressionTreeInterpreter, bestTree,
288          lowerEstimationLimit, upperEstimationLimit,
289          ProblemData.Dataset, targetVariable,
290          trainingRows, out beta, out alpha);
291
292        // scale tree for solution
293        var scaledTree = SymbolicRegressionSolutionLinearScaler.Scale(bestTree, alpha, beta);
294        var model = new SymbolicRegressionModel((ISymbolicExpressionTreeInterpreter)SymbolicExpressionTreeInterpreter.Clone(),
295          scaledTree);
296        var solution = new SymbolicRegressionSolution(ProblemData, model, lowerEstimationLimit, upperEstimationLimit);
297        solution.Name = BestSolutionParameterName;
298        solution.Description = "Best solution on validation partition found over the whole run.";
299
300        BestSolutionParameter.ActualValue = solution;
301        BestSolutionQualityParameter.ActualValue = new DoubleValue(bestQuality);
302
303        BestSymbolicRegressionSolutionAnalyzer.UpdateBestSolutionResults(solution, ProblemData, Results, Generations, VariableFrequencies);
304      }
305
306
307      if (!Results.ContainsKey(BestSolutionQualityValuesParameterName)) {
308        Results.Add(new Result(BestSolutionQualityValuesParameterName, new DataTable(BestSolutionQualityValuesParameterName, BestSolutionQualityValuesParameterName)));
309        Results.Add(new Result(BestSolutionQualityParameterName, new DoubleValue()));
310        Results.Add(new Result(CurrentBestValidationQualityParameterName, new DoubleValue()));
311      }
312      Results[BestSolutionQualityParameterName].Value = new DoubleValue(BestSolutionQualityParameter.ActualValue.Value);
313      Results[CurrentBestValidationQualityParameterName].Value = new DoubleValue(bestQuality);
314
315      DataTable validationValues = (DataTable)Results[BestSolutionQualityValuesParameterName].Value;
316      AddValue(validationValues, BestSolutionQualityParameter.ActualValue.Value, BestSolutionQualityParameterName, BestSolutionQualityParameterName);
317      AddValue(validationValues, bestQuality, CurrentBestValidationQualityParameterName, CurrentBestValidationQualityParameterName);
318      return base.Apply();
319    }
320
321    [StorableHook(HookType.AfterDeserialization)]
322    private void Initialize() { }
323
324    private static void AddValue(DataTable table, double data, string name, string description) {
325      DataRow row;
326      table.Rows.TryGetValue(name, out row);
327      if (row == null) {
328        row = new DataRow(name, description);
329        row.Values.Add(data);
330        table.Rows.Add(row);
331      } else {
332        row.Values.Add(data);
333      }
334    }
335  }
336}
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