source: trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Creators/MultiSymbolicDataAnalysisExpressionCreator.cs @ 18064

Last change on this file since 18064 was 18064, checked in by mkommend, 8 weeks ago

#2997: Simplified tree creator interface and removed cloning of grammars,

File size: 7.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 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.Linq;
25using HeuristicLab.Collections;
26using HeuristicLab.Common;
27using HeuristicLab.Core;
28using HeuristicLab.Data;
29using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
30using HeuristicLab.Operators;
31using HeuristicLab.Optimization;
32using HeuristicLab.Parameters;
33using HEAL.Attic;
34using HeuristicLab.PluginInfrastructure;
35
36namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Creators {
37  [StorableType("8E932C08-6D00-4055-9525-DBF28420DAB0")]
38  public class MultiSymbolicDataAnalysisExpressionCreator : StochasticMultiBranch<ISymbolicDataAnalysisSolutionCreator>,
39    ISymbolicDataAnalysisSolutionCreator,
40    ISymbolicExpressionTreeSizeConstraintOperator,
41  ISymbolicExpressionTreeGrammarBasedOperator {
42    private const string SymbolicExpressionTreeParameterName = "SymbolicExpressionTree";
43    private const string MaximumSymbolicExpressionTreeLengthParameterName = "MaximumSymbolicExpressionTreeLength";
44    private const string MaximumSymbolicExpressionTreeDepthParameterName = "MaximumSymbolicExpressionTreeDepth";
45    private const string SymbolicExpressionTreeGrammarParameterName = "SymbolicExpressionTreeGrammar";
46
47    public override bool CanChangeName {
48      get { return false; }
49    }
50    protected override bool CreateChildOperation {
51      get { return true; }
52    }
53
54    #region parameter properties
55    public ILookupParameter<ISymbolicExpressionTree> SymbolicExpressionTreeParameter {
56      get { return (ILookupParameter<ISymbolicExpressionTree>)Parameters[SymbolicExpressionTreeParameterName]; }
57    }
58    public IValueLookupParameter<IntValue> MaximumSymbolicExpressionTreeLengthParameter {
59      get { return (IValueLookupParameter<IntValue>)Parameters[MaximumSymbolicExpressionTreeLengthParameterName]; }
60    }
61    public IValueLookupParameter<IntValue> MaximumSymbolicExpressionTreeDepthParameter {
62      get { return (IValueLookupParameter<IntValue>)Parameters[MaximumSymbolicExpressionTreeDepthParameterName]; }
63    }
64    public IValueLookupParameter<ISymbolicExpressionGrammar> SymbolicExpressionTreeGrammarParameter {
65      get { return (IValueLookupParameter<ISymbolicExpressionGrammar>)Parameters[SymbolicExpressionTreeGrammarParameterName]; }
66    }
67    #endregion
68
69    [StorableConstructor]
70    protected MultiSymbolicDataAnalysisExpressionCreator(StorableConstructorFlag _) : base(_) { }
71    protected MultiSymbolicDataAnalysisExpressionCreator(MultiSymbolicDataAnalysisExpressionCreator original, Cloner cloner) : base(original, cloner) { }
72    public override IDeepCloneable Clone(Cloner cloner) { return new MultiSymbolicDataAnalysisExpressionCreator(this, cloner); }
73    public MultiSymbolicDataAnalysisExpressionCreator()
74      : base() {
75      Parameters.Add(new LookupParameter<ISymbolicExpressionTree>(SymbolicExpressionTreeParameterName, "The symbolic expression tree on which the operator should be applied."));
76      Parameters.Add(new ValueLookupParameter<IntValue>(MaximumSymbolicExpressionTreeLengthParameterName, "The maximal length (number of nodes) of the symbolic expression tree."));
77      Parameters.Add(new ValueLookupParameter<IntValue>(MaximumSymbolicExpressionTreeDepthParameterName, "The maximal depth of the symbolic expression tree (a tree with one node has depth = 0)."));
