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source: branches/HeuristicLab.EvolutionTracking/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/SymbolicDataAnalysisProblem.cs @ 14827

Last change on this file since 14827 was 14312, checked in by bburlacu, 8 years ago

#1772: Merge trunk changes. Delete unnecessary files (sliding window).
File size: 22.6 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 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;
23using System.Drawing;
24using System.Linq;
25using HeuristicLab.Common;
26using HeuristicLab.Common.Resources;
27using HeuristicLab.Core;
28using HeuristicLab.Data;
29using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
30using HeuristicLab.Optimization;
31using HeuristicLab.Parameters;
32using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
33using HeuristicLab.PluginInfrastructure;
34using HeuristicLab.Problems.Instances;
35
36namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
37  [StorableClass]
38  public abstract class SymbolicDataAnalysisProblem<T, U, V> : HeuristicOptimizationProblem<U, V>, IDataAnalysisProblem<T>, ISymbolicDataAnalysisProblem, IStorableContent,
39    IProblemInstanceConsumer<T>, IProblemInstanceExporter<T>
40    where T : class, IDataAnalysisProblemData
41    where U : class, ISymbolicDataAnalysisEvaluator<T>
42    where V : class, ISymbolicDataAnalysisSolutionCreator {
43
44    #region parameter names & descriptions
45    private const string ProblemDataParameterName = "ProblemData";
46    private const string SymbolicExpressionTreeGrammarParameterName = "SymbolicExpressionTreeGrammar";
47    private const string SymbolicExpressionTreeInterpreterParameterName = "SymbolicExpressionTreeInterpreter";
48    private const string MaximumSymbolicExpressionTreeDepthParameterName = "MaximumSymbolicExpressionTreeDepth";
49    private const string MaximumSymbolicExpressionTreeLengthParameterName = "MaximumSymbolicExpressionTreeLength";
50    private const string MaximumFunctionDefinitionsParameterName = "MaximumFunctionDefinitions";
51    private const string MaximumFunctionArgumentsParameterName = "MaximumFunctionArguments";
52    private const string RelativeNumberOfEvaluatedSamplesParameterName = "RelativeNumberOfEvaluatedSamples";
53    private const string FitnessCalculationPartitionParameterName = "FitnessCalculationPartition";
54    private const string ValidationPartitionParameterName = "ValidationPartition";
55    private const string ApplyLinearScalingParameterName = "ApplyLinearScaling";
56
57    private const string ProblemDataParameterDescription = "";
58    private const string SymbolicExpressionTreeGrammarParameterDescription = "The grammar that should be used for symbolic expression tree.";
59    private const string SymoblicExpressionTreeInterpreterParameterDescription = "The interpreter that should be used to evaluate the symbolic expression tree.";
60    private const string MaximumSymbolicExpressionTreeDepthParameterDescription = "Maximal depth of the symbolic expression. The minimum depth needed for the algorithm is 3 because two levels are reserved for the ProgramRoot and the Start symbol.";
61    private const string MaximumSymbolicExpressionTreeLengthParameterDescription = "Maximal length of the symbolic expression.";
62    private const string MaximumFunctionDefinitionsParameterDescription = "Maximal number of automatically defined functions";
63    private const string MaximumFunctionArgumentsParameterDescription = "Maximal number of arguments of automatically defined functions.";
64    private const string RelativeNumberOfEvaluatedSamplesParameterDescription = "The relative number of samples of the dataset partition, which should be randomly chosen for evaluation.";
65    private const string FitnessCalculationPartitionParameterDescription = "The partition of the problem data training partition, that should be used to calculate the fitness of an individual.";
