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source: branches/HeuristicLab.Problems.MultiObjectiveTestFunctions/HeuristicLab.Problems.MultiObjectiveTestFunctions/3.3/Testfunctions/SchafferN1.cs @ 14067

Last change on this file since 14067 was 14067, checked in by mkommend, 8 years ago

#1087: Refactored multi-objective test functions.

File size: 2.8 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
21using System;
22using System.Collections.Generic;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Encodings.RealVectorEncoding;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27
28namespace HeuristicLab.Problems.MultiObjectiveTestFunctions {
29  [Item("SchafferN1", "Schaffer function N.1 for mulitobjective optimization from // https://en.wikipedia.org/wiki/Test_functions_for_optimization [30.11.2015]")]
30  [StorableClass]
31  public class SchafferN1 : MultiObjectiveTestFunction {
32
33    public override double[,] Bounds(int objectives) {
34      return new double[,] { { -1e5, 1e5 } };
35    }
36
37    public override bool[] Maximization(int objecitves) {
38      return new bool[2];
39    }
40
41    public override double[] ReferencePoint(int objecitves) {
42      return new double[] { 1e5, 1e5 };
43    }
44
45
46    public override IEnumerable<double[]> OptimalParetoFront(int objecitves) {
47      return PFStore.get("Schaffer");
48    }
49    public override double BestKnownHypervolume(int objectives) {
50      return Hypervolume.Calculate(OptimalParetoFront(objectives), ReferencePoint(objectives), Maximization(objectives));
51
52    }
53
54    [StorableConstructor]
55    protected SchafferN1(bool deserializing) : base(deserializing) { }
56    protected SchafferN1(SchafferN1 original, Cloner cloner) : base(original, cloner) { }
57    public override IDeepCloneable Clone(Cloner cloner) {
58      return new SchafferN1(this, cloner);
59    }
60
61    public SchafferN1() : base(minimumObjectives: 2, maximumObjectives: 2, minimumSolutionLength: 1, maximumSolutionLength: 1) { }
62
63    public override double[] Evaluate(RealVector r, int objectives) {
64      if (objectives != 2) throw new ArgumentException("The Schaffer N1 problem must always have 2 objectives");
65      if (r.Length != 1) return null;
66      double x = r[0];
67
68      //objective1
69      double f0 = x * x;
70
71      //objective0
72      double f1 = x - 2;
73      f1 *= f1;
74
75      return new double[] { f0, f1 };
76    }
77  }
78}
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