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source: branches/3136_Structural_GP/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Symbols/NumberTreeNode.cs @ 18146

Last change on this file since 18146 was 18146, checked in by mkommend, 2 years ago

#3136: Merged trunk changes into branch.

File size: 2.7 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.Encodings.SymbolicExpressionTreeEncoding;
25using HEAL.Attic;
26using HeuristicLab.Random;
27namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
28  [StorableType("247DBD04-18F2-4184-B6F5-6E283BF06FD0")]
29  public sealed class NumberTreeNode : SymbolicExpressionTreeTerminalNode, INumericTreeNode {
30    public new Number Symbol => (Number)base.Symbol;
31
32    [Storable]
33    public double Value { get; set; }
34
35    [StorableConstructor]
36    private NumberTreeNode(StorableConstructorFlag _) : base(_) { }
37
38    private NumberTreeNode(NumberTreeNode original, Cloner cloner)
39      : base(original, cloner) {
40      Value = original.Value;
41    }
42
43    private NumberTreeNode() : base() { }
44    public NumberTreeNode(Number numberSymbol) : base(numberSymbol) { }
45
46    public override bool HasLocalParameters => true;
47
48    public override void ResetLocalParameters(IRandom random) {
49      base.ResetLocalParameters(random);
50      var range = Symbol.MaxValue - Symbol.MinValue;
51      Value = random.NextDouble() * range + Symbol.MinValue;
52    }
53
54    public override void ShakeLocalParameters(IRandom random, double shakingFactor) {
55      base.ShakeLocalParameters(random, shakingFactor);
56      // 50% additive & 50% multiplicative
57      if (random.NextDouble() < 0.5) {
58        var x = NormalDistributedRandom.NextDouble(random, Symbol.ManipulatorMu, Symbol.ManipulatorSigma);
59        Value = Value + x * shakingFactor;
60      } else {
61        var x = NormalDistributedRandom.NextDouble(random, 1.0, Symbol.MultiplicativeManipulatorSigma);
62        Value = Value * x;
63      }
64    }
65
66    public override IDeepCloneable Clone(Cloner cloner) {
67      return new NumberTreeNode(this, cloner);
68    }
69
70    public override string ToString() {
71      return $"{Value:E4}";
72    }
73  }
74}
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