#region License Information
/* HeuristicLab
* Copyright (C) 2002-2011 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.Collections.Generic;
using System.Linq;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
[StorableClass]
[Item("TypeCoherentExpressionGrammar", "Represents a grammar for functional expressions in which special syntactic constraints are enforced so that boolean and real-valued expressions are not mixed.")]
public class TypeCoherentExpressionGrammar : SymbolicExpressionGrammar, ISymbolicDataAnalysisGrammar {
private const string ArithmeticFunctionsName = "Arithmetic Functions";
private const string TrigonometricFunctionsName = "Trigonometric Functions";
private const string ExponentialFunctionsName = "Exponential and Logarithmic Functions";
private const string RealValuedSymbolsName = "Real Valued Symbols";
private const string TerminalsName = "Terminals";
private const string PowerFunctionsName = "Power Functions";
private const string ConditionsName = "Conditions";
private const string ComparisonsName = "Comparisons";
private const string BooleanOperatorsName = "Boolean Operators";
private const string ConditionalSymbolsName = "ConditionalSymbols";
private const string TimeSeriesSymbolsName = "Time Series Symbols";
[StorableConstructor]
protected TypeCoherentExpressionGrammar(bool deserializing) : base(deserializing) { }
protected TypeCoherentExpressionGrammar(TypeCoherentExpressionGrammar original, Cloner cloner) : base(original, cloner) { }
public TypeCoherentExpressionGrammar()
: base(ItemAttribute.GetName(typeof(TypeCoherentExpressionGrammar)), ItemAttribute.GetDescription(typeof(TypeCoherentExpressionGrammar))) {
Initialize();
}
public override IDeepCloneable Clone(Cloner cloner) {
return new TypeCoherentExpressionGrammar(this, cloner);
}
private void Initialize() {
#region symbol declaration
var add = new Addition();
var sub = new Subtraction();
var mul = new Multiplication();
var div = new Division();
var mean = new Average();
var sin = new Sine();
var cos = new Cosine();
var tan = new Tangent();
var log = new Logarithm();
var pow = new Power();
var root = new Root();
var exp = new Exponential();
var @if = new IfThenElse();
var gt = new GreaterThan();
var lt = new LessThan();
var and = new And();
var or = new Or();
var not = new Not();
var variableCondition = new VariableCondition();
var timeLag = new TimeLag();
var integral = new Integral();
var derivative = new Derivative();
var constant = new Constant();
constant.MinValue = -20;
constant.MaxValue = 20;
var variableSymbol = new Variable();
var laggedVariable = new LaggedVariable();
#endregion
#region group symbol declaration
var arithmeticSymbols = new GroupSymbol(ArithmeticFunctionsName, new List() { add, sub, mul, div, mean });
var trigonometricSymbols = new GroupSymbol(TrigonometricFunctionsName, new List() { sin, cos, tan });
var exponentialAndLogarithmicSymbols = new GroupSymbol(ExponentialFunctionsName, new List { exp, log });
var terminalSymbols = new GroupSymbol(TerminalsName, new List { constant, variableSymbol });
var realValuedSymbols = new GroupSymbol(RealValuedSymbolsName, new List() { arithmeticSymbols, trigonometricSymbols, exponentialAndLogarithmicSymbols, terminalSymbols });
var powerSymbols = new GroupSymbol(PowerFunctionsName, new List { pow, root });
var conditionSymbols = new GroupSymbol(ConditionsName, new List { @if, variableCondition });
var comparisonSymbols = new GroupSymbol(ComparisonsName, new List { gt, lt });
var booleanOperationSymbols = new GroupSymbol(BooleanOperatorsName, new List { and, or, not });
var conditionalSymbols = new GroupSymbol(ConditionalSymbolsName, new List { conditionSymbols, comparisonSymbols, booleanOperationSymbols });
var timeSeriesSymbols = new GroupSymbol(TimeSeriesSymbolsName, new List { timeLag, integral, derivative, laggedVariable });
#endregion
AddSymbol(realValuedSymbols);
AddSymbol(powerSymbols);
AddSymbol(conditionalSymbols);
