[15765] | 1 | using System;
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| 2 | using System.Collections.Generic;
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[15712] | 3 | using System.Linq;
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| 4 | using System.Threading;
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| 5 | using HeuristicLab.Algorithms.DataAnalysis.SymRegGrammarEnumeration.GrammarEnumeration;
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[15821] | 6 | using HeuristicLab.Collections;
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[15712] | 7 | using HeuristicLab.Common;
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| 8 | using HeuristicLab.Core;
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| 9 | using HeuristicLab.Data;
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| 10 | using HeuristicLab.Optimization;
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[15722] | 11 | using HeuristicLab.Parameters;
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[15712] | 12 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 13 | using HeuristicLab.Problems.DataAnalysis;
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| 14 |
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| 15 | namespace HeuristicLab.Algorithms.DataAnalysis.SymRegGrammarEnumeration {
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| 16 | [Item("Grammar Enumeration Symbolic Regression", "Iterates all possible model structures for a fixed grammar.")]
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| 17 | [StorableClass]
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| 18 | [Creatable(CreatableAttribute.Categories.DataAnalysisRegression, Priority = 250)]
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| 19 | public class GrammarEnumerationAlgorithm : FixedDataAnalysisAlgorithm<IRegressionProblem> {
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[15746] | 20 | #region properties and result names
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[15803] | 21 | private readonly string SearchStructureSizeName = "Search Structure Size";
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| 22 | private readonly string GeneratedPhrasesName = "Generated/Archived Phrases";
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[15746] | 23 | private readonly string GeneratedSentencesName = "Generated Sentences";
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| 24 | private readonly string DistinctSentencesName = "Distinct Sentences";
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| 25 | private readonly string PhraseExpansionsName = "Phrase Expansions";
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[15860] | 26 | private readonly string AverageSentenceComplexityName = "Avg. Sentence Complexity among Distinct";
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[15821] | 27 | private readonly string OverwrittenSentencesName = "Sentences overwritten";
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| 28 | private readonly string AnalyzersParameterName = "Analyzers";
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[15824] | 29 | private readonly string ExpansionsPerSecondName = "Expansions per second";
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[15712] | 30 |
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[15746] | 31 |
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[15861] | 32 | private readonly string OptimizeConstantsParameterName = "Optimize Constants";
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[15910] | 33 | private readonly string ErrorWeightParameterName = "Error Weight";
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[15746] | 34 | private readonly string SearchDataStructureParameterName = "Search Data Structure";
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[15860] | 35 | private readonly string MaxComplexityParameterName = "Max. Complexity";
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[15722] | 36 | private readonly string GuiUpdateIntervalParameterName = "GUI Update Interval";
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[15765] | 37 |
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[15746] | 38 | public override bool SupportsPause { get { return false; } }
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[15712] | 39 |
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[15861] | 40 | protected IValueParameter<BoolValue> OptimizeConstantsParameter {
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| 41 | get { return (IValueParameter<BoolValue>)Parameters[OptimizeConstantsParameterName]; }
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| 42 | }
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| 43 |
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| 44 | public bool OptimizeConstants {
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| 45 | get { return OptimizeConstantsParameter.Value.Value; }
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| 46 | set { OptimizeConstantsParameter.Value.Value = value; }
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| 47 | }
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| 48 |
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[15860] | 49 | protected IValueParameter<IntValue> MaxComplexityParameter {
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| 50 | get { return (IValueParameter<IntValue>)Parameters[MaxComplexityParameterName]; }
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[15712] | 51 | }
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[15860] | 52 | public int MaxComplexity {
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| 53 | get { return MaxComplexityParameter.Value.Value; }
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| 54 | set { MaxComplexityParameter.Value.Value = value; }
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[15722] | 55 | }
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[15712] | 56 |
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[15910] | 57 | protected IValueParameter<DoubleValue> ErrorWeightParameter {
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| 58 | get { return (IValueParameter<DoubleValue>)Parameters[ErrorWeightParameterName]; }
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| 59 | }
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| 60 | public double ErrorWeight {
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| 61 | get { return ErrorWeightParameter.Value.Value; }
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| 62 | set { ErrorWeightParameter.Value.Value = value; }
