#region License Information
/* HeuristicLab
* Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
*
* This file is part of HeuristicLab.
*
* HeuristicLab is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* HeuristicLab is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with HeuristicLab. If not, see .
*/
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using HeuristicLab.Collections;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Operators;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence;
using HeuristicLab.PluginInfrastructure;
namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Creators {
[StorableType("76264996-ed41-4e3b-899d-a98c4206c0b5")]
public class MultiSymbolicDataAnalysisExpressionCreator : StochasticMultiBranch,
ISymbolicDataAnalysisSolutionCreator,
ISymbolicExpressionTreeSizeConstraintOperator,
ISymbolicExpressionTreeGrammarBasedOperator {
private const string SymbolicExpressionTreeParameterName = "SymbolicExpressionTree";
private const string MaximumSymbolicExpressionTreeLengthParameterName = "MaximumSymbolicExpressionTreeLength";
private const string MaximumSymbolicExpressionTreeDepthParameterName = "MaximumSymbolicExpressionTreeDepth";
private const string SymbolicExpressionTreeGrammarParameterName = "SymbolicExpressionTreeGrammar";
private const string ClonedSymbolicExpressionTreeGrammarParameterName = "ClonedSymbolicExpressionTreeGrammar";
public override bool CanChangeName {
get { return false; }
}
protected override bool CreateChildOperation {
get { return true; }
}
#region parameter properties
public ILookupParameter SymbolicExpressionTreeParameter {
get { return (ILookupParameter)Parameters[SymbolicExpressionTreeParameterName]; }
}
public IValueLookupParameter MaximumSymbolicExpressionTreeLengthParameter {
get { return (IValueLookupParameter)Parameters[MaximumSymbolicExpressionTreeLengthParameterName]; }
}
public IValueLookupParameter MaximumSymbolicExpressionTreeDepthParameter {
get { return (IValueLookupParameter)Parameters[MaximumSymbolicExpressionTreeDepthParameterName]; }
}
public IValueLookupParameter SymbolicExpressionTreeGrammarParameter {
get { return (IValueLookupParameter)Parameters[SymbolicExpressionTreeGrammarParameterName]; }
}
public ILookupParameter ClonedSymbolicExpressionTreeGrammarParameter {
get { return (ILookupParameter)Parameters[ClonedSymbolicExpressionTreeGrammarParameterName]; }
}
#endregion
[StorableConstructor]
protected MultiSymbolicDataAnalysisExpressionCreator(StorableConstructorFlag deserializing) : base(deserializing) { }
protected MultiSymbolicDataAnalysisExpressionCreator(MultiSymbolicDataAnalysisExpressionCreator original, Cloner cloner) : base(original, cloner) { }
public override IDeepCloneable Clone(Cloner cloner) { return new MultiSymbolicDataAnalysisExpressionCreator(this, cloner); }
public MultiSymbolicDataAnalysisExpressionCreator()
: base() {
Parameters.Add(new LookupParameter(SymbolicExpressionTreeParameterName, "The symbolic expression tree on which the operator should be applied."));
Parameters.Add(new ValueLookupParameter(MaximumSymbolicExpressionTreeLengthParameterName, "The maximal length (number of nodes) of the symbolic expression tree."));
Parameters.Add(new ValueLookupParameter(MaximumSymbolicExpressionTreeDepthParameterName, "The maximal depth of the symbolic expression tree (a tree with one node has depth = 0)."));
Parameters.Add(new ValueLookupParameter(SymbolicExpressionTreeGrammarParameterName, "The tree grammar that defines the correct syntax of symbolic expression trees that should be created."));
Parameters.Add(new LookupParameter(ClonedSymbolicExpressionTreeGrammarParameterName, "An immutable clone of the concrete grammar that is actually used to create and manipulate trees."));
List list = new List();
foreach (Type type in ApplicationManager.Manager.GetTypes(typeof(ISymbolicDataAnalysisSolutionCreator))) {
if (this.GetType().Assembly != type.Assembly) continue;
if (typeof(IMultiOperator).IsAssignableFrom(type)) continue;
list.Add((ISymbolicDataAnalysisSolutionCreator)Activator.CreateInstance(type));
}
CheckedItemList checkedItemList = new CheckedItemList();
checkedItemList.AddRange(list.OrderBy(op => op.Name));
Operators = checkedItemList.AsReadOnly();
Operators_ItemsAdded(this, new CollectionItemsChangedEventArgs>(Operators.CheckedItems));
}
public override IOperation InstrumentedApply() {
if (ClonedSymbolicExpressionTreeGrammarParameter.ActualValue == null) {
SymbolicExpressionTreeGrammarParameter.ActualValue.ReadOnly = true;
IScope globalScope = ExecutionContext.Scope;
while (globalScope.Parent != null)
globalScope = globalScope.Parent;
globalScope.Variables.Add(new Core.Variable(ClonedSymbolicExpressionTreeGrammarParameterName, (ISymbolicExpressionGrammar)SymbolicExpressionTreeGrammarParameter.ActualValue.Clone()));
}
return base.InstrumentedApply();
}
public ISymbolicExpressionTree CreateTree(IRandom random, ISymbolicExpressionGrammar grammar, int maxTreeLength, int maxTreeDepth) {
double sum = Operators.CheckedItems.Sum(o => Probabilities[o.Index]);
if (sum.IsAlmost(0)) throw new InvalidOperationException(Name + ": All selected operators have zero probability.");
double r = random.NextDouble() * sum;
sum = 0;
int index = -1;
foreach (var indexedItem in Operators.CheckedItems) {
sum += Probabilities[indexedItem.Index];
if (sum > r) {
index = indexedItem.Index;
break;
}
}
return Operators[index].CreateTree(random, grammar, maxTreeLength, maxTreeDepth);
}
protected override void Operators_ItemsReplaced(object sender, CollectionItemsChangedEventArgs> e) {
base.Operators_ItemsReplaced(sender, e);
ParameterizeTreeCreators();
}
protected override void Operators_ItemsAdded(object sender, CollectionItemsChangedEventArgs> e) {
base.Operators_ItemsAdded(sender, e);
ParameterizeTreeCreators();
}
private void ParameterizeTreeCreators() {
foreach (IStochasticOperator creator in Operators.OfType()) {
creator.RandomParameter.ActualName = RandomParameter.Name;
}
foreach (ISymbolicExpressionTreeCreator creator in Operators.OfType()) {
creator.SymbolicExpressionTreeParameter.ActualName = SymbolicExpressionTreeParameter.Name;
}
foreach (ISymbolicExpressionTreeSizeConstraintOperator creator in Operators.OfType()) {
creator.MaximumSymbolicExpressionTreeDepthParameter.ActualName = MaximumSymbolicExpressionTreeDepthParameter.Name;
creator.MaximumSymbolicExpressionTreeLengthParameter.ActualName = MaximumSymbolicExpressionTreeLengthParameter.Name;
}
foreach (ISymbolicExpressionTreeGrammarBasedOperator creator in Operators.OfType()) {
creator.SymbolicExpressionTreeGrammarParameter.ActualName = SymbolicExpressionTreeGrammarParameter.Name;
}
}
}
}