66    private const string ValidationPartitionParameterDescription = "The partition of the problem data training partition, that should be used to select the best model from (optional).";
67    private const string ApplyLinearScalingParameterDescription = "Flag that indicates if the individual should be linearly scaled before evaluating.";
68    #endregion
69
70    #region parameter properties
71    IParameter IDataAnalysisProblem.ProblemDataParameter {
72      get { return ProblemDataParameter; }
73    }
74    public IValueParameter<T> ProblemDataParameter {
75      get { return (IValueParameter<T>)Parameters[ProblemDataParameterName]; }
76    }
77    public IValueParameter<ISymbolicDataAnalysisGrammar> SymbolicExpressionTreeGrammarParameter {
78      get { return (IValueParameter<ISymbolicDataAnalysisGrammar>)Parameters[SymbolicExpressionTreeGrammarParameterName]; }
79    }
80    public IValueParameter<ISymbolicDataAnalysisExpressionTreeInterpreter> SymbolicExpressionTreeInterpreterParameter {
81      get { return (IValueParameter<ISymbolicDataAnalysisExpressionTreeInterpreter>)Parameters[SymbolicExpressionTreeInterpreterParameterName]; }
82    }
83    public IFixedValueParameter<IntValue> MaximumSymbolicExpressionTreeDepthParameter {
84      get { return (IFixedValueParameter<IntValue>)Parameters[MaximumSymbolicExpressionTreeDepthParameterName]; }
85    }
86    public IFixedValueParameter<IntValue> MaximumSymbolicExpressionTreeLengthParameter {
87      get { return (IFixedValueParameter<IntValue>)Parameters[MaximumSymbolicExpressionTreeLengthParameterName]; }
88    }
89    public IFixedValueParameter<IntValue> MaximumFunctionDefinitionsParameter {
90      get { return (IFixedValueParameter<IntValue>)Parameters[MaximumFunctionDefinitionsParameterName]; }
91    }
92    public IFixedValueParameter<IntValue> MaximumFunctionArgumentsParameter {
93      get { return (IFixedValueParameter<IntValue>)Parameters[MaximumFunctionArgumentsParameterName]; }
94    }
95    public IFixedValueParameter<PercentValue> RelativeNumberOfEvaluatedSamplesParameter {
96      get { return (IFixedValueParameter<PercentValue>)Parameters[RelativeNumberOfEvaluatedSamplesParameterName]; }
97    }
98    public IFixedValueParameter<IntRange> FitnessCalculationPartitionParameter {
99      get { return (IFixedValueParameter<IntRange>)Parameters[FitnessCalculationPartitionParameterName]; }
100    }
101    public IFixedValueParameter<IntRange> ValidationPartitionParameter {
102      get { return (IFixedValueParameter<IntRange>)Parameters[ValidationPartitionParameterName]; }
103    }
104    public IFixedValueParameter<BoolValue> ApplyLinearScalingParameter {
105      get { return (IFixedValueParameter<BoolValue>)Parameters[ApplyLinearScalingParameterName]; }
106    }
107    #endregion
108
109    #region properties
110    public string Filename { get; set; }
111    public static new Image StaticItemImage { get { return VSImageLibrary.Type; } }
112
113    IDataAnalysisProblemData IDataAnalysisProblem.ProblemData {
114      get { return ProblemData; }
115    }
116    public T ProblemData {
117      get { return ProblemDataParameter.Value; }
118      set { ProblemDataParameter.Value = value; }
119    }
120
121    public ISymbolicDataAnalysisGrammar SymbolicExpressionTreeGrammar {
122      get { return SymbolicExpressionTreeGrammarParameter.Value; }
123      set { SymbolicExpressionTreeGrammarParameter.Value = value; }
124    }
125    public ISymbolicDataAnalysisExpressionTreeInterpreter SymbolicExpressionTreeInterpreter {
126      get { return SymbolicExpressionTreeInterpreterParameter.Value; }
127      set { SymbolicExpressionTreeInterpreterParameter.Value = value; }
128    }
129
130    public IntValue MaximumSymbolicExpressionTreeDepth {
131      get { return MaximumSymbolicExpressionTreeDepthParameter.Value; }
