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source: branches/3.0/sources/HeuristicLab.ES/ES.cs @ 17709

Last change on this file since 17709 was 98, checked in by abeham, 17 years ago

Added the DampeningFactor as variable as well so that Success Rule adjustment is completely configurable (ref ticket #77)
File size: 21.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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.Collections.Generic;
24using System.Text;
25using System.Xml;
26using HeuristicLab.Core;
27using HeuristicLab.Data;
28using HeuristicLab.SequentialEngine;
29using HeuristicLab.Operators;
30using HeuristicLab.Random;
31using HeuristicLab.Logging;
32using HeuristicLab.Selection;
33using HeuristicLab.Selection.OffspringSelection;
34using HeuristicLab.Evolutionary;
35
36namespace HeuristicLab.ES {
37  public class ES : ItemBase, IEditable {
38    #region Create Operators
39    public static void Create(IEngine engine) {
40      engine.OperatorGraph.Clear();
41
42      CombinedOperator co = CreateES();
43      co.Name = "ES";
44      engine.OperatorGraph.AddOperator(co);
45      engine.OperatorGraph.InitialOperator = co;
46
47      engine.Reset();
48    }
49    private static CombinedOperator CreateES() {
50      CombinedOperator op = new CombinedOperator();
51      SequentialProcessor sp = new SequentialProcessor();
52      op.OperatorGraph.AddOperator(sp);
53      op.OperatorGraph.InitialOperator = sp;
54
55      CombinedOperator co1 = CreateVariableInjection();
56      co1.Name = "Variable Injection";
57      op.OperatorGraph.AddOperator(co1);
58      sp.AddSubOperator(co1);
59
60      // place holder for ProblemInjector
61      EmptyOperator eo1 = new EmptyOperator();
62      eo1.Name = "ProblemInjector";
63      op.OperatorGraph.AddOperator(eo1);
64      co1.AddSubOperator(eo1);
65
66      CombinedOperator co2 = CreatePopulationInitialization();
67      co2.Name = "Population Initialization";
68      op.OperatorGraph.AddOperator(co2);
69      sp.AddSubOperator(co2);
70
71      // place holder for SolutionGenerator
72      EmptyOperator eo2 = new EmptyOperator();
73      eo2.Name = "SolutionGenerator";
74      op.OperatorGraph.AddOperator(eo2);
75      co2.AddSubOperator(eo2);
76
77      // place holder for Evaluator
78      EmptyOperator eo3 = new EmptyOperator();
79      eo3.Name = "Evaluator";
80      op.OperatorGraph.AddOperator(eo3);
81      co2.AddSubOperator(eo3);
82
83      CombinedOperator co3 = CreateESMain();
84      co3.Name = "ES Main";
85      op.OperatorGraph.AddOperator(co3);
86      sp.AddSubOperator(co3);
87
88      // place holder for Mutator
89      EmptyOperator eo4 = new EmptyOperator();
90      eo4.Name = "Mutator";
91      op.OperatorGraph.AddOperator(eo4);
92      co3.AddSubOperator(eo4);
93
94      // place holder for Evaluator
95      co3.AddSubOperator(eo3);
96
97      // place holder for Recombinator
98      EmptyOperator eo5 = new EmptyOperator();
99      eo5.Name = "Recombinator";
100      op.OperatorGraph.AddOperator(eo5);
101      co3.AddSubOperator(eo5);
102
103      return op;
104    }
105    private static CombinedOperator CreateVariableInjection() {
106      CombinedOperator op = new CombinedOperator();
107      SequentialProcessor sp = new SequentialProcessor();
108      op.OperatorGraph.AddOperator(sp);
109      op.OperatorGraph.InitialOperator = sp;
110
111      RandomInjector ri = new RandomInjector();
112      op.OperatorGraph.AddOperator(ri);
113      sp.AddSubOperator(ri);
114
115      OperatorExtractor oe = new OperatorExtractor();
116      oe.Name = "ProblemInjector";
117      oe.GetVariableInfo("Operator").ActualName = "ProblemInjector";
118      op.OperatorGraph.AddOperator(oe);
119      sp.AddSubOperator(oe);
120
121      VariableInjector vi = new VariableInjector();
122      vi.AddVariable(new Variable("ESmu", new IntData(1)));
