[3253] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[15583] | 3 | * Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[3253] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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[4722] | 22 | using HeuristicLab.Common;
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[4068] | 23 | using HeuristicLab.Core;
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[3253] | 24 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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| 25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[3269] | 26 | using HeuristicLab.Random;
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[5532] | 27 | namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
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[3253] | 28 | [StorableClass]
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[3258] | 29 | public sealed class ConstantTreeNode : SymbolicExpressionTreeTerminalNode {
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[3269] | 30 | public new Constant Symbol {
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| 31 | get { return (Constant)base.Symbol; }
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| 32 | }
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[3253] | 33 |
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| 34 | private double constantValue;
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| 35 | [Storable]
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| 36 | public double Value {
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| 37 | get { return constantValue; }
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| 38 | set { constantValue = value; }
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| 39 | }
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[3485] | 40 |
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[4722] | 41 | [StorableConstructor]
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| 42 | private ConstantTreeNode(bool deserializing) : base(deserializing) { }
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[3485] | 43 |
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[4722] | 44 | private ConstantTreeNode(ConstantTreeNode original, Cloner cloner)
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| 45 | : base(original, cloner) {
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[3253] | 46 | constantValue = original.constantValue;
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| 47 | }
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| 48 |
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[4722] | 49 | private ConstantTreeNode() : base() { }
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[3253] | 50 | public ConstantTreeNode(Constant constantSymbol) : base(constantSymbol) { }
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| 51 |
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[3442] | 52 | public override bool HasLocalParameters {
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| 53 | get {
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| 54 | return true;
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| 55 | }
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| 56 | }
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[3269] | 57 | public override void ResetLocalParameters(IRandom random) {
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| 58 | base.ResetLocalParameters(random);
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[3465] | 59 | var range = Symbol.MaxValue - Symbol.MinValue;
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[6180] | 60 | Value = random.NextDouble() * range + Symbol.MinValue;
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[3269] | 61 | }
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| 62 |
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[3512] | 63 | public override void ShakeLocalParameters(IRandom random, double shakingFactor) {
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| 64 | base.ShakeLocalParameters(random, shakingFactor);
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[5326] | 65 | // 50% additive & 50% multiplicative
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| 66 | if (random.NextDouble() < 0.5) {
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| 67 | double x = NormalDistributedRandom.NextDouble(random, Symbol.ManipulatorMu, Symbol.ManipulatorSigma);
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| 68 | Value = Value + x * shakingFactor;
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| 69 | } else {
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| 70 | double x = NormalDistributedRandom.NextDouble(random, 1.0, Symbol.MultiplicativeManipulatorSigma);
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| 71 | Value = Value * x;
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| 72 | }
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[3512] | 73 | }
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| 74 |
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[4722] | 75 | public override IDeepCloneable Clone(Cloner cloner) {
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| 76 | return new ConstantTreeNode(this, cloner);
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[3253] | 77 | }
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[3442] | 78 |
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| 79 | public override string ToString() {
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[3465] | 80 | return constantValue.ToString("E4");
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[3442] | 81 | }
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[3253] | 82 | }
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| 83 | }
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