Free cookie consent management tool by TermsFeed Policy Generator

source: branches/HeuristicLab.EvolutionaryTracking/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Manipulators/OnePointShaker.cs @ 7514

Last change on this file since 7514 was 7514, checked in by bburlacu, 12 years ago

#1772: Merged latest trunk changes to SymbolicExpressionTreeEncoding. Deleted unneeded obj folder.

File size: 2.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 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.Linq;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Data;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27using HeuristicLab.Parameters;
28using System.Collections.Generic;
29
30namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
31  [StorableClass]
32  [Item("OnePointShaker", "Selects a random node with local parameters and manipulates the selected node.")]
33  public sealed class OnePointShaker : TracingSymbolicExpressionTreeManipulator {
34    private const string ShakingFactorParameterName = "ShakingFactor";
35    #region parameter properties
36    public IValueParameter<DoubleValue> ShakingFactorParameter {
37      get { return (IValueParameter<DoubleValue>)Parameters[ShakingFactorParameterName]; }
38    }
39    #endregion
40    #region properties
41    public double ShakingFactor {
42      get { return ShakingFactorParameter.Value.Value; }
43      set { ShakingFactorParameter.Value.Value = value; }
44    }
45    #endregion
46    [StorableConstructor]
47    private OnePointShaker(bool deserializing) : base(deserializing) { }
48    private OnePointShaker(OnePointShaker original, Cloner cloner) : base(original, cloner) { }
49    public OnePointShaker()
50      : base() {
51      Parameters.Add(new FixedValueParameter<DoubleValue>(ShakingFactorParameterName, "The shaking factor that should be used for the manipulation of constants (default=1.0).", new DoubleValue(1.0)));
52    }
53
54    public override IDeepCloneable Clone(Cloner cloner) {
55      return new OnePointShaker(this, cloner);
56    }
57
58    protected override void Manipulate(IRandom random, ISymbolicExpressionTree tree) {
59      List<ISymbolicExpressionTreeNode> parametricNodes = new List<ISymbolicExpressionTreeNode>();
60      tree.Root.ForEachNodePostfix(n => {
61        if (n.HasLocalParameters) parametricNodes.Add(n);
62      });
63      if (parametricNodes.Count > 0) {
64        var selectedPoint = parametricNodes.SelectRandom(random);
65        selectedPoint.ShakeLocalParameters(random, ShakingFactor);
66      }
67    }
68  }
69}
Note: See TracBrowser for help on using the repository browser.