123      vi.AddVariable(new Variable("ESrho", new IntData(1)));
124      vi.AddVariable(new Variable("ESlambda", new IntData(1)));
125      vi.AddVariable(new Variable("EvaluatedSolutions", new IntData()));
126      vi.AddVariable(new Variable("PlusNotation", new BoolData(true)));
127      vi.AddVariable(new Variable("Generations", new IntData()));
128      vi.AddVariable(new Variable("MaximumGenerations", new IntData(1000)));
129      vi.AddVariable(new Variable("LearningRate", new DoubleData(0.1)));
130      vi.AddVariable(new Variable("DampeningFactor", new DoubleData(10.0)));
131      vi.AddVariable(new Variable("ShakingFactor", new DoubleData(5.0)));
132      vi.AddVariable(new Variable("TargetSuccessProbability", new DoubleData(0.2)));
133      vi.AddVariable(new Variable("SuccessProbability", new DoubleData(0.2)));
134      vi.AddVariable(new Variable("UseSuccessRule", new BoolData(true)));
135      op.OperatorGraph.AddOperator(vi);
136      sp.AddSubOperator(vi);
137
138      return op;
139    }
140    private static CombinedOperator CreatePopulationInitialization() {
141      CombinedOperator op = new CombinedOperator();
142      SequentialProcessor sp1 = new SequentialProcessor();
143      op.OperatorGraph.AddOperator(sp1);
144      op.OperatorGraph.InitialOperator = sp1;
145
146      SubScopesCreater ssc = new SubScopesCreater();
147      ssc.GetVariableInfo("SubScopes").ActualName = "ESmu";
148      op.OperatorGraph.AddOperator(ssc);
149      sp1.AddSubOperator(ssc);
150
151      UniformSequentialSubScopesProcessor ussp = new UniformSequentialSubScopesProcessor();
152      op.OperatorGraph.AddOperator(ussp);
153      sp1.AddSubOperator(ussp);
154
155      SequentialProcessor sp2 = new SequentialProcessor();
156      op.OperatorGraph.AddOperator(sp2);
157      ussp.AddSubOperator(sp2);
158
159      OperatorExtractor oe1 = new OperatorExtractor();
160      oe1.Name = "SolutionGenerator";
161      oe1.GetVariableInfo("Operator").ActualName = "SolutionGenerator";
162      op.OperatorGraph.AddOperator(oe1);
163      sp2.AddSubOperator(oe1);
164
165      OperatorExtractor oe2 = new OperatorExtractor();
166      oe2.Name = "Evaluator";
167      oe2.GetVariableInfo("Operator").ActualName = "Evaluator";
168      op.OperatorGraph.AddOperator(oe2);
169      sp2.AddSubOperator(oe2);
170
171      Counter c = new Counter();
172      c.GetVariableInfo("Value").ActualName = "EvaluatedSolutions";
173      op.OperatorGraph.AddOperator(c);
174      sp2.AddSubOperator(c);
175
176      Sorter s = new Sorter();
177      s.GetVariableInfo("Descending").ActualName = "Maximization";
178      s.GetVariableInfo("Value").ActualName = "Quality";
179      op.OperatorGraph.AddOperator(s);
180      sp1.AddSubOperator(s);
181
182      return op;
183    }
184    private static CombinedOperator CreateESMain() {
185      CombinedOperator op = new CombinedOperator();
186      SequentialProcessor sp = new SequentialProcessor();
187      op.OperatorGraph.AddOperator(sp);
188      op.OperatorGraph.InitialOperator = sp;
189
190      ESRandomSelector rs = new ESRandomSelector();
191      rs.Name = "Child Selector";
192      rs.GetVariableInfo("Lambda").ActualName = "ESlambda";
193      rs.GetVariableInfo("Rho").ActualName = "ESrho";
194      op.OperatorGraph.AddOperator(rs);
195      sp.AddSubOperator(rs);
196
197      SequentialSubScopesProcessor ssp = new SequentialSubScopesProcessor();
198      op.OperatorGraph.AddOperator(ssp);
199      sp.AddSubOperator(ssp);
200
201      EmptyOperator eo = new EmptyOperator();
202      op.OperatorGraph.AddOperator(eo);
203      ssp.AddSubOperator(eo);
204
205      CombinedOperator co1 = CreateCreateChildren();
206      co1.Name = "Create Children";
207      op.OperatorGraph.AddOperator(co1);
208      ssp.AddSubOperator(co1);
209
210      ConditionalBranch cb1 = new ConditionalBranch();
