1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.Text;
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5 | using System.Threading.Tasks;
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6 | using HeuristicLab.Common;
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7 | using HeuristicLab.Core;
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8 | using HeuristicLab.Data;
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9 | using HeuristicLab.Encodings.RealVectorEncoding;
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10 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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11 | using HeuristicLab.Problems.MultiObjectiveTestFunction;
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12 |
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13 | namespace HeuristicLab.Problems.TestFunctions {
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14 | [Item("ZDT4", "//http://www.tik.ee.ethz.ch/sop/download/supplementary/testproblems/ [30.11.2015]")]
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15 | [StorableClass]
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16 | public class ZDT4 : MultiObjectiveTestFunction {
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17 |
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18 | public override DoubleMatrix Bounds {
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19 | get {
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20 | return new DoubleMatrix(new double[,] { { 0, 1 } }); //definition in the source is contradicting itself the known paretofront is for [0,1]
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21 | }
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22 | }
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23 |
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24 | public override bool[] Maximization {
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25 | get {
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26 | return new bool[] { false, false };
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27 | }
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28 | }
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29 |
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30 | public override int MaximumProblemSize {
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31 | get {
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32 | return int.MaxValue;
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33 | }
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34 | }
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35 |
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36 | public override int MaximumSolutionSize {
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37 | get {
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38 | return 2;
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39 | }
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40 | }
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41 |
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42 | public override int MinimumProblemSize {
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43 | get {
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44 | return 1;
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45 | }
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46 | }
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47 |
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48 | public override int MinimumSolutionSize {
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49 | get {
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50 | return 2;
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51 | }
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52 | }
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53 |
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54 | public override int ActualSolutionSize {
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55 | get {
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56 | return 2;
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57 | }
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58 |
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59 | set {
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60 | }
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61 | }
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62 |
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63 | [StorableConstructor]
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64 | protected ZDT4(bool deserializing) : base(deserializing) { }
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65 | protected ZDT4(ZDT4 original, Cloner cloner) : base(original, cloner) { }
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66 | public ZDT4() : base() { }
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67 |
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68 | public override IDeepCloneable Clone(Cloner cloner) {
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69 | return new ZDT4(this, cloner);
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70 | }
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71 |
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72 |
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73 |
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74 | public override double[] Evaluate(RealVector r) {
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75 | double g = 0;
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76 | for (int i = 1; i < r.Length; i++) {
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77 | double v = r[i];
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78 | g += v * v - 10 * Math.Cos(4 * Math.PI * v);
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79 | }
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80 | g = 1.0 + 10.0 * (r.Length - 1) + g;
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81 | double d = r[0] / g;
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82 | return new double[] { r[0], g * (1.0 - d * d) };
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83 | }
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84 | }
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85 | }
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