# source:branches/RegressionBenchmarks/HeuristicLab.Problems.DataAnalysis.Benchmarks/3.4/RegressionBenchmarks/Korns/KornFunctionEight.cs@7044

Last change on this file since 7044 was 7044, checked in by sforsten, 11 years ago

#1669: real world problems have been added

File size: 3.1 KB
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2/* HeuristicLab
3 * Copyright (C) 2002-2011 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
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 HeuristicLab.Data;
25
26namespace HeuristicLab.Problems.DataAnalysis.Benchmarks {
27  public class KornFunctionEight : RegressionToyBenchmark {
28
29    public KornFunctionEight() {
30      Name = "Korn 8 y = 6.87 + (11 * cos(7.23 * X0 * X3 * X4))";
31      Description = "Paper: Accuracy in Symbolic Regression" + Environment.NewLine
32        + "Authors: Michael F. Korns" + Environment.NewLine
33        + "Function: y = 6.87 + (11 * cos(7.23 * X0 * X3 * X4))" + Environment.NewLine
34        + "Real Numbers: 3.45, -.982, 100.389, and all other real constants" + Environment.NewLine
35        + "Row Features: x1, x2, x9, and all other features" + Environment.NewLine
36        + "Binary Operators: +, -, *, /" + Environment.NewLine
37        + "Unary Operators: sqrt, square, cube, cos, sin, tan, tanh, log, exp" + Environment.NewLine
38        + "\"Our testing regimen uses only statistical best practices out-of-sample testing techniques. "
39        + "We test each of the test cases on matrices of 10000 rows by 1 to 5 columns with no noise. "
40        + "For each test a training matrix is filled with random numbers between -50 and +50. The test case "
41        + "target expressions are limited to one basis function whose maximum depth is three grammar nodes.\"";
42      targetVariable = "Y";
43      inputVariables = new List<string>() { "X0", "X3", "X4" };
44      trainingPartition = new IntRange(0, 5000);
45      testPartition = new IntRange(5001, 10000);
46    }
47
48    protected override List<double> GenerateTarget(List<List<double>> data) {
49      double x0, x3, x4;
50      List<double> results = new List<double>();
51      for (int i = 0; i < data[0].Count; i++) {
52        x0 = data[0][i];
53        x3 = data[1][i];
54        x4 = data[2][i];
55        results.Add(6.87 + (11 * Math.Cos(7.23 * x0 * x3 * x4)));
56      }
57      return results;
58    }
59
60    protected override List<List<double>> GenerateInput() {
61      List<List<double>> dataList = new List<List<double>>();
62      DoubleRange range = new DoubleRange(-50, 50);
63      for (int i = 0; i < inputVariables.Count; i++) {