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| 63 | }
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| 64 |
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[15723] | 65 | protected IValueParameter<IntValue> GuiUpdateIntervalParameter {
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| 66 | get { return (IValueParameter<IntValue>)Parameters[GuiUpdateIntervalParameterName]; }
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[15722] | 67 | }
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| 68 | public int GuiUpdateInterval {
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| 69 | get { return GuiUpdateIntervalParameter.Value.Value; }
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[15723] | 70 | set { GuiUpdateIntervalParameter.Value.Value = value; }
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[15722] | 71 | }
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[15712] | 72 |
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[15746] | 73 | protected IValueParameter<EnumValue<StorageType>> SearchDataStructureParameter {
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| 74 | get { return (IValueParameter<EnumValue<StorageType>>)Parameters[SearchDataStructureParameterName]; }
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[15723] | 75 | }
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[15746] | 76 | public StorageType SearchDataStructure {
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| 77 | get { return SearchDataStructureParameter.Value.Value; }
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| 78 | set { SearchDataStructureParameter.Value.Value = value; }
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[15723] | 79 | }
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| 80 |
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[15821] | 81 | public IFixedValueParameter<ReadOnlyCheckedItemCollection<IGrammarEnumerationAnalyzer>> AnalyzersParameter {
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| 82 | get { return (IFixedValueParameter<ReadOnlyCheckedItemCollection<IGrammarEnumerationAnalyzer>>)Parameters[AnalyzersParameterName]; }
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| 83 | }
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| 84 |
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| 85 | public ICheckedItemCollection<IGrammarEnumerationAnalyzer> Analyzers {
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| 86 | get { return AnalyzersParameter.Value; }
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| 87 | }
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| 88 |
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[15824] | 89 | public SymbolString BestTrainingSentence { get; set; } // Currently set in RSquaredEvaluator: quite hacky, but makes testing much easier for now...
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[15722] | 90 | #endregion
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[15712] | 91 |
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[15860] | 92 | public Dictionary<int, int> DistinctSentencesComplexity { get; private set; } // Semantically distinct sentences and their length in a run.
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[15812] | 93 | public HashSet<int> ArchivedPhrases { get; private set; }
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[15821] | 94 | internal SearchDataStore OpenPhrases { get; private set; } // Stack/Queue/etc. for fetching the next node in the search tree.
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[15812] | 95 |
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[15821] | 96 | #region execution stats
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| 97 | public int AllGeneratedSentencesCount { get; private set; }
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[15746] | 98 |
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[15821] | 99 | public int OverwrittenSentencesCount { get; private set; } // It is not guaranteed that shorter solutions are found first.
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| 100 | // When longer solutions are overwritten with shorter ones,
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| 101 | // this counter is increased.
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| 102 | public int PhraseExpansionCount { get; private set; } // Number, how many times a nonterminal symbol is replaced with a production rule.
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| 103 | #endregion
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| 104 |
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[15800] | 105 | public Grammar Grammar { get; private set; }
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[15712] | 106 |
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[15765] | 107 |
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[15722] | 108 | #region ctors
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| 109 | public override IDeepCloneable Clone(Cloner cloner) {
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| 110 | return new GrammarEnumerationAlgorithm(this, cloner);
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| 111 | }
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[15712] | 112 |
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[15722] | 113 | public GrammarEnumerationAlgorithm() {
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[15723] | 114 | Problem = new RegressionProblem() {
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[15910] | 115 | ProblemData = new HeuristicLab.Problems.Instances.DataAnalysis.PolyTen(seed: 1234).GenerateRegressionData()
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[15723] | 116 | };
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| 117 |
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[15910] | 118 | Parameters.Add(new ValueParameter<BoolValue>(OptimizeConstantsParameterName, "Run constant optimization in sentence evaluation.", new BoolValue(false)));
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| 119 | Parameters.Add(new ValueParameter<DoubleValue>(ErrorWeightParameterName, "Defines, how much weight is put on a phrase's r² value when priorizing phrases during search.", new DoubleValue(0.8)));
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| 120 | Parameters.Add(new ValueParameter<IntValue>(MaxComplexityParameterName, "The maximum number of variable symbols in a sentence.", new IntValue(12)));
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| 121 | Parameters.Add(new ValueParameter<IntValue>(GuiUpdateIntervalParameterName, "Number of generated sentences, until GUI is refreshed.", new IntValue(5000)));