AddSymbol(timeSeriesSymbols);
#region subtree count configuration
SetSubtreeCount(arithmeticSymbols, 2, 2);
SetSubtreeCount(trigonometricSymbols, 1, 1);
SetSubtreeCount(powerSymbols, 2, 2);
SetSubtreeCount(exponentialAndLogarithmicSymbols, 1, 1);
SetSubtreeCount(terminalSymbols, 0, 0);
SetSubtreeCount(@if, 3, 3);
SetSubtreeCount(variableCondition, 2, 2);
SetSubtreeCount(comparisonSymbols, 2, 2);
SetSubtreeCount(and, 2, 2);
SetSubtreeCount(or, 2, 2);
SetSubtreeCount(not, 1, 1);
SetSubtreeCount(timeLag, 1, 1);
SetSubtreeCount(integral, 1, 1);
SetSubtreeCount(derivative, 1, 1);
SetSubtreeCount(laggedVariable, 0, 0);
#endregion
#region allowed child symbols configuration
AddAllowedChildSymbol(StartSymbol, realValuedSymbols);
AddAllowedChildSymbol(DefunSymbol, realValuedSymbols);
AddAllowedChildSymbol(realValuedSymbols, realValuedSymbols);
AddAllowedChildSymbol(realValuedSymbols, powerSymbols);
AddAllowedChildSymbol(realValuedSymbols, conditionSymbols);
AddAllowedChildSymbol(realValuedSymbols, timeSeriesSymbols);
AddAllowedChildSymbol(powerSymbols, variableSymbol, 0);
AddAllowedChildSymbol(powerSymbols, laggedVariable, 0);
AddAllowedChildSymbol(powerSymbols, constant, 1);
AddAllowedChildSymbol(@if, comparisonSymbols, 0);
AddAllowedChildSymbol(@if, booleanOperationSymbols, 0);
AddAllowedChildSymbol(@if, conditionSymbols, 1);
AddAllowedChildSymbol(@if, realValuedSymbols, 1);
AddAllowedChildSymbol(@if, powerSymbols, 1);
AddAllowedChildSymbol(@if, timeSeriesSymbols, 1);
AddAllowedChildSymbol(@if, conditionSymbols, 2);
AddAllowedChildSymbol(@if, realValuedSymbols, 2);
AddAllowedChildSymbol(@if, powerSymbols, 2);
AddAllowedChildSymbol(@if, timeSeriesSymbols, 2);
AddAllowedChildSymbol(booleanOperationSymbols, comparisonSymbols);
AddAllowedChildSymbol(comparisonSymbols, realValuedSymbols);
AddAllowedChildSymbol(comparisonSymbols, powerSymbols);
AddAllowedChildSymbol(comparisonSymbols, conditionSymbols);
AddAllowedChildSymbol(comparisonSymbols, timeSeriesSymbols);
AddAllowedChildSymbol(variableCondition, realValuedSymbols);
AddAllowedChildSymbol(variableCondition, powerSymbols);
AddAllowedChildSymbol(variableCondition, conditionSymbols);
AddAllowedChildSymbol(variableCondition, timeSeriesSymbols);
AddAllowedChildSymbol(timeLag, realValuedSymbols);
AddAllowedChildSymbol(timeLag, powerSymbols);
AddAllowedChildSymbol(timeLag, conditionSymbols);
AddAllowedChildSymbol(integral, realValuedSymbols);
AddAllowedChildSymbol(integral, powerSymbols);
AddAllowedChildSymbol(integral, conditionSymbols);
AddAllowedChildSymbol(derivative, realValuedSymbols);
AddAllowedChildSymbol(derivative, powerSymbols);
AddAllowedChildSymbol(derivative, conditionSymbols);
#endregion
}
public void ConfigureAsDefaultRegressionGrammar() {
Symbols.Where(s => s is Average).First().Enabled = false;
Symbols.Where(s => s.Name == TrigonometricFunctionsName).First().Enabled = false;
Symbols.Where(s => s.Name == PowerFunctionsName).First().Enabled = false;
Symbols.Where(s => s.Name == ConditionalSymbolsName).First().Enabled = false;
Symbols.Where(s => s.Name == TimeSeriesSymbolsName).First().Enabled = false;
}
public void ConfigureAsDefaultClassificationGrammar() {
Symbols.Where(s => s is Average).First().Enabled = false;
Symbols.Where(s => s is VariableCondition).First().Enabled = false;
Symbols.Where(s => s.Name == TrigonometricFunctionsName).First().Enabled = false;
Symbols.Where(s => s.Name == ExponentialFunctionsName).First().Enabled = false;
Symbols.Where(s => s.Name == PowerFunctionsName).First().Enabled = false;
Symbols.Where(s => s.Name == TimeSeriesSymbolsName).First().Enabled = false;
}
public void ConfigureAsDefaultTimeSeriesPrognosisGrammar() {
Symbols.Where(s => s is Variable).First().Enabled = false;
Symbols.Where(s => s.Name == TrigonometricFunctionsName).First().Enabled = false;
Symbols.Where(s => s.Name == PowerFunctionsName).First().Enabled = false;
Symbols.Where(s => s.Name == ConditionalSymbolsName).First().Enabled = false;
}
}
}