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source: branches/2877_HiveImprovements/HeuristicLab.Algorithms.ScatterSearch/3.3/PopulationRebuildMethod.cs @ 16332

Last change on this file since 16332 was 15583, checked in by swagner, 7 years ago

#2640: Updated year of copyrights in license headers

File size: 4.8 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2018 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
21
22using System.Linq;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Data;
26using HeuristicLab.Operators;
27using HeuristicLab.Optimization;
28using HeuristicLab.Parameters;
29using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
30
31namespace HeuristicLab.Algorithms.ScatterSearch {
32  /// <summary>
33  /// An operator that updates the reference set and rebuilds the population.
34  /// </summary>
35  [Item("PopulationRebuildMethod", "An operator that updates the reference set and rebuilds the population.")]
36  [StorableClass]
37  public sealed class PopulationRebuildMethod : SingleSuccessorOperator, ISingleObjectiveOperator {
38    #region Parameter properties
39    public ScopeParameter CurrentScopeParameter {
40      get { return (ScopeParameter)Parameters["CurrentScope"]; }
41    }
42    public IValueLookupParameter<BoolValue> MaximizationParameter {
43      get { return (IValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
44    }
45    public IValueLookupParameter<IntValue> NumberOfHighQualitySolutionsParameter {
46      get { return (IValueLookupParameter<IntValue>)Parameters["NumberOfHighQualitySolutions"]; }
47    }
48    public IValueLookupParameter<IItem> QualityParameter {
49      get { return (IValueLookupParameter<IItem>)Parameters["Quality"]; }
50    }
51    public IValueLookupParameter<IntValue> ReferenceSetSizeParameter {
52      get { return (IValueLookupParameter<IntValue>)Parameters["ReferenceSetSize"]; }
53    }
54    #endregion
55
56    #region Properties
57    private IScope CurrentScope {
58      get { return CurrentScopeParameter.ActualValue; }
59    }
60    private BoolValue Maximization {
61      get { return MaximizationParameter.ActualValue; }
62      set { MaximizationParameter.ActualValue = value; }
63    }
64    private IntValue NumberOfHighQualitySolutions {
65      get { return NumberOfHighQualitySolutionsParameter.ActualValue; }
66      set { NumberOfHighQualitySolutionsParameter.ActualValue = value; }
67    }
68    private IItem Quality {
69      get { return QualityParameter.ActualValue; }
70    }
71    private IntValue ReferenceSetSize {
72      get { return ReferenceSetSizeParameter.ActualValue; }
73      set { ReferenceSetSizeParameter.ActualValue = value; }
74    }
75    #endregion
76
77    [StorableConstructor]
78    private PopulationRebuildMethod(bool deserializing) : base(deserializing) { }
79    private PopulationRebuildMethod(PopulationRebuildMethod original, Cloner cloner) : base(original, cloner) { }
80    public PopulationRebuildMethod()
81      : base() {
82      #region Create parameters
83      Parameters.Add(new ScopeParameter("CurrentScope", "The current scope that contains the population and the reference set."));
84      Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, otherwise false."));
85      Parameters.Add(new ValueLookupParameter<IntValue>("NumberOfHighQualitySolutions", "The number of high quality solutions in the reference set."));
86      Parameters.Add(new ValueLookupParameter<IItem>("Quality", "This parameter is used for name translation only."));
87      Parameters.Add(new ValueLookupParameter<IntValue>("ReferenceSetSize", "The size of the reference set."));
88      #endregion
89    }
90
91    public override IDeepCloneable Clone(Cloner cloner) {
92      return new PopulationRebuildMethod(this, cloner);
93    }
94
95    public override IOperation Apply() {
96      IScope populationScope = CurrentScope.SubScopes[0];
97      IScope referenceSetScope = CurrentScope.SubScopes[1];
98      var orderedReferenceSet = Maximization.Value ? referenceSetScope.SubScopes.OrderByDescending(r => r.Variables[QualityParameter.ActualName].Value) :
99                                                     referenceSetScope.SubScopes.OrderBy(r => r.Variables[QualityParameter.ActualName].Value);
100      referenceSetScope.SubScopes.Replace(orderedReferenceSet.Take(NumberOfHighQualitySolutions.Value).ToList());
101      populationScope.SubScopes.Clear();
102      return base.Apply();
103    }
104  }
105}
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