132    }
133    public IntValue MaximumSymbolicExpressionTreeLength {
134      get { return MaximumSymbolicExpressionTreeLengthParameter.Value; }
135    }
136    public IntValue MaximumFunctionDefinitions {
137      get { return MaximumFunctionDefinitionsParameter.Value; }
138    }
139    public IntValue MaximumFunctionArguments {
140      get { return MaximumFunctionArgumentsParameter.Value; }
141    }
142    public PercentValue RelativeNumberOfEvaluatedSamples {
143      get { return RelativeNumberOfEvaluatedSamplesParameter.Value; }
144    }
145
146    public IntRange FitnessCalculationPartition {
147      get { return FitnessCalculationPartitionParameter.Value; }
148    }
149    public IntRange ValidationPartition {
150      get { return ValidationPartitionParameter.Value; }
151    }
152    public BoolValue ApplyLinearScaling {
153      get { return ApplyLinearScalingParameter.Value; }
154    }
155    #endregion
156
157    [StorableConstructor]
158    protected SymbolicDataAnalysisProblem(bool deserializing) : base(deserializing) { }
159    [StorableHook(HookType.AfterDeserialization)]
160    private void AfterDeserialization() {
161      if (!Parameters.ContainsKey(ApplyLinearScalingParameterName)) {
162        Parameters.Add(new FixedValueParameter<BoolValue>(ApplyLinearScalingParameterName, ApplyLinearScalingParameterDescription, new BoolValue(false)));
163        ApplyLinearScalingParameter.Hidden = true;
164
165        //it is assumed that for all symbolic regression algorithms linear scaling was set to true
166        //there is no possibility to determine the previous value of the parameter as it was stored in the evaluator
167        if (GetType().Name.Contains("SymbolicRegression"))
168          ApplyLinearScaling.Value = true;
169      }
170
171      RegisterEventHandlers();
172    }
173    protected SymbolicDataAnalysisProblem(SymbolicDataAnalysisProblem<T, U, V> original, Cloner cloner)
174      : base(original, cloner) {
175      RegisterEventHandlers();
176    }
177
178    protected SymbolicDataAnalysisProblem(T problemData, U evaluator, V solutionCreator)
179      : base(evaluator, solutionCreator) {
180      Parameters.Add(new ValueParameter<T>(ProblemDataParameterName, ProblemDataParameterDescription, problemData));
181      Parameters.Add(new ValueParameter<ISymbolicDataAnalysisGrammar>(SymbolicExpressionTreeGrammarParameterName, SymbolicExpressionTreeGrammarParameterDescription));
182      Parameters.Add(new ValueParameter<ISymbolicDataAnalysisExpressionTreeInterpreter>(SymbolicExpressionTreeInterpreterParameterName, SymoblicExpressionTreeInterpreterParameterDescription));
183      Parameters.Add(new FixedValueParameter<IntValue>(MaximumSymbolicExpressionTreeDepthParameterName, MaximumSymbolicExpressionTreeDepthParameterDescription));
184      Parameters.Add(new FixedValueParameter<IntValue>(MaximumSymbolicExpressionTreeLengthParameterName, MaximumSymbolicExpressionTreeLengthParameterDescription));
185      Parameters.Add(new FixedValueParameter<IntValue>(MaximumFunctionDefinitionsParameterName, MaximumFunctionDefinitionsParameterDescription));
186      Parameters.Add(new FixedValueParameter<IntValue>(MaximumFunctionArgumentsParameterName, MaximumFunctionArgumentsParameterDescription));
187      Parameters.Add(new FixedValueParameter<IntRange>(FitnessCalculationPartitionParameterName, FitnessCalculationPartitionParameterDescription));
188      Parameters.Add(new FixedValueParameter<IntRange>(ValidationPartitionParameterName, ValidationPartitionParameterDescription));
189      Parameters.Add(new FixedValueParameter<PercentValue>(RelativeNumberOfEvaluatedSamplesParameterName, RelativeNumberOfEvaluatedSamplesParameterDescription, new PercentValue(1)));
190      Parameters.Add(new FixedValueParameter<BoolValue>(ApplyLinearScalingParameterName, ApplyLinearScalingParameterDescription, new BoolValue(false)));