211      cb1.Name = "Plus or Comma Replacement";
212      cb1.GetVariableInfo("Condition").ActualName = "PlusNotation";
213      op.OperatorGraph.AddOperator(cb1);
214      sp.AddSubOperator(cb1);
215
216      MergingReducer mr = new MergingReducer();
217      mr.Name = "Plus Replacement";
218      op.OperatorGraph.AddOperator(mr);
219      cb1.AddSubOperator(mr);
220
221      RightReducer rr = new RightReducer();
222      rr.Name = "Comma Replacement";
223      op.OperatorGraph.AddOperator(rr);
224      cb1.AddSubOperator(rr);
225
226      CombinedOperator co2 = CreateReplacement();
227      co2.Name = "Parents Selection";
228      op.OperatorGraph.AddOperator(co2);
229      sp.AddSubOperator(co2);
230
231      QualityLogger ql = new QualityLogger();
232      op.OperatorGraph.AddOperator(ql);
233      sp.AddSubOperator(ql);
234
235      BestAverageWorstQualityCalculator bawqc = new BestAverageWorstQualityCalculator();
236      op.OperatorGraph.AddOperator(bawqc);
237      sp.AddSubOperator(bawqc);
238
239      DataCollector dc = new DataCollector();
240      ItemList<StringData> names = dc.GetVariable("VariableNames").GetValue<ItemList<StringData>>();
241      names.Add(new StringData("BestQuality"));
242      names.Add(new StringData("AverageQuality"));
243      names.Add(new StringData("WorstQuality"));
244      op.OperatorGraph.AddOperator(dc);
245      sp.AddSubOperator(dc);
246
247      LinechartInjector lci = new LinechartInjector();
248      lci.GetVariableInfo("Linechart").ActualName = "Quality Linechart";
249      lci.GetVariable("NumberOfLines").GetValue<IntData>().Data = 3;
250      op.OperatorGraph.AddOperator(lci);
251      sp.AddSubOperator(lci);
252
253      Counter c = new Counter();
254      c.GetVariableInfo("Value").ActualName = "Generations";
255      op.OperatorGraph.AddOperator(c);
256      sp.AddSubOperator(c);
257
258      LessThanComparator ltc = new LessThanComparator();
259      ltc.GetVariableInfo("LeftSide").ActualName = "Generations";
260      ltc.GetVariableInfo("RightSide").ActualName = "MaximumGenerations";
261      ltc.GetVariableInfo("Result").ActualName = "GenerationsCondition";
262      op.OperatorGraph.AddOperator(ltc);
263      sp.AddSubOperator(ltc);
264
265      ConditionalBranch cb2 = new ConditionalBranch();
266      cb2.GetVariableInfo("Condition").ActualName = "GenerationsCondition";
267      op.OperatorGraph.AddOperator(cb2);
268      sp.AddSubOperator(cb2);
269
270      cb2.AddSubOperator(sp);
271
272      return op;
273    }
274    private static CombinedOperator CreateCreateChildren() {
275      CombinedOperator op = new CombinedOperator();
276      SequentialProcessor sp1 = new SequentialProcessor();
277      op.OperatorGraph.AddOperator(sp1);
278      op.OperatorGraph.InitialOperator = sp1;
279
280      ConditionalBranch cb = new ConditionalBranch();
281      cb.GetVariableInfo("Condition").ActualName = "UseSuccessRule";
282      op.OperatorGraph.AddOperator(cb);
283      sp1.AddSubOperator(cb);
284
285      SequentialProcessor sp2 = new SequentialProcessor();
286      op.OperatorGraph.AddOperator(sp2);
287      cb.AddSubOperator(sp2);
288
289      OffspringAnalyzer oa = new OffspringAnalyzer();
290      oa.Name = "Offspring Analyzer";
291      oa.GetVariable("ParentsCount").Value = new IntData(1);
292      oa.GetVariable("ComparisonFactor").Value = new DoubleData(0.0);
293      op.OperatorGraph.AddOperator(oa);
294      sp2.AddSubOperator(oa);
295
296      SequentialProcessor sp3 = new SequentialProcessor();
297      op.OperatorGraph.AddOperator(sp3);
298      oa.AddSubOperator(sp3);
299      cb.AddSubOperator(sp3);
300
301      OperatorExtractor oe1 = new OperatorExtractor();
302      oe1.Name = "Recombinator";
303      oe1.GetVariableInfo("Operator").ActualName = "Recombinator";
304      op.OperatorGraph.AddOperator(oe1);
