[7849] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2012 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;
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| 23 | using System.Collections.Generic;
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| 24 | using System.Linq;
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| 25 |
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| 26 | namespace HeuristicLab.Problems.Instances.DataAnalysis {
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| 27 | public class NguyenFunctionFour : ArtificialRegressionDataDescriptor {
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| 28 |
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[8224] | 29 | public override string Name { get { return "Nguyen F4 = x^6 + x^5 + x^4 + x³ + x² + x"; } }
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[7849] | 30 | public override string Description {
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| 31 | get {
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| 32 | return "Paper: Semantically-based Crossover in Genetic Programming: Application to Real-valued Symbolic Regression" + Environment.NewLine
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| 33 | + "Authors: Nguyen Quang Uy · Nguyen Xuan Hoai · Michael O’Neill · R.I. McKay · Edgar Galvan-Lopez" + Environment.NewLine
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[8224] | 34 | + "Function: F4 = x^6 + x^5 + x^4 + x³ + x² + x" + Environment.NewLine
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| 35 | + "Fitcases: 20 random points in [-1, 1]" + Environment.NewLine
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| 36 | + "Non-terminals: +, -, *, % (protected division), sin, cos, exp, ln(|x|) (protected log)" + Environment.NewLine
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| 37 | + "Terminals: only variables (no random constants)";
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[7849] | 38 | }
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| 39 | }
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| 40 | protected override string TargetVariable { get { return "Y"; } }
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| 41 | protected override string[] InputVariables { get { return new string[] { "X", "Y" }; } }
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| 42 | protected override string[] AllowedInputVariables { get { return new string[] { "X" }; } }
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| 43 | protected override int TrainingPartitionStart { get { return 0; } }
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| 44 | protected override int TrainingPartitionEnd { get { return 20; } }
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| 45 | protected override int TestPartitionStart { get { return 250; } }
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| 46 | protected override int TestPartitionEnd { get { return 350; } }
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| 47 |
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| 48 | protected override List<List<double>> GenerateValues() {
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| 49 | List<List<double>> data = new List<List<double>>();
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| 50 | data.Add(ValueGenerator.GenerateUniformDistributedValues(500, -1, 1).ToList());
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| 51 |
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| 52 | double x;
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| 53 | List<double> results = new List<double>();
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| 54 | for (int i = 0; i < data[0].Count; i++) {
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| 55 | x = data[0][i];
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| 56 | results.Add(Math.Pow(x, 6) + Math.Pow(x, 5) + Math.Pow(x, 4) + Math.Pow(x, 3) + Math.Pow(x, 2) + x);
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| 57 | }
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| 58 | data.Add(results);
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| 59 |
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| 60 | return data;
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| 61 | }
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| 62 | }
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| 63 | }
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