191
192      SymbolicExpressionTreeInterpreterParameter.Hidden = true;
193      MaximumFunctionArgumentsParameter.Hidden = true;
194      MaximumFunctionDefinitionsParameter.Hidden = true;
195      ApplyLinearScalingParameter.Hidden = true;
196
197      SymbolicExpressionTreeGrammar = new TypeCoherentExpressionGrammar();
198      SymbolicExpressionTreeInterpreter = new SymbolicDataAnalysisExpressionTreeLinearInterpreter();
199
200      FitnessCalculationPartition.Start = ProblemData.TrainingPartition.Start;
201      FitnessCalculationPartition.End = ProblemData.TrainingPartition.End;
202
203      InitializeOperators();
204
205      UpdateGrammar();
206      RegisterEventHandlers();
207    }
208
209    protected virtual void UpdateGrammar() {
210      SymbolicExpressionTreeGrammar.MaximumFunctionArguments = MaximumFunctionArguments.Value;
211      SymbolicExpressionTreeGrammar.MaximumFunctionDefinitions = MaximumFunctionDefinitions.Value;
212      foreach (var varSymbol in SymbolicExpressionTreeGrammar.Symbols.OfType<HeuristicLab.Problems.DataAnalysis.Symbolic.Variable>()) {
213        if (!varSymbol.Fixed) {
214          varSymbol.AllVariableNames = ProblemData.InputVariables.Select(x => x.Value);
215          varSymbol.VariableNames = ProblemData.AllowedInputVariables;
216        }
217      }
218      foreach (var varSymbol in SymbolicExpressionTreeGrammar.Symbols.OfType<HeuristicLab.Problems.DataAnalysis.Symbolic.VariableCondition>()) {
219        if (!varSymbol.Fixed) {
220          varSymbol.AllVariableNames = ProblemData.InputVariables.Select(x => x.Value);
221          varSymbol.VariableNames = ProblemData.AllowedInputVariables;
222        }
223      }
224    }
225
226    private void InitializeOperators() {
227      Operators.AddRange(ApplicationManager.Manager.GetInstances<ISymbolicExpressionTreeOperator>());
228      Operators.AddRange(ApplicationManager.Manager.GetInstances<ISymbolicDataAnalysisExpressionCrossover<T>>());
229      Operators.Add(new SymbolicExpressionSymbolFrequencyAnalyzer());
230      Operators.Add(new SymbolicDataAnalysisVariableFrequencyAnalyzer());
231      Operators.Add(new MinAverageMaxSymbolicExpressionTreeLengthAnalyzer());
232      Operators.Add(new SymbolicExpressionTreeLengthAnalyzer());
233      Operators.Add(new SymbolicExpressionTreeBottomUpSimilarityCalculator());
234      Operators.Add(new SymbolicDataAnalysisBottomUpDiversityAnalyzer(Operators.OfType<SymbolicExpressionTreeBottomUpSimilarityCalculator>().First()));
235      Operators.Add(new SymbolicDataAnalysisGenealogyAnalyzer());
236      ParameterizeOperators();
237    }
238
239    #region events
240    private void RegisterEventHandlers() {
241      ProblemDataParameter.ValueChanged += new EventHandler(ProblemDataParameter_ValueChanged);
242      ProblemDataParameter.Value.Changed += (object sender, EventArgs e) => OnProblemDataChanged();
243
244      SymbolicExpressionTreeGrammarParameter.ValueChanged += new EventHandler(SymbolicExpressionTreeGrammarParameter_ValueChanged);
245
246      MaximumFunctionArguments.ValueChanged += new EventHandler(ArchitectureParameterValue_ValueChanged);
247      MaximumFunctionDefinitions.ValueChanged += new EventHandler(ArchitectureParameterValue_ValueChanged);
248      MaximumSymbolicExpressionTreeDepth.ValueChanged += new EventHandler(MaximumSymbolicExpressionTreeDepth_ValueChanged);
249    }
250
251    private void ProblemDataParameter_ValueChanged(object sender, EventArgs e) {
252      ValidationPartition.Start = 0;
253      ValidationPartition.End = 0;
254      ProblemDataParameter.Value.Changed += (object s, EventArgs args) => OnProblemDataChanged();
255      OnProblemDataChanged();
256    }
257
258    private void SymbolicExpressionTreeGrammarParameter_ValueChanged(object sender, EventArgs e) {
259      UpdateGrammar();
260    }
261