305      sp3.AddSubOperator(oe1);
306
307      UniformSequentialSubScopesProcessor ussp = new UniformSequentialSubScopesProcessor();
308      op.OperatorGraph.AddOperator(ussp);
309      sp3.AddSubOperator(ussp);
310
311      SequentialProcessor sp4 = new SequentialProcessor();
312      op.OperatorGraph.AddOperator(sp4);
313      ussp.AddSubOperator(sp4);
314
315      OperatorExtractor oe2 = new OperatorExtractor();
316      oe2.Name = "Mutator";
317      oe2.GetVariableInfo("Operator").ActualName = "Mutator";
318      op.OperatorGraph.AddOperator(oe2);
319      sp4.AddSubOperator(oe2);
320
321      OperatorExtractor oe3 = new OperatorExtractor();
322      oe3.Name = "Evaluator";
323      oe3.GetVariableInfo("Operator").ActualName = "Evaluator";
324      op.OperatorGraph.AddOperator(oe3);
325      sp4.AddSubOperator(oe3);
326
327      Counter c = new Counter();
328      c.GetVariableInfo("Value").ActualName = "EvaluatedSolutions";
329      op.OperatorGraph.AddOperator(c);
330      sp4.AddSubOperator(c);
331
332      SuccessRuleMutationStrengthAdjuster srmsa = new SuccessRuleMutationStrengthAdjuster();
333      srmsa.Name = "SuccessRuleMutationStrengthAdjuster";
334      op.OperatorGraph.AddOperator(srmsa);
335      sp2.AddSubOperator(srmsa);
336
337      Sorter s = new Sorter();
338      s.GetVariableInfo("Value").ActualName = "Quality";
339      s.GetVariableInfo("Descending").ActualName = "Maximization";
340      op.OperatorGraph.AddOperator(s);
341      sp1.AddSubOperator(s);
342
343      return op;
344    }
345    private static CombinedOperator CreateReplacement() {
346      CombinedOperator op = new CombinedOperator();
347      SequentialProcessor sp1 = new SequentialProcessor();
348      op.OperatorGraph.AddOperator(sp1);
349      op.OperatorGraph.InitialOperator = sp1;
350
351      Sorter s = new Sorter();
352      s.GetVariableInfo("Descending").ActualName = "Maximization";
353      s.GetVariableInfo("Value").ActualName = "Quality";
354      op.OperatorGraph.AddOperator(s);
355      sp1.AddSubOperator(s);
356
357      LeftSelector ls = new LeftSelector();
358      ls.Name = "Parents Selector";
359      ls.GetVariableInfo("Selected").ActualName = "ESmu";
360      ls.GetVariable("CopySelected").Value = new BoolData(false);
361      op.OperatorGraph.AddOperator(ls);
362      sp1.AddSubOperator(ls);
363
364      RightReducer rr = new RightReducer();
365      rr.Name = "RightReducer";
366      op.OperatorGraph.AddOperator(rr);
367      sp1.AddSubOperator(rr);
368
369      return op;
370    }
371    #endregion
372
373    #region Properties
374    private IEngine myEngine;
375    public IEngine Engine {
376      get { return myEngine; }
377    }
378    private BoolData mySetSeedRandomly;
379    public bool SetSeedRandomly {
380      get { return mySetSeedRandomly.Data; }
381      set { mySetSeedRandomly.Data = value; }
382    }
383    private IntData mySeed;
384    public int Seed {
385      get { return mySeed.Data; }
386      set {
387        mySeed.Data = value;
388        OnChanged();
389      }
390    }
391    private IntData myMu;
392    public int Mu {
393      get { return myMu.Data; }
394      set {
395        if (value > 0) {
396          myMu.Data = value;
397          if (!PlusNotation && value >= Lambda) myLambda.Data = value + 1;
398          if (value < Rho) myRho.Data = value;
399          OnChanged();
400        }
401      }
402    }
403    private IntData myRho;
404    public int Rho {
405      get { return myRho.Data; }
406      set {
407        if (value > 0) {
408          myRho.Data = value;
409          if (value > Mu) Mu = value;
410          OnChanged();
411        }
412      }
413    }
414    private IntData myLambda;
415    public int Lambda {
416      get { return myLambda.Data; }
417      set {
418        if (value > 0) {
419          if (PlusNotation) myLambda.Data = value;
