1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2018 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.Linq;
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23 | using HeuristicLab.Problems.Instances.DataAnalysis;
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24 | using Microsoft.VisualStudio.TestTools.UnitTesting;
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25 |
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26 | namespace HeuristicLab.Algorithms.DataAnalysis.Tests {
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27 | [TestClass]
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28 |
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29 | // reference values calculated with Rasmussen's GPML MATLAB package
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30 | public class GaussianProcessModelTest {
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31 | [TestMethod]
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32 | [TestCategory("General")]
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33 | [TestProperty("Time", "medium")]
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34 | public void GaussianProcessModelOutputTest() {
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35 | var provider = new RegressionCSVInstanceProvider();
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36 | var problemData = provider.ImportData(@"Test Resources\co2.txt");
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37 |
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38 | var targetVariable = "interpolated";
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39 | var allowedInputVariables = new string[] { "decimal date" };
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40 | var rows = Enumerable.Range(0, 401);
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41 |
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42 | var meanFunction = new MeanConst();
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43 | var covarianceFunction = new CovarianceSum();
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44 | covarianceFunction.Terms.Add(new CovarianceSquaredExponentialIso());
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45 | var prod = new CovarianceProduct();
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46 | prod.Factors.Add(new CovarianceSquaredExponentialIso());
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47 | prod.Factors.Add(new CovariancePeriodic());
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48 | covarianceFunction.Terms.Add(prod);
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49 |
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50 | {
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51 | var hyp = new double[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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52 | var model = new GaussianProcessModel(problemData.Dataset, targetVariable, allowedInputVariables, rows, hyp,
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53 | meanFunction,
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54 | covarianceFunction);
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55 | Assert.AreEqual(4.3170e+004, model.NegativeLogLikelihood, 1);
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56 |
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57 | var dHyp = model.HyperparameterGradients;
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58 | Assert.AreEqual(-248.7932, dHyp[0], 1E-2);
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59 | var dHypCovExpected = new double[] { -0.5550e4, -5.5533e4, -0.2511e4, -2.7625e4, -1.3033e4, 0.0289e4, -2.7625e4 };
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60 | AssertEqual(dHypCovExpected, dHyp.Skip(1).Take(7).ToArray(), 1);
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61 | Assert.AreEqual(-2.0171e+003, dHyp.Last(), 1);
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62 |
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63 |
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64 | var predTrain = model.GetEstimatedValues(problemData.Dataset, new int[] { 0, 400 }).ToArray();
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65 | Assert.AreEqual(310.5930, predTrain[0], 1e-3);
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66 | Assert.AreEqual(347.9993, predTrain[1], 1e-3);
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67 |
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68 | var predTrainVar = model.GetEstimatedVariances(problemData.Dataset, problemData.TrainingIndices).ToArray();
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69 | }
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70 |
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71 | {
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72 | var hyp = new double[] { 0.029973094285941, 0.455535210579926, 3.438647883940457, 1.464114485889487, 3.001788584487478, 3.815289323309630, 4.374914122810222, 3.001788584487478, 0.716427415979145 };
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73 | var model = new GaussianProcessModel(problemData.Dataset, targetVariable, allowedInputVariables, rows, hyp,
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74 | meanFunction,
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75 | covarianceFunction);
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76 | Assert.AreEqual(872.8448, model.NegativeLogLikelihood, 1e-3);
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77 |
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78 | var dHyp = model.HyperparameterGradients;
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79 | Assert.AreEqual(-0.0046, dHyp[0], 1e-3);
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80 | var dHypCovExpected = new double[] { 0.2652, -0.2386, 0.1706, -0.1744, 0.0000, 0.0000, -0.1744 };
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81 | AssertEqual(dHypCovExpected, dHyp.Skip(1).Take(7).ToArray(), 1e-3);
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82 | Assert.AreEqual(0.8621, dHyp.Last(), 1e-3);
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83 |
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84 | var predTrain = model.GetEstimatedValues(problemData.Dataset, new int[] { 0, 400 }).ToArray();
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85 | Assert.AreEqual(315.3692, predTrain[0], 1e-3);
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86 | Assert.AreEqual(356.6076, predTrain[1], 1e-3);
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87 | }
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88 | }
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89 |
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90 |
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91 | private void AssertEqual(double[] expected, double[] actual, double delta = 1E-3) {
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92 | Assert.AreEqual(expected.Length, actual.Length);
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93 | for (int i = 0; i < expected.Length; i++)
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94 | Assert.AreEqual(expected[i], actual[i], delta);
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95 | }
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96 | }
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97 | }
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