262    private void ArchitectureParameterValue_ValueChanged(object sender, EventArgs e) {
263      UpdateGrammar();
264    }
265
266    private void MaximumSymbolicExpressionTreeDepth_ValueChanged(object sender, EventArgs e) {
267      if (MaximumSymbolicExpressionTreeDepth != null && MaximumSymbolicExpressionTreeDepth.Value < 3)
268        MaximumSymbolicExpressionTreeDepth.Value = 3;
269    }
270
271    protected override void OnSolutionCreatorChanged() {
272      base.OnSolutionCreatorChanged();
273      SolutionCreator.SymbolicExpressionTreeParameter.ActualNameChanged += new EventHandler(SolutionCreator_SymbolicExpressionTreeParameter_ActualNameChanged);
274      ParameterizeOperators();
275    }
276
277    private void SolutionCreator_SymbolicExpressionTreeParameter_ActualNameChanged(object sender, EventArgs e) {
278      ParameterizeOperators();
279    }
280
281    protected override void OnEvaluatorChanged() {
282      base.OnEvaluatorChanged();
283      ParameterizeOperators();
284    }
285
286    public event EventHandler ProblemDataChanged;
287    protected virtual void OnProblemDataChanged() {
288      FitnessCalculationPartition.Start = ProblemData.TrainingPartition.Start;
289      FitnessCalculationPartition.End = ProblemData.TrainingPartition.End;
290
291      UpdateGrammar();
292      ParameterizeOperators();
293
294      var handler = ProblemDataChanged;
295      if (handler != null) handler(this, EventArgs.Empty);
296
297      OnReset();
298    }
299    #endregion
300
301    protected virtual void ParameterizeOperators() {
302      var operators =
303        Parameters.OfType<IValueParameter>().Select(p => p.Value).OfType<IOperator>().Union(Operators).ToList();
304
305      foreach (var op in operators.OfType<ISymbolicExpressionTreeGrammarBasedOperator>()) {
306        op.SymbolicExpressionTreeGrammarParameter.ActualName = SymbolicExpressionTreeGrammarParameter.Name;
307      }
308      foreach (var op in operators.OfType<ISymbolicExpressionTreeSizeConstraintOperator>()) {
309        op.MaximumSymbolicExpressionTreeDepthParameter.ActualName = MaximumSymbolicExpressionTreeDepthParameter.Name;
310        op.MaximumSymbolicExpressionTreeLengthParameter.ActualName = MaximumSymbolicExpressionTreeLengthParameter.Name;
311      }
312      foreach (var op in operators.OfType<ISymbolicExpressionTreeArchitectureAlteringOperator>()) {
313        op.MaximumFunctionArgumentsParameter.ActualName = MaximumFunctionArgumentsParameter.Name;
314        op.MaximumFunctionDefinitionsParameter.ActualName = MaximumFunctionDefinitionsParameter.Name;
315      }
316      foreach (var op in operators.OfType<ISymbolicDataAnalysisEvaluator<T>>()) {
317        op.ProblemDataParameter.ActualName = ProblemDataParameterName;
318        op.SymbolicExpressionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
319        op.EvaluationPartitionParameter.ActualName = FitnessCalculationPartitionParameter.Name;
320        op.RelativeNumberOfEvaluatedSamplesParameter.ActualName = RelativeNumberOfEvaluatedSamplesParameter.Name;
321        op.ApplyLinearScalingParameter.ActualName = ApplyLinearScalingParameter.Name;
322      }
323      foreach (var op in operators.OfType<ISymbolicExpressionTreeCrossover>()) {
324        op.ParentsParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
325        op.SymbolicExpressionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
326      }
327      foreach (var op in operators.OfType<ISymbolicExpressionTreeManipulator>()) {
328        op.SymbolicExpressionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
329      }
330      foreach (var op in operators.OfType<ISymbolicExpressionTreeAnalyzer>()) {
331        op.SymbolicExpressionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
332      }
333      foreach (var op in operators.OfType<ISymbolicDataAnalysisSingleObjectiveAnalyzer>()) {