78      Parameters.Add(new ValueLookupParameter<ISymbolicExpressionGrammar>(SymbolicExpressionTreeGrammarParameterName, "The tree grammar that defines the correct syntax of symbolic expression trees that should be created."));     
79
80      List<ISymbolicDataAnalysisSolutionCreator> list = new List<ISymbolicDataAnalysisSolutionCreator>();
81      foreach (Type type in ApplicationManager.Manager.GetTypes(typeof(ISymbolicDataAnalysisSolutionCreator))) {
82        if (this.GetType().Assembly != type.Assembly) continue;
83        if (typeof(IMultiOperator<ISymbolicDataAnalysisSolutionCreator>).IsAssignableFrom(type)) continue;
84        list.Add((ISymbolicDataAnalysisSolutionCreator)Activator.CreateInstance(type));
85      }
86      CheckedItemList<ISymbolicDataAnalysisSolutionCreator> checkedItemList = new CheckedItemList<ISymbolicDataAnalysisSolutionCreator>();
87      checkedItemList.AddRange(list.OrderBy(op => op.Name));
88      Operators = checkedItemList.AsReadOnly();
89      Operators_ItemsAdded(this, new CollectionItemsChangedEventArgs<IndexedItem<ISymbolicDataAnalysisSolutionCreator>>(Operators.CheckedItems));
90
91    }
92
93
94    public ISymbolicExpressionTree CreateTree(IRandom random, ISymbolicExpressionGrammar grammar, int maxTreeLength, int maxTreeDepth) {
95      double sum = Operators.CheckedItems.Sum(o => Probabilities[o.Index]);
96      if (sum.IsAlmost(0)) throw new InvalidOperationException(Name + ": All selected operators have zero probability.");
97      double r = random.NextDouble() * sum;
98      sum = 0;
99      int index = -1;
100      foreach (var indexedItem in Operators.CheckedItems) {
101        sum += Probabilities[indexedItem.Index];
102        if (sum > r) {
103          index = indexedItem.Index;
104          break;
105        }
106      }
107      return Operators[index].CreateTree(random, grammar, maxTreeLength, maxTreeDepth);
108    }
109
110    protected override void Operators_ItemsReplaced(object sender, CollectionItemsChangedEventArgs<IndexedItem<ISymbolicDataAnalysisSolutionCreator>> e) {
111      base.Operators_ItemsReplaced(sender, e);
112      ParameterizeTreeCreators();
113    }
114
115    protected override void Operators_ItemsAdded(object sender, CollectionItemsChangedEventArgs<IndexedItem<ISymbolicDataAnalysisSolutionCreator>> e) {
116      base.Operators_ItemsAdded(sender, e);
117      ParameterizeTreeCreators();
118    }
119    private void ParameterizeTreeCreators() {
120      foreach (IStochasticOperator creator in Operators.OfType<IStochasticOperator>()) {
121        creator.RandomParameter.ActualName = RandomParameter.Name;
122      }
123      foreach (ISymbolicExpressionTreeCreator creator in Operators.OfType<ISymbolicExpressionTreeCreator>()) {
124        creator.SymbolicExpressionTreeParameter.ActualName = SymbolicExpressionTreeParameter.Name;
125      }
126      foreach (ISymbolicExpressionTreeSizeConstraintOperator creator in Operators.OfType<ISymbolicExpressionTreeSizeConstraintOperator>()) {
127        creator.MaximumSymbolicExpressionTreeDepthParameter.ActualName = MaximumSymbolicExpressionTreeDepthParameter.Name;
128        creator.MaximumSymbolicExpressionTreeLengthParameter.ActualName = MaximumSymbolicExpressionTreeLengthParameter.Name;
129      }
130
131      foreach (ISymbolicExpressionTreeGrammarBasedOperator creator in Operators.OfType<ISymbolicExpressionTreeGrammarBasedOperator>()) {
132        creator.SymbolicExpressionTreeGrammarParameter.ActualName = SymbolicExpressionTreeGrammarParameter.Name;
133      }
134    }
135
136  }
137}
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