source: trunk/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Creators/SymbolicExpressionTreeCreator.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: 4.0 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Data;
25using HeuristicLab.Parameters;
26using HEAL.Attic;
27
28namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
29  /// <summary>
30  /// A base class for operators creating symbolic expression trees.
31  /// </summary>
32  [Item("SymbolicExpressionTreeCreator", "A base class for operators creating symbolic expression trees.")]
33  [StorableType("88CC0F00-5674-4598-A3C4-756B3B7E80CB")]
34  public abstract class SymbolicExpressionTreeCreator : SymbolicExpressionTreeOperator, ISymbolicExpressionTreeCreator {
35    private const string MaximumSymbolicExpressionTreeLengthParameterName = "MaximumSymbolicExpressionTreeLength";
36    private const string MaximumSymbolicExpressionTreeDepthParameterName = "MaximumSymbolicExpressionTreeDepth";
37
38    private const string SymbolicExpressionTreeGrammarParameterName = "SymbolicExpressionTreeGrammar";
39
40    #region Parameter Properties
41    public IValueLookupParameter<IntValue> MaximumSymbolicExpressionTreeLengthParameter {
42      get { return (IValueLookupParameter<IntValue>)Parameters[MaximumSymbolicExpressionTreeLengthParameterName]; }
43    }
44    public IValueLookupParameter<IntValue> MaximumSymbolicExpressionTreeDepthParameter {
45      get { return (IValueLookupParameter<IntValue>)Parameters[MaximumSymbolicExpressionTreeDepthParameterName]; }
46    }
47    public IValueLookupParameter<ISymbolicExpressionGrammar> SymbolicExpressionTreeGrammarParameter {
48      get { return (IValueLookupParameter<ISymbolicExpressionGrammar>)Parameters[SymbolicExpressionTreeGrammarParameterName]; }
49    }
50    #endregion
51
52    [StorableConstructor]
53    protected SymbolicExpressionTreeCreator(StorableConstructorFlag _) : base(_) { }
54    protected SymbolicExpressionTreeCreator(SymbolicExpressionTreeCreator original, Cloner cloner) : base(original, cloner) { }
55    protected SymbolicExpressionTreeCreator()
56      : base() {
57      Parameters.Add(new ValueLookupParameter<IntValue>(MaximumSymbolicExpressionTreeLengthParameterName, "The maximal length (number of nodes) of the symbolic expression tree."));
58      Parameters.Add(new ValueLookupParameter<IntValue>(MaximumSymbolicExpressionTreeDepthParameterName, "The maximal depth of the symbolic expression tree (a tree with one node has depth = 0)."));
59      Parameters.Add(new ValueLookupParameter<ISymbolicExpressionGrammar>(SymbolicExpressionTreeGrammarParameterName, "The tree grammar that defines the correct syntax of symbolic expression trees that should be created."));
60    }
61
62    public override IOperation InstrumentedApply() {
63      var rand = RandomParameter.ActualValue;
64      var grammar = SymbolicExpressionTreeGrammarParameter.ActualValue;
65      var maxTreeLength = MaximumSymbolicExpressionTreeLengthParameter.ActualValue.Value;
66      var maxTreeDepth = MaximumSymbolicExpressionTreeDepthParameter.ActualValue.Value;
67
68      SymbolicExpressionTreeParameter.ActualValue = CreateTree(rand, grammar, maxTreeLength, maxTreeDepth);
69      return base.InstrumentedApply();
70    }
71    public abstract ISymbolicExpressionTree CreateTree(IRandom random, ISymbolicExpressionGrammar grammar, int maxTreeLength, int maxTreeDepth);
72  }
73}
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