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| 122 | Parameters.Add(new ValueParameter<EnumValue<StorageType>>(SearchDataStructureParameterName, new EnumValue<StorageType>(StorageType.PriorityQueue)));
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[15821] | 123 |
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| 124 | var availableAnalyzers = new IGrammarEnumerationAnalyzer[] {
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| 125 | new SearchGraphVisualizer(),
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[15824] | 126 | new SentenceLogger(),
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| 127 | new RSquaredEvaluator()
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[15821] | 128 | };
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| 129 | Parameters.Add(new FixedValueParameter<ReadOnlyCheckedItemCollection<IGrammarEnumerationAnalyzer>>(
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| 130 | AnalyzersParameterName,
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| 131 | new CheckedItemCollection<IGrammarEnumerationAnalyzer>(availableAnalyzers).AsReadOnly()));
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| 132 |
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| 133 | foreach (var analyzer in Analyzers) {
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| 134 | Analyzers.SetItemCheckedState(analyzer, false);
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| 135 | }
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[15824] | 136 | Analyzers.SetItemCheckedState(Analyzers.First(analyzer => analyzer is RSquaredEvaluator), true);
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[15910] | 137 | //Analyzers.SetItemCheckedState(Analyzers.First(analyzer => analyzer is SentenceLogger), true);
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[15722] | 138 | }
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[15712] | 139 |
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[15910] | 140 | public GrammarEnumerationAlgorithm(GrammarEnumerationAlgorithm original, Cloner cloner) : base(original, cloner) {
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| 141 |
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| 142 |
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| 143 | }
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[15722] | 144 | #endregion
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[15712] | 145 |
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[15722] | 146 | protected override void Run(CancellationToken cancellationToken) {
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[15746] | 147 | #region init
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| 148 | InitResults();
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[15723] | 149 |
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[15910] | 150 | foreach (IGrammarEnumerationAnalyzer grammarEnumerationAnalyzer in Analyzers) {
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| 151 | if (Analyzers.ItemChecked(grammarEnumerationAnalyzer)) {
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| 152 | grammarEnumerationAnalyzer.Register(this);
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| 153 | } else {
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| 154 | grammarEnumerationAnalyzer.Deregister(this);
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| 155 | }
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| 156 | }
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| 157 |
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[15861] | 158 | Analyzers.OfType<RSquaredEvaluator>().First().OptimizeConstants = OptimizeConstants;
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| 159 |
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[15812] | 160 | ArchivedPhrases = new HashSet<int>();
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| 161 |
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[15860] | 162 | DistinctSentencesComplexity = new Dictionary<int, int>();
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[15821] | 163 | AllGeneratedSentencesCount = 0;
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| 164 | OverwrittenSentencesCount = 0;
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| 165 | PhraseExpansionCount = 0;
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[15746] | 166 |
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[15724] | 167 | Grammar = new Grammar(Problem.ProblemData.AllowedInputVariables.ToArray());
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[15712] | 168 |
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[15746] | 169 | OpenPhrases = new SearchDataStore(SearchDataStructure); // Select search strategy
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[15734] | 170 | var phrase0 = new SymbolString(new[] { Grammar.StartSymbol });
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[15832] | 171 | var phrase0Hash = Grammar.Hasher.CalcHashCode(phrase0);
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[15746] | 172 | #endregion
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[15712] | 173 |
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[15910] | 174 | int maxSentenceLength = GetMaxSentenceLength();
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| 175 |
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[15915] | 176 | OpenPhrases.Store(new SearchNode(phrase0Hash, 0.0, 0.0, phrase0));
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[15821] | 177 | while (OpenPhrases.Count > 0) {
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| 178 | if (cancellationToken.IsCancellationRequested) break;
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[15746] | 179 |
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[15915] | 180 | SearchNode fetchedSearchNode = OpenPhrases.GetNext();
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| 181 | SymbolString currPhrase = fetchedSearchNode.SymbolString;
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[15722] | 182 |
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[15915] | 183 | OnPhraseFetched(fetchedSearchNode.Hash, currPhrase);
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[15765] | 184 |
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[15915] | 185 | ArchivedPhrases.Add(fetchedSearchNode.Hash);
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[15726] | 186 |
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[15821] | 187 | // expand next nonterminal symbols