420          else {
421            if (value > 1 && value < Mu) {
422              myLambda.Data = value;
423              myMu.Data = value - 1;
424            } else if (value == 1) {
425              myMu.Data = 1;
426              myLambda.Data = 2;
427            } else if (value > Mu) {
428              myLambda.Data = value;
429            }
430          }
431          OnChanged();
432        }
433      }
434    }
435    private BoolData myPlusNotation;
436    public bool PlusNotation {
437      get { return myPlusNotation.Data; }
438      set {
439        if (!value && myPlusNotation.Data) { // from plus to point
440          if (Lambda <= Mu) {
441            myLambda.Data = Mu + 1;
442          }
443        }
444        myPlusNotation.Data = value;
445        OnChanged();
446      }
447    }
448    private DoubleData myShakingFactor;
449    public double ShakingFactor {
450      get { return myShakingFactor.Data; }
451      set { myShakingFactor.Data = value; }
452    }
453    private DoubleData mySuccessProbability;
454    private DoubleData myTargetSuccessProbability;
455    public double SuccessProbability {
456      get { return myTargetSuccessProbability.Data; }
457      set {
458        myTargetSuccessProbability.Data = value;
459        mySuccessProbability.Data = value;
460      }
461    }
462    private DoubleData myLearningRate;
463    public double LearningRate {
464      get { return myLearningRate.Data; }
465      set {
466        if (value > 0.0 && value <= 1.0) {
467          myLearningRate.Data = value;
468          OnChanged();
469        }
470      }
471    }
472    private DoubleData myDampeningFactor;
473    public double DampeningFactor {
474      get { return myDampeningFactor.Data; }
475      set {
476        if (value >= 1.0) {
477          myDampeningFactor.Data = value;
478          OnChanged();
479        }
480      }
481    }
482    private IntData myMaximumGenerations;
483    public int MaximumGenerations {
484      get { return myMaximumGenerations.Data; }
485      set { myMaximumGenerations.Data = value; }
486    }
487    private BoolData myUseSuccessRule;
488    public bool UseSuccessRule {
489      get { return myUseSuccessRule.Data; }
490      set { myUseSuccessRule.Data = value; }
491    }
492    private CombinedOperator myES;
493    private IOperator myESMain;
494    private IOperator myVariableInjection;
495    public IOperator ProblemInjector {
496      get { return myVariableInjection.SubOperators[0]; }
497      set {
498        value.Name = "ProblemInjector";
499        myES.OperatorGraph.RemoveOperator(ProblemInjector.Guid);
500        myES.OperatorGraph.AddOperator(value);
501        myVariableInjection.AddSubOperator(value, 0);
502      }
503    }
504    private IOperator myPopulationInitialization;
505    public IOperator SolutionGenerator {
506      get { return myPopulationInitialization.SubOperators[0]; }
507      set {
508        value.Name = "SolutionGenerator";
509        myES.OperatorGraph.RemoveOperator(SolutionGenerator.Guid);
510        myES.OperatorGraph.AddOperator(value);
511        myPopulationInitialization.AddSubOperator(value, 0);
512      }
513    }
514    public IOperator Evaluator {
515      get { return myPopulationInitialization.SubOperators[1]; }
516      set {
517        value.Name = "Evaluator";
518        myES.OperatorGraph.RemoveOperator(Evaluator.Guid);
519        myES.OperatorGraph.AddOperator(value);
520        myPopulationInitialization.AddSubOperator(value, 1);
521        myESMain.AddSubOperator(value, 1);
522      }
523    }
524    public IOperator Mutator {
525      get { return myESMain.SubOperators[0]; }
526      set {
527        value.Name = "Mutator";
528        myES.OperatorGraph.RemoveOperator(Mutator.Guid);
529        myES.OperatorGraph.AddOperator(value);
