source: branches/HeuristicLab.LinqExpressionTreeInterpreter/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Symbols/FunctionSymbol.cs @ 12807

Last change on this file since 12807 was 12807, checked in by bburlacu, 6 years ago

#2442: Added new interpreter as described above. The new function symbol accepts lambdas in the constructor and gets intitialized with a fixed arity. The MethodInfo of the provided lambda is stored internally and used by the interpreter. The MethodInfo field should be [Storable] but this would require a small change to the serializer (relatively trivial I think). Currently it works with the programmable problem and the SymbolicExpressionTreeEncoding (see attached example).

File size: 3.1 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 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.Reflection;
24using HeuristicLab.Common;
25using HeuristicLab.Core;
26using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
29  [StorableClass]
30  [Item("FunctionSymbol", "Symbol that wraps a user-defined binary operation.")]
31  public sealed class FunctionSymbol : Symbol {
32    private int minimumArity = 2;
33    private int maximumArity = 2;
34
35    public override int MinimumArity {
36      get { return minimumArity; }
37    }
38    public override int MaximumArity {
39      get { return maximumArity; }
40    }
41
42    //[Storable]
43    private MethodInfo methodInfo;
44    public MethodInfo MethodInfo {
45      get { return methodInfo; }
46      private set { methodInfo = value; }
47    }
48
49    [StorableConstructor]
50    private FunctionSymbol(bool deserializing) : base(deserializing) { }
51
52    private FunctionSymbol(FunctionSymbol original, Cloner cloner) : base(original, cloner) {
53      this.MethodInfo = original.MethodInfo; // symbols are cached so we also cache the MethodInfo in order to optimize the performance of the interpreter
54    }
55    public override IDeepCloneable Clone(Cloner cloner) {
56      return new FunctionSymbol(this, cloner);
57    }
58
59    public FunctionSymbol(string name, Func<double, double> f) : base(name, "Symbol that wraps a user-defined unary operation.") {
60      MethodInfo = f.GetMethodInfo();
61      minimumArity = maximumArity = 1;
62    }
63
64    public FunctionSymbol(string name, Func<double, double, double> f) : base(name, "Symbol that wraps a user-defined binary operation.") {
65      MethodInfo = f.GetMethodInfo();
66      minimumArity = maximumArity = 2;
67    }
68
69    public FunctionSymbol(string name, Func<double, double, double, double> f) : base(name, "Symbol that wraps a user-defined tertiary operation.") {
70      MethodInfo = f.GetMethodInfo();
71      minimumArity = maximumArity = 3;
72    }
73
74    public FunctionSymbol(string name, Func<double, double, double, double, double> f) : base(name, "Symbol that wraps a user-defined quaternary operation.") {
75      MethodInfo = f.GetMethodInfo();
76      minimumArity = maximumArity = 4;
77    }
78  }
79}
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