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[15827] | 188 | int nonterminalSymbolIndex = currPhrase.NextNonterminalIndex();
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| 189 | NonterminalSymbol expandedSymbol = (NonterminalSymbol)currPhrase[nonterminalSymbolIndex];
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[15834] | 190 | var appliedProductions = Grammar.Productions[expandedSymbol];
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[15734] | 191 |
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[15827] | 192 | for (int i = 0; i < appliedProductions.Count; i++) {
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[15821] | 193 | PhraseExpansionCount++;
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[15734] | 194 |
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[15827] | 195 | SymbolString newPhrase = currPhrase.DerivePhrase(nonterminalSymbolIndex, appliedProductions[i]);
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[15860] | 196 | int newPhraseComplexity = Grammar.GetComplexity(newPhrase);
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[15712] | 197 |
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[15860] | 198 | if (newPhraseComplexity <= MaxComplexity) {
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[15832] | 199 | var phraseHash = Grammar.Hasher.CalcHashCode(newPhrase);
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[15765] | 200 |
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[15915] | 201 | OnPhraseDerived(fetchedSearchNode.Hash, fetchedSearchNode.SymbolString, phraseHash, newPhrase, expandedSymbol, appliedProductions[i]);
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[15800] | 202 |
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[15821] | 203 | if (newPhrase.IsSentence()) {
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| 204 | AllGeneratedSentencesCount++;
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| 205 |
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[15915] | 206 | OnSentenceGenerated(fetchedSearchNode.Hash, fetchedSearchNode.SymbolString, phraseHash, newPhrase, expandedSymbol, appliedProductions[i]);
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[15821] | 207 |
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[15883] | 208 | // Is the best solution found? (only if RSquaredEvaluator is activated)
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[15907] | 209 | if (Results.ContainsKey(RSquaredEvaluator.BestTrainingQualityResultName)) {
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| 210 | double r2 = ((DoubleValue)Results[RSquaredEvaluator.BestTrainingQualityResultName].Value).Value;
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| 211 | if (r2.IsAlmost(1.0)) {
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| 212 | UpdateView(force: true);
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| 213 | return;
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| 214 | }
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[15883] | 215 | }
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| 216 |
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[15860] | 217 | if (!DistinctSentencesComplexity.ContainsKey(phraseHash) || DistinctSentencesComplexity[phraseHash] > newPhraseComplexity) {
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| 218 | if (DistinctSentencesComplexity.ContainsKey(phraseHash)) OverwrittenSentencesCount++; // for analysis only
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[15821] | 219 |
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[15860] | 220 | DistinctSentencesComplexity[phraseHash] = newPhraseComplexity;
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[15915] | 221 | OnDistinctSentenceGenerated(fetchedSearchNode.Hash, fetchedSearchNode.SymbolString, phraseHash, newPhrase, expandedSymbol, appliedProductions[i]);
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[15746] | 222 | }
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[15821] | 223 | UpdateView();
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| 224 |
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| 225 | } else if (!OpenPhrases.Contains(phraseHash) && !ArchivedPhrases.Contains(phraseHash)) {
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[15915] | 226 |
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| 227 | double r2 = GetR2(newPhrase, fetchedSearchNode.R2);
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| 228 | double phrasePriority = GetPriority(newPhrase, r2, maxSentenceLength);
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| 229 |
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| 230 | SearchNode newSearchNode = new SearchNode(phraseHash, phrasePriority, r2, newPhrase);
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| 231 | OpenPhrases.Store(newSearchNode);
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[15712] | 232 | }
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| 233 | }
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| 234 | }
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| 235 | }
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[15812] | 236 | UpdateView(force: true);
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[15746] | 237 | }
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[15723] | 238 |
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[15915] | 239 | protected double GetPriority(SymbolString phrase, double r2, int maxSentenceLength) {
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[15910] | 240 | double relLength = (double)phrase.Count() / maxSentenceLength;
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[15907] | 241 | double error = 1.0 - r2;
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| 242 |
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[15910] | 243 | return relLength + ErrorWeight * error;
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| 244 | }
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| 245 |
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[15915] | 246 | private double GetR2(SymbolString phrase, double parentR2) {
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| 247 | int length = phrase.Count();
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| 248 |
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| 249 | // If the only nonterminal symbol is Expr, we can need to evaluate the sentence. Otherwise
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| 250 | // the phrase has the same r2 as its parent, from which it was derived.