530        myESMain.AddSubOperator(value, 0);
531      }
532    }
533    public IOperator Recombinator {
534      get { return myESMain.SubOperators[2]; }
535      set {
536        value.Name = "Recombinator";
537        myES.OperatorGraph.RemoveOperator(Recombinator.Guid);
538        myES.OperatorGraph.AddOperator(value);
539        myESMain.AddSubOperator(value, 2);
540      }
541    }
542    #endregion
543
544    public ES() {
545      myEngine = new SequentialEngine.SequentialEngine();
546      Create(myEngine);
547      SetReferences();
548    }
549
550    public override IView CreateView() {
551      return new ESEditor(this);
552    }
553    public virtual IEditor CreateEditor() {
554      return new ESEditor(this);
555    }
556
557    public override object Clone(IDictionary<Guid, object> clonedObjects) {
558      ES clone = new ES();
559      clonedObjects.Add(Guid, clone);
560      clone.myEngine = (IEngine)Auxiliary.Clone(Engine, clonedObjects);
561      return clone;
562    }
563
564    #region SetReferences Method
565    private void SetReferences() {
566      // ES
567      CombinedOperator co1 = (CombinedOperator)Engine.OperatorGraph.InitialOperator;
568      myES = co1;
569      // SequentialProcessor in ES
570      SequentialProcessor sp1 = (SequentialProcessor)co1.OperatorGraph.InitialOperator;
571      // Variable Injection
572      CombinedOperator co2 = (CombinedOperator)sp1.SubOperators[0];
573      myVariableInjection = co2;
574      // SequentialProcessor in Variable Injection
575      SequentialProcessor sp2 = (SequentialProcessor)co2.OperatorGraph.InitialOperator;
576      // RandomInjector
577      RandomInjector ri = (RandomInjector)sp2.SubOperators[0];
578      mySetSeedRandomly = ri.GetVariable("SetSeedRandomly").GetValue<BoolData>();
579      mySeed = ri.GetVariable("Seed").GetValue<IntData>();
580      // VariableInjector
581      VariableInjector vi = (VariableInjector)sp2.SubOperators[2];
582      myMu = vi.GetVariable("ESmu").GetValue<IntData>();
583      myRho = vi.GetVariable("ESrho").GetValue<IntData>();
584      myLambda = vi.GetVariable("ESlambda").GetValue<IntData>();
585      myMaximumGenerations = vi.GetVariable("MaximumGenerations").GetValue<IntData>();
586      myPlusNotation = vi.GetVariable("PlusNotation").GetValue<BoolData>();
587      myShakingFactor = vi.GetVariable("ShakingFactor").GetValue<DoubleData>();
588      myTargetSuccessProbability = vi.GetVariable("TargetSuccessProbability").GetValue<DoubleData>();
589      mySuccessProbability = vi.GetVariable("SuccessProbability").GetValue<DoubleData>();
590      myLearningRate = vi.GetVariable("LearningRate").GetValue<DoubleData>();
591      myDampeningFactor = vi.GetVariable("DampeningFactor").GetValue<DoubleData>();
592      myUseSuccessRule = vi.GetVariable("UseSuccessRule").GetValue<BoolData>();
593      // Population Initialization
594      CombinedOperator co3 = (CombinedOperator)sp1.SubOperators[1];
595      myPopulationInitialization = co3;
596      // ES Main
597      CombinedOperator co4 = (CombinedOperator)sp1.SubOperators[2];
598      myESMain = co4;
599    }
600    #endregion
601
602    #region Persistence Methods
603    public override XmlNode GetXmlNode(string name, XmlDocument document, IDictionary<Guid, IStorable> persistedObjects) {
604      XmlNode node = base.GetXmlNode(name, document, persistedObjects);
605      node.AppendChild(PersistenceManager.Persist("Engine", Engine, document, persistedObjects));
606      return node;
607    }
608    public override void Populate(XmlNode node, IDictionary<Guid, IStorable> restoredObjects) {
609      base.Populate(node, restoredObjects);
610      myEngine = (IEngine)PersistenceManager.Restore(node.SelectSingleNode("Engine"), restoredObjects);
611      SetReferences();
612    }
613    #endregion
614  }
615}
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