[16760] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 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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| 22 | using HEAL.Attic;
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| 23 | using HeuristicLab.Common;
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| 24 | using HeuristicLab.Core;
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| 25 | using HeuristicLab.Data;
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| 26 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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| 27 | using HeuristicLab.Parameters;
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| 28 | using HeuristicLab.Problems.DataAnalysis.Symbolic;
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| 29 | using System.Collections.Generic;
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| 30 | using System.Linq;
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| 31 |
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| 32 | namespace HeuristicLab.Algorithms.EvolvmentModelsOfModels {
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| 33 | [Item("EMMMultyPointMutatorNodeTypeSaving", "Selects a random tree node and changes the symbol.")]
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| 34 | [StorableType("8A24C715-BEFD-4396-9264-31F949330B1A")]
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| 35 | public sealed class EMMMultyPointsMutatorNodeTypeSaving : SymbolicExpressionTreeManipulator {
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[16899] | 36 |
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[16760] | 37 | private const string MapParameterName = "Map";
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| 38 | private const string MutationProbabilityParameterName = "MutationProbability";
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[16899] | 39 | public ILookupParameter<EMMMapBase<ISymbolicExpressionTree>> MapParameter {
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| 40 | get { return (ILookupParameter<EMMMapBase<ISymbolicExpressionTree>>)Parameters[MapParameterName]; }
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[16760] | 41 | }
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[16899] | 42 | public List<ISymbolicExpressionTree> ModelSet => MapParameter.ActualValue.ModelSet;
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| 43 | public List<List<int>> Map => MapParameter.ActualValue.Map;
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[16760] | 44 |
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| 45 | public ILookupParameter<PercentValue> MutationProbabilityParameter {
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| 46 | get { return (ILookupParameter<PercentValue>)Parameters[MutationProbabilityParameterName]; }
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| 47 | }
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[16899] | 48 |
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[16760] | 49 | public PercentValue MutationProbability => MutationProbabilityParameter.ActualValue;
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| 50 |
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| 51 | [StorableConstructor]
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| 52 | private EMMMultyPointsMutatorNodeTypeSaving(StorableConstructorFlag _) : base(_) { }
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| 53 | private EMMMultyPointsMutatorNodeTypeSaving(EMMMultyPointsMutatorNodeTypeSaving original, Cloner cloner) : base(original, cloner) { }
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| 54 | public EMMMultyPointsMutatorNodeTypeSaving() : base() {
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[16899] | 55 | Parameters.Add(new LookupParameter<EMMMapBase<ISymbolicExpressionTree>>(MapParameterName));
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[16760] | 56 | Parameters.Add(new LookupParameter<PercentValue>(MutationProbabilityParameterName));
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| 57 | }
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| 58 |
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| 59 | public override IDeepCloneable Clone(Cloner cloner) {
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| 60 | return new EMMMultyPointsMutatorNodeTypeSaving(this, cloner);
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| 61 | }
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| 62 |
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| 63 | protected override void Manipulate(IRandom random, ISymbolicExpressionTree symbolicExpressionTree) {
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[17002] | 64 | EMMOnePointMutatorPart(random, symbolicExpressionTree, ModelSet, Map, MutationProbability);
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[16760] | 65 | }
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| 66 | private static bool SymbolTypeCheck(ISymbol nSymbol, IEnumerable<ISymbol> allSymbols) {
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| 67 | foreach (var pSymbol in allSymbols) {
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| 68 | if (nSymbol == pSymbol)
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| 69 | return true;
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| 70 | }
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| 71 | return false;
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| 72 | }
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[17002] | 73 | public void EMMOnePointMutatorPart(IRandom random, ISymbolicExpressionTree symbolicExpressionTree, List<ISymbolicExpressionTree> modelSet, List<List<int>> map, PercentValue mutationProbability) {
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[16760] | 74 |
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| 75 | List<ISymbol> allowedSymbols = new List<ISymbol>();
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| 76 | var probability = (1 / mutationProbability.Value) / (symbolicExpressionTree.Length); // probability for edch node to mutate
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| 77 | var allAllowedSymbols = symbolicExpressionTree.Root.Grammar.AllowedSymbols.Where(s =>
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| 78 | !(s is Defun) &&
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| 79 | !(s is GroupSymbol) &&
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| 80 | !(s is ProgramRootSymbol) &&
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| 81 | !(s is StartSymbol)
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| 82 | );
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| 83 |
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| 84 | symbolicExpressionTree.Root.ForEachNodePostfix(node => {//for each node in tree - try to mutate
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| 85 |
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| 86 | if (SymbolTypeCheck(node.Symbol, allAllowedSymbols)) { // we do not want to toch StartSymbol
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| 87 | if (random.NextDouble() < probability) { // ok. this node decide to mutate
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| 88 | if (node.Symbol.MaximumArity > 0) {
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| 89 | foreach (var symbol in allAllowedSymbols) {// add in list all nodes with the same arity
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| 90 | if ((symbol.MaximumArity == node.Symbol.MaximumArity) && (symbol.MinimumArity == node.Symbol.MinimumArity)) { allowedSymbols.Add(symbol); }
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| 91 | }
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| 92 | } else { // for terminal nodes add the same type of nodes
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| 93 | allowedSymbols.Add(node.Symbol);
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| 94 | }
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[17002] | 95 | int pTemp = random.Next(modelSet.Count);
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| 96 | if (node is TreeModelTreeNode treeNode) { pTemp = treeNode.TreeNumber; } //remeber the cluster number
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[16760] | 97 | var weights = allowedSymbols.Select(s => s.InitialFrequency).ToList(); // set up probabilities
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| 98 |
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| 99 | #pragma warning disable CS0618 // Type or member is obsolete
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| 100 | var newSymbol = allowedSymbols.SelectRandom(weights, random); // create new node from the choosen symbol type. Ror terminal nodes it means that we have only one possible varint.
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| 101 | #pragma warning restore CS0618 // Type or member is obsolete
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| 102 | node = newSymbol.CreateTreeNode();
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| 103 |
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| 104 | if (node is TreeModelTreeNode treeNode2) { // make rigth mutation for tree model
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[17002] | 105 | treeNode2.TreeNumber = pTemp;
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| 106 | MapParameter.ActualValue.NodeForMutationChange(random, treeNode2);
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[16760] | 107 | } else if (node.HasLocalParameters) { // make local parametrs set up for other node types
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| 108 | node.ResetLocalParameters(random);
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| 109 | }
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| 110 | allowedSymbols.Clear(); // clean before the next node
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| 111 | }
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| 112 |
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| 113 | }
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| 114 | });
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| 115 | }
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| 116 | }
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| 117 | } |
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