[11666] | 1 | #region License Information
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[11956] | 2 |
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[11666] | 3 | /* HeuristicLab
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[14186] | 4 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[11666] | 5 | *
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| 6 | * This file is part of HeuristicLab.
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| 7 | *
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| 8 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 9 | * it under the terms of the GNU General Public License as published by
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| 10 | * the Free Software Foundation, either version 3 of the License, or
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| 11 | * (at your option) any later version.
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| 12 | *
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| 13 | * HeuristicLab is distributed in the hope that it will be useful,
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | * GNU General Public License for more details.
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| 17 | *
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| 18 | * You should have received a copy of the GNU General Public License
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| 19 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 20 | */
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[11956] | 21 |
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[11666] | 22 | #endregion
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| 23 |
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| 24 | using System;
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| 25 | using HeuristicLab.Common;
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| 26 | using HeuristicLab.Core;
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[11987] | 27 | using HeuristicLab.Encodings.BinaryVectorEncoding;
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[11666] | 28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 29 |
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[11987] | 30 | namespace HeuristicLab.Problems.Binary {
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[13295] | 31 | [Item("Hierararchical If and only If problem (HIFF)", "Genome evaluated in nested subsets to see if each subset contains either all 0s or all 1s.")]
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[11666] | 32 | [StorableClass]
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[12708] | 33 | [Creatable(CreatableAttribute.Categories.CombinatorialProblems, Priority = 220)]
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[11987] | 34 | public class HIFFProblem : BinaryProblem {
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[11666] | 35 | [StorableConstructor]
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| 36 | protected HIFFProblem(bool deserializing) : base(deserializing) { }
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| 37 | protected HIFFProblem(HIFFProblem original, Cloner cloner)
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| 38 | : base(original, cloner) {
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| 39 | }
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| 40 | public override IDeepCloneable Clone(Cloner cloner) {
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| 41 | return new HIFFProblem(this, cloner);
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| 42 | }
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| 43 |
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| 44 | public override bool Maximization {
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| 45 | get { return true; }
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| 46 | }
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| 47 |
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[11956] | 48 | public HIFFProblem()
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| 49 | : base() {
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[12708] | 50 | Encoding.Length = 64;
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[11666] | 51 | }
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[11838] | 52 | // In the GECCO paper, Section 4.1
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[11987] | 53 | public override double Evaluate(BinaryVector individual, IRandom random) {
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[11666] | 54 | int[] level = new int[individual.Length];
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| 55 | int levelLength = individual.Length;
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| 56 |
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| 57 | // Initialize the level to the current solution
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| 58 | for (int i = 0; i < levelLength; i++) {
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| 59 | level[i] = Convert.ToInt32(individual[i]);
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| 60 | }
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| 61 | int power = 1;
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| 62 | int nextLength = levelLength / 2;
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| 63 | int total = 0;
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| 64 | int maximum = 0;
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| 65 |
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| 66 | // Keep going while the next level actual has bits in it
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| 67 | while (nextLength > 0) {
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| 68 | int[] nextLevel = new int[nextLength];
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| 69 | // Construct the next level using the current level
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| 70 | for (int i = 0; i + 1 < levelLength; i += 2) {
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| 71 | if (level[i] == level[i + 1] && level[i] != -1) {
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| 72 | // Score points for a correct setting at this level
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| 73 | total += power;
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| 74 | nextLevel[i / 2] = level[i];
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| 75 | } else {
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| 76 | nextLevel[i / 2] = -1;
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| 77 | }
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| 78 | // Keep track of the maximum possible score
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| 79 | maximum += power;
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| 80 | }
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| 81 | level = nextLevel;
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| 82 | levelLength = nextLength;
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| 83 | nextLength = levelLength / 2;
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| 84 | power *= 2;
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| 85 | }
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| 86 |
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| 87 | // Convert to percentage of total
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| 88 | return (double)total / maximum;
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| 89 | }
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| 90 | }
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| 91 | }
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