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source: branches/1614_GeneralizedQAP/HeuristicLab.Optimization/3.3/BasicProblems/Operators/SingleObjectiveMoveGenerator.cs @ 17778

Last change on this file since 17778 was 16728, checked in by abeham, 6 years ago

#1614: updated to new persistence and .NET 4.6.1

File size: 3.4 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2019 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;
23using System.Collections.Generic;
24using System.Globalization;
25using System.Linq;
26using HeuristicLab.Common;
27using HeuristicLab.Core;
28using HeuristicLab.Data;
29using HeuristicLab.Operators;
30using HeuristicLab.Parameters;
31using HEAL.Attic;
32
33namespace HeuristicLab.Optimization {
34  [Item("Single-objective MoveGenerator", "Calls the GetNeighbors method of the problem definition to obtain the moves.")]
35  [StorableType("CB37E7D8-EAC3-4061-9D39-20538CD1064D")]
36  public class SingleObjectiveMoveGenerator : SingleSuccessorOperator, INeighborBasedOperator, IMultiMoveGenerator, IStochasticOperator, ISingleObjectiveMoveOperator {
37    public ILookupParameter<IRandom> RandomParameter {
38      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
39    }
40
41    public IValueLookupParameter<IntValue> SampleSizeParameter {
42      get { return (IValueLookupParameter<IