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source: trunk/sources/HeuristicLab.Problems.ExternalEvaluation.GP/3.3/Grammar/FullFunctionalExpressionGrammar.cs @ 4364

Last change on this file since 4364 was 4364, checked in by abeham, 12 years ago

#1179

  • Added program root symbol
File size: 4.2 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.Core;
25using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
26using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Symbols;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28
29namespace HeuristicLab.Problems.ExternalEvaluation.GP {
30  [StorableClass]
31  [Item("FullFunctionalExpressionGrammar", "Represents a grammar for functional expressions using all available functions.")]
32  public class FullFunctionalExpressionGrammar : DefaultSymbolicExpressionGrammar {
33    [Storable]
34    private HeuristicLab.Problems.ExternalEvaluation.GP.Variable variableSymbol;
35
36    public FullFunctionalExpressionGrammar()
37      : base() {
38      Initialize();
39    }
40
41    private void Initialize() {
42      var originalStart = StartSymbol;
43      if (!(originalStart is ProgramRootSymbol)) {
44        var root = new ProgramRootSymbol();
45        AddSymbol(root);
46        SetMinSubtreeCount(root, 1);
47        SetMaxSubtreeCount(root, 1);
48        SetAllowedChild(root, originalStart, 0);
49
50        StartSymbol = root;
51      }
52
53      var add = new Addition();
54      var sub = new Subtraction();
55      var mul = new Multiplication();
56      var div = new Division();
57      var mean = new Average();
58      var sin = new Sine();
59      var cos = new Cosine();
60      var tan = new Tangent();
61      var log = new Logarithm();
62      var exp = new Exponential();
63      var @if = new IfThenElse();
64      var gt = new GreaterThan();
65      var lt = new LessThan();
66      var and = new And();
67      var or = new Or();
68      var not = new Not();
69      var constant = new Constant();
70      constant.MinValue = -20;
71      constant.MaxValue = 20;
72      variableSymbol = new Variable();
73
74      var allSymbols = new List<Symbol>() { add, sub, mul, div, mean, sin, cos, tan, log, exp, @if, gt, lt, and, or, not, constant, variableSymbol };
75      var unaryFunctionSymbols = new List<Symbol>() { sin, cos, tan, log, exp, not };
76      var binaryFunctionSymbols = new List<Symbol>() { gt, lt };
77      var functionSymbols = new List<Symbol>() { add, sub, mul, div, mean, and, or};
78
79      foreach (var symb in allSymbols)
80        AddSymbol(symb);
81
82      foreach (var funSymb in functionSymbols) {
83        SetMinSubtreeCount(funSymb, 1);
84        SetMaxSubtreeCount(funSymb, 3);
85      }
86      foreach (var funSymb in unaryFunctionSymbols) {
87        SetMinSubtreeCount(funSymb, 1);
88        SetMaxSubtreeCount(funSymb, 1);
89      }
90      foreach (var funSymb in binaryFunctionSymbols) {
91        SetMinSubtreeCount(funSymb, 2);
92        SetMaxSubtreeCount(funSymb, 2);
93      }
94
95      SetMinSubtreeCount(@if, 3);
96      SetMaxSubtreeCount(@if, 3);
97      SetMinSubtreeCount(constant, 0);
98      SetMaxSubtreeCount(constant, 0);
99      SetMinSubtreeCount(variableSymbol, 0);
100      SetMaxSubtreeCount(variableSymbol, 0);
101
102      // allow each symbol as child of the start symbol
103      foreach (var symb in allSymbols) {
104        SetAllowedChild(originalStart, symb, 0);
105      }
106
107      // allow each symbol as child of every other symbol (except for terminals that have maxSubtreeCount == 0)
108      foreach (var parent in allSymbols) {
109        for (int i = 0; i < GetMaxSubtreeCount(parent); i++)
110          foreach (var child in allSymbols) {
111            SetAllowedChild(parent, child, i);
112          }
113      }
114    }
115  }
116}
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