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source: trunk/sources/HeuristicLab.Problems.Instances.DataAnalysis/3.3/Regression/Vladislavleva/SineCosineFunction.cs @ 14228

Last change on this file since 14228 was 14228, checked in by gkronber, 8 years ago

#2371: added constructors to allow specification of random seeds for randomly generated regression problem instances (primarily for unit tests)

File size: 3.7 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Linq;
25using HeuristicLab.Common;
26using HeuristicLab.Random;
27
28namespace HeuristicLab.Problems.Instances.DataAnalysis {
29  public class SineCosineFunction : ArtificialRegressionDataDescriptor {
30
31    public override string Name { get { return "Vladislavleva-6 F6(X1, X2) = 6 * sin(X1) * cos(X2)"; } }
32    public override string Description {
33      get {
34        return "Paper: Order of Nonlinearity as a Complexity Measure for Models Generated by Symbolic Regression via Pareto Genetic Programming " + Environment.NewLine
35        + "Authors: Ekaterina J. Vladislavleva, Member, IEEE, Guido F. Smits, Member, IEEE, and Dick den Hertog" + Environment.NewLine
36        + "Function: F6(X1, X2) = 6 * sin(X1) * cos(X2)" + Environment.NewLine
37        + "Training Data: 30 points X1, X2 = Rand(0.1, 5.9)" + Environment.NewLine
38        + "Test Data: 306*306 points X1, X2 = (-0.05:0.02:6.05)" + Environment.NewLine
39        + "Function Set: +, -, *, /, square, e^x, e^-x, x^eps, x + eps, x * eps";
40      }
41    }
42    protected override string TargetVariable { get { return "Y"; } }
43    protected override string[] VariableNames { get { return new string[] { "X1", "X2", "Y" }; } }
44    protected override string[] AllowedInputVariables { get { return new string[] { "X1", "X2" }; } }
45    protected override int TrainingPartitionStart { get { return 0; } }
46    protected override int TrainingPartitionEnd { get { return 30; } }
47    protected override int TestPartitionStart { get { return 30; } }
48    protected override int TestPartitionEnd { get { return 30 + (306 * 306); } }
49    public int Seed { get; }
50
51    public SineCosineFunction() : this((int)DateTime.Now.Ticks) { }
52
53    public SineCosineFunction(int seed) : base() {
54      Seed = seed;
55    }
56    protected override List<List<double>> GenerateValues() {
57      List<List<double>> data = new List<List<double>>();
58      List<double> oneVariableTestData = SequenceGenerator.GenerateSteps(-0.05m, 6.05m, 0.02m).Select(v => (double)v).ToList();
59      List<List<double>> testData = new List<List<double>>() { oneVariableTestData, oneVariableTestData };
60      var combinations = ValueGenerator.GenerateAllCombinationsOfValuesInLists(testData).ToList<IEnumerable<double>>();
61
62      var rand = new MersenneTwister((uint)Seed);
63      for (int i = 0; i < AllowedInputVariables.Count(); i++) {
64        data.Add(ValueGenerator.GenerateUniformDistributedValues(rand.Next(), 30, 0.1, 5.9).ToList());
65        data[i].AddRange(combinations[i]);
66      }
67
68      double x1, x2;
69      List<double> results = new List<double>();
70      for (int i = 0; i < data[0].Count; i++) {
71        x1 = data[0][i];
72        x2 = data[1][i];
73        results.Add(6 * Math.Sin(x1) * Math.Cos(x2));
74      }
75      data.Add(results);
76
77      return data;
78    }
79  }
80}
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