1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2008 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 System.Collections.Generic;
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23 | using HeuristicLab.Core;
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24 | using HeuristicLab.Data;
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25 | using HeuristicLab.GP.Interfaces;
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26 | using HeuristicLab.GP;
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27 |
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28 | namespace HeuristicLab.GP.StructureIdentification {
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29 | [SymbolicRegressionFunctionLibraryInjector]
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30 | public class SimpleFunctionLibraryInjector : FunctionLibraryInjectorBase {
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31 | public const string MINTIMEOFFSET = "MinTimeOffset";
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32 | public const string MAXTIMEOFFSET = "MaxTimeOffset";
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33 |
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34 | private int minTimeOffset;
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35 | private int maxTimeOffset;
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36 |
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37 | public override string Description {
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38 | get { return @"Injects a simple function library for regression and classification problems."; }
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39 | }
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40 |
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41 | public SimpleFunctionLibraryInjector()
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42 | : base() {
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43 | AddVariableInfo(new VariableInfo(MINTIMEOFFSET, "Minimal time offset for all features", typeof(IntData), VariableKind.In));
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44 | AddVariableInfo(new VariableInfo(MAXTIMEOFFSET, "Maximal time offset for all feature", typeof(IntData), VariableKind.In));
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45 | }
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46 |
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47 | public override IOperation Apply(IScope scope) {
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48 | // try to get minTimeOffset (use 0 as default if not available)
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49 | IItem minTimeOffsetItem = GetVariableValue(MINTIMEOFFSET, scope, true, false);
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50 | minTimeOffset = minTimeOffsetItem == null ? 0 : ((IntData)minTimeOffsetItem).Data;
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51 | // try to get maxTimeOffset (use 0 as default if not available)
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52 | IItem maxTimeOffsetItem = GetVariableValue(MAXTIMEOFFSET, scope, true, false);
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53 | maxTimeOffset = maxTimeOffsetItem == null ? 0 : ((IntData)maxTimeOffsetItem).Data;
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54 |
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55 | return base.Apply(scope);
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56 | }
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57 |
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58 | protected override FunctionLibrary CreateFunctionLibrary() {
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59 | return Create(
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60 | minTimeOffset,
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61 | maxTimeOffset);
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62 | }
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63 |
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64 | public static FunctionLibrary Create(int minTimeOffset, int maxTimeOffset) {
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65 | FunctionLibrary functionLibrary = new FunctionLibrary();
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66 |
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67 | Variable variable = new Variable();
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68 | Constant constant = new Constant();
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69 | Differential differential = new Differential();
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70 | Addition addition = new Addition();
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71 | Cosinus cosinus = new Cosinus();
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72 | Division division = new Division();
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73 | Exponential exponential = new Exponential();
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74 | Logarithm logarithm = new Logarithm();
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75 | Multiplication multiplication = new Multiplication();
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76 | Power power = new Power();
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77 | Sinus sinus = new Sinus();
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78 | Sqrt sqrt = new Sqrt();
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79 | Subtraction subtraction = new Subtraction();
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80 | Tangens tangens = new Tangens();
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81 |
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82 | List<IFunction> valueNodes = new List<IFunction>() {
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83 | differential, variable, constant
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84 | };
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85 | List<IFunction> arithmeticFunctions = new List<IFunction>() {
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86 | addition, division, multiplication, subtraction,
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87 | };
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88 |
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89 | List<IFunction> complexFunctions = new List<IFunction>() {
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90 | cosinus, exponential, logarithm, power, sinus, sqrt, tangens
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91 | };
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92 |
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93 | List<IFunction> allFunctions = new List<IFunction>();
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94 | allFunctions.AddRange(arithmeticFunctions);
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95 | allFunctions.AddRange(complexFunctions);
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96 | allFunctions.AddRange(valueNodes);
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97 |
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98 | SetAllowedSubOperators(addition, allFunctions);
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99 | SetAllowedSubOperators(division, allFunctions);
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100 | SetAllowedSubOperators(multiplication, allFunctions);
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101 | SetAllowedSubOperators(subtraction, allFunctions);
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102 |
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103 | SetAllowedSubOperators(cosinus, valueNodes);
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104 | SetAllowedSubOperators(exponential, valueNodes);
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105 | SetAllowedSubOperators(logarithm, valueNodes);
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106 | SetAllowedSubOperators(power, valueNodes);
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107 | SetAllowedSubOperators(sinus, valueNodes);
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108 | SetAllowedSubOperators(sqrt, valueNodes);
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109 | SetAllowedSubOperators(tangens, valueNodes);
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110 |
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111 | allFunctions.ForEach(x => functionLibrary.AddFunction(x));
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112 |
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113 | variable.SetConstraints(minTimeOffset, maxTimeOffset);
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114 | differential.SetConstraints(minTimeOffset, maxTimeOffset);
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115 |
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116 | return functionLibrary;
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117 | }
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118 | }
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119 | }
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