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| 251 | for (int i = 0; i < length; i++) {
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| 252 | if (phrase[i] is NonterminalSymbol && phrase[i] != Grammar.Expr) {
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| 253 | return parentR2;
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| 254 | }
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| 255 | }
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| 256 |
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| 257 | return Grammar.EvaluatePhrase(phrase, Problem.ProblemData, OptimizeConstants);
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| 258 | }
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| 259 |
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[15910] | 260 | private int GetMaxSentenceLength() {
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| 261 | SymbolString s = new SymbolString(Grammar.StartSymbol);
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| 262 |
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| 263 | while (Grammar.GetComplexity(s) <= MaxComplexity) {
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| 264 | int expandedSymbolIndex = s.NextNonterminalIndex();
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| 265 | NonterminalSymbol expandedSymbol = (NonterminalSymbol)s[expandedSymbolIndex];
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| 266 |
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| 267 | var productions = Grammar.Productions[expandedSymbol];
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| 268 | var longestProduction = productions // Find production with most terminal symbols to expand as much as possible...
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| 269 | .OrderBy(CountTerminals) // but with lowest complexity/nonterminal count to keep complexity low.
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| 270 | .ThenByDescending(CountNonTerminals)
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| 271 | .First();
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| 272 |
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| 273 | s = s.DerivePhrase(expandedSymbolIndex, longestProduction);
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[15907] | 274 | }
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| 275 |
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[15910] | 276 | return s.Count();
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| 277 | }
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[15907] | 278 |
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[15910] | 279 | private int CountTerminals(Production p) {
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| 280 | return p.Count(s => s is TerminalSymbol);
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[15883] | 281 | }
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| 282 |
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[15910] | 283 | private int CountNonTerminals(Production p) {
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| 284 | return p.Count(s => s is NonterminalSymbol);
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| 285 | }
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| 286 |
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[15821] | 287 | #region Visualization in HL
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[15746] | 288 | // Initialize entries in result set.
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| 289 | private void InitResults() {
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[15803] | 290 | Results.Add(new Result(GeneratedPhrasesName, new IntValue(0)));
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| 291 | Results.Add(new Result(SearchStructureSizeName, new IntValue(0)));
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[15746] | 292 | Results.Add(new Result(GeneratedSentencesName, new IntValue(0)));
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| 293 | Results.Add(new Result(DistinctSentencesName, new IntValue(0)));
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| 294 | Results.Add(new Result(PhraseExpansionsName, new IntValue(0)));
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[15821] | 295 | Results.Add(new Result(OverwrittenSentencesName, new IntValue(0)));
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[15860] | 296 | Results.Add(new Result(AverageSentenceComplexityName, new DoubleValue(1.0)));
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[15824] | 297 | Results.Add(new Result(ExpansionsPerSecondName, "In Thousand expansions per second", new IntValue(0)));
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[15712] | 298 | }
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[15746] | 299 |
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| 300 | // Update the view for intermediate results in an algorithm run.