334        op.ApplyLinearScalingParameter.ActualName = ApplyLinearScalingParameter.Name;
335      }
336      foreach (var op in operators.OfType<ISymbolicDataAnalysisMultiObjectiveAnalyzer>()) {
337        op.ApplyLinearScalingParameter.ActualName = ApplyLinearScalingParameter.Name;
338      }
339      foreach (var op in operators.OfType<ISymbolicDataAnalysisAnalyzer>()) {
340        op.SymbolicExpressionTreeParameter.ActualName = SolutionCreator.SymbolicExpressionTreeParameter.ActualName;
341      }
342      foreach (var op in operators.OfType<ISymbolicDataAnalysisValidationAnalyzer<U, T>>()) {
343        op.RelativeNumberOfEvaluatedSamplesParameter.ActualName = RelativeNumberOfEvaluatedSamplesParameter.Name;
344        op.ValidationPartitionParameter.ActualName = ValidationPartitionParameter.Name;
345      }
346      foreach (var op in operators.OfType<ISymbolicDataAnalysisInterpreterOperator>()) {
347        op.SymbolicDataAnalysisTreeInterpreterParameter.ActualName = SymbolicExpressionTreeInterpreterParameter.Name;
348      }
349      foreach (var op in operators.OfType<ISymbolicDataAnalysisExpressionCrossover<T>>()) {
350        op.EvaluationPartitionParameter.ActualName = FitnessCalculationPartitionParameter.Name;
351        op.ProblemDataParameter.ActualName = ProblemDataParameter.Name;
352        op.EvaluationPartitionParameter.ActualName = FitnessCalculationPartitionParameter.Name;
353        op.RelativeNumberOfEvaluatedSamplesParameter.ActualName = RelativeNumberOfEvaluatedSamplesParameter.Name;
354        op.EvaluatorParameter.ActualName = EvaluatorParameter.Name;
355      }
356      // add tracking analyzer
357      foreach (var op in operators.OfType<SymbolicDataAnalysisGenealogyAnalyzer>()) {
358        op.BeforeCrossoverOperatorParameter.ActualValue = new SymbolicDataAnalysisExpressionBeforeCrossoverOperator();
359        op.AfterCrossoverOperatorParameter.ActualValue = new SymbolicDataAnalysisExpressionAfterCrossoverOperator();
360        op.BeforeManipulatorOperatorParameter.ActualValue =
361          new SymbolicDataAnalysisExpressionBeforeManipulatorOperator();
362        op.AfterManipulatorOperatorParameter.ActualValue = new SymbolicDataAnalysisExpressionAfterManipulatorOperator();
363        // get crossover parameter names
364        var crossover = operators.OfType<ISymbolicExpressionTreeCrossover>().FirstOrDefault();
365        if (crossover != null) {
366          op.BeforeCrossoverOperator.ParentsParameter.ActualName = crossover.ParentsParameter.Name;
367          op.AfterCrossoverOperator.ParentsParameter.ActualName = crossover.ParentsParameter.Name;
368          op.BeforeCrossoverOperator.ChildParameter.ActualName = crossover.SymbolicExpressionTreeParameter.Name;
369          op.AfterCrossoverOperator.ChildParameter.ActualName = crossover.SymbolicExpressionTreeParameter.Name;
370          // get manipulator parameter names
371          var manipulator = operators.OfType<ISymbolicExpressionTreeManipulator>().FirstOrDefault();
372          if (manipulator != null) {
373            op.BeforeManipulatorOperator.ChildParameter.ActualName = manipulator.SymbolicExpressionTreeParameter.Name;
374            op.AfterManipulatorOperator.ChildParameter.ActualName = manipulator.SymbolicExpressionTreeParameter.Name;
375          }
376          var creator = operators.OfType<ISymbolicExpressionTreeCreator>().FirstOrDefault();
377          if (creator != null) {
378            op.PopulationParameter.ActualName = creator.SymbolicExpressionTreeParameter.ActualName;
379          }
380        }
381      }
382    }
383
384    #region Import & Export
385    public virtual void Load(T data) {
386      Name = data.Name;
387      Description = data.Description;
388      ProblemData = data;
389    }
390
391    public virtual T Export() {
392      return ProblemData;
393    }
394    #endregion
395  }
396}
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