HeuristicLab.Optimization.Operators/3.3/SingleObjectivePathRelinker.cs

   1 #region License Information
   2 /* HeuristicLab
   3  * Copyright (C) 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
  22 using HeuristicLab.Common;
  23 using HeuristicLab.Core;
  24 using HeuristicLab.Data;
  25 using HeuristicLab.Operators;
  26 using HeuristicLab.Parameters;
  27 using HEAL.Attic;
  28
  29 namespace HeuristicLab.Optimization.Operators {
  30   /// <summary>
  31   /// A base class for operators that perform path relinking between single objective solutions.
  32   /// </summary>
  33   [Item("SingleObjectivePathRelinker", "A base class for operators that perform path relinking between single objective solutions.")]
  34   [StorableType("364CE8A7-0258-4EC1-BBDB-E40C944BD196")]
  35   public abstract class SingleObjectivePathRelinker : SingleSuccessorOperator, ISingleObjectivePathRelinker {
  36     #region Parameter properties
  37     public ScopeParameter CurrentScopeParameter {
  38       get { return (ScopeParameter)Parameters["CurrentScope"]; }
  39     }
  40     public ILookupParameter<ItemArray<IItem>> ParentsParameter {
  41       get { return (IScopeTreeLookupParameter<IItem>)Parameters["Parents"]; }
  42     }
  43     public IValueParameter<PercentValue> RelinkingAccuracyParameter {
  44       get { return (IValueParameter<PercentValue>)Parameters["RelinkingAccuracy"]; }
  45     }
  46     #endregion
  47
  48     #region Properties
  49     private IScope CurrentScope {
  50       get { return CurrentScopeParameter.ActualValue; }
  51     }
  52     private ItemArray<IItem> Parents {
  53       get { return ParentsParameter.ActualValue; }
  54     }
  55     private PercentValue RelinkingAccuracy {
  56       get { return RelinkingAccuracyParameter.Value; }
  57     }
  58     #endregion
  59
  60     [StorableConstructor]
  61     protected SingleObjectivePathRelinker(StorableConstructorFlag _) : base(_) { }
  62     protected SingleObjectivePathRelinker(SingleObjectivePathRelinker original, Cloner cloner) : base(original, cloner) { }
  63     protected SingleObjectivePathRelinker()
  64       : base() {
  65       #region Create parameters
  66       Parameters.Add(new ScopeParameter("CurrentScope", "The current scope that contains the parents."));
  67       Parameters.Add(new ScopeTreeLookupParameter<IItem>("Parents", "The parents used for path relinking."));
  68       Parameters.Add(new ValueParameter<PercentValue>("RelinkingAccuracy", "The percentage of relinked offspring that should be yielded.", new PercentValue(0.25)));
  69       #endregion
  70     }
  71
  72     public sealed override IOperation Apply() {
  73       ItemArray<IItem> relinkedSolutions = Relink(Parents, RelinkingAccuracy);
  74       var offspringScope = new Scope("Offspring");
  75       foreach (var solution in relinkedSolutions) {
  76         var scope = new Scope();
  77         scope.Variables.Add(new Variable(ParentsParameter.ActualName, solution));
  78         offspringScope.SubScopes.Add(scope);
  79       }
  80       CurrentScope.SubScopes.Add(offspringScope);
  81       return base.Apply();
  82     }
  83
  84     protected abstract ItemArray<IItem> Relink(ItemArray<IItem> parents, PercentValue n);
  85   }
  86 }