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| 301 | private int updates;
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[15812] | 302 | private void UpdateView(bool force = false) {
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[15746] | 303 | updates++;
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| 304 |
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[15812] | 305 | if (force || updates % GuiUpdateInterval == 1) {
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[15803] | 306 | ((IntValue)Results[GeneratedPhrasesName].Value).Value = ArchivedPhrases.Count;
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| 307 | ((IntValue)Results[SearchStructureSizeName].Value).Value = OpenPhrases.Count;
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[15821] | 308 | ((IntValue)Results[GeneratedSentencesName].Value).Value = AllGeneratedSentencesCount;
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[15860] | 309 | ((IntValue)Results[DistinctSentencesName].Value).Value = DistinctSentencesComplexity.Count;
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[15821] | 310 | ((IntValue)Results[PhraseExpansionsName].Value).Value = PhraseExpansionCount;
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[15860] | 311 | ((DoubleValue)Results[AverageSentenceComplexityName].Value).Value = DistinctSentencesComplexity.Select(pair => pair.Value).Average();
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[15821] | 312 | ((IntValue)Results[OverwrittenSentencesName].Value).Value = OverwrittenSentencesCount;
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[15824] | 313 | ((IntValue)Results[ExpansionsPerSecondName].Value).Value = (int)((PhraseExpansionCount /
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| 314 | ExecutionTime.TotalSeconds) / 1000.0);
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[15746] | 315 | }
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| 316 | }
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[15821] | 317 | #endregion
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[15746] | 318 |
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[15821] | 319 | #region events
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| 320 | public event EventHandler<PhraseEventArgs> PhraseFetched;
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| 321 | private void OnPhraseFetched(int hash, SymbolString symbolString) {
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| 322 | if (PhraseFetched != null) {
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| 323 | PhraseFetched(this, new PhraseEventArgs(hash, symbolString));
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[15746] | 324 | }
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| 325 | }
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[15812] | 326 |
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[15821] | 327 | public event EventHandler<PhraseAddedEventArgs> PhraseDerived;
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| 328 | private void OnPhraseDerived(int parentHash, SymbolString parentSymbolString, int addedHash, SymbolString addedSymbolString, Symbol expandedSymbol, Production expandedProduction) {
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| 329 | if (PhraseDerived != null) {
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| 330 | PhraseDerived(this, new PhraseAddedEventArgs(parentHash, parentSymbolString, addedHash, addedSymbolString, expandedSymbol, expandedProduction));
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| 331 | }
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[15803] | 332 | }
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[15765] | 333 |
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[15821] | 334 | public event EventHandler<PhraseAddedEventArgs> SentenceGenerated;
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| 335 | private void OnSentenceGenerated(int parentHash, SymbolString parentSymbolString, int addedHash, SymbolString addedSymbolString, Symbol expandedSymbol, Production expandedProduction) {
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| 336 | if (SentenceGenerated != null) {
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| 337 | SentenceGenerated(this, new PhraseAddedEventArgs(parentHash, parentSymbolString, addedHash, addedSymbolString, expandedSymbol, expandedProduction));
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| 338 | }
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| 339 | }
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| 340 |
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| 341 | public event EventHandler<PhraseAddedEventArgs> DistinctSentenceGenerated;
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| 342 | private void OnDistinctSentenceGenerated(int parentHash, SymbolString parentSymbolString, int addedHash, SymbolString addedSymbolString, Symbol expandedSymbol, Production expandedProduction) {
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| 343 | if (DistinctSentenceGenerated != null) {
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| 344 | DistinctSentenceGenerated(this, new PhraseAddedEventArgs(parentHash, parentSymbolString, addedHash, addedSymbolString, expandedSymbol, expandedProduction));
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| 345 | }
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| 346 | }
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| 347 |
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| 348 | #endregion
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| 349 |
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[15712] | 350 | }
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[15821] | 351 |
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| 352 | #region events for analysis
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| 353 |
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| 354 | public class PhraseEventArgs : EventArgs {
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| 355 | public int Hash { get; }
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| 356 |
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| 357 | public SymbolString Phrase { get; }
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| 358 |
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| 359 | public PhraseEventArgs(int hash, SymbolString phrase) {
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| 360 | Hash = hash;
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| 361 | Phrase = phrase;
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| 362 | }
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| 363 | }
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| 364 |
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| 365 | public class PhraseAddedEventArgs : EventArgs {
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| 366 | public int ParentHash { get; }
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| 367 | public int NewHash { get; }
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| 368 |
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| 369 | public SymbolString ParentPhrase { get; }
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| 370 | public SymbolString NewPhrase { get; }
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| 371 |
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| 372 | public Symbol ExpandedSymbol { get; }
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| 373 |
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| 374 | public Production ExpandedProduction { get; }
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| 375 |
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| 376 | public PhraseAddedEventArgs(int parentHash, SymbolString parentPhrase, int newHash, SymbolString newPhrase, Symbol expandedSymbol, Production expandedProduction) {
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| 377 | ParentHash = parentHash;
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| 378 | ParentPhrase = parentPhrase;
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| 379 | NewHash = newHash;
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| 380 | NewPhrase = newPhrase;
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| 381 | ExpandedSymbol = expandedSymbol;
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| 382 | ExpandedProduction = expandedProduction;
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| 383 | }
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| 384 | }
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| 385 |
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| 386 | #endregion
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[15712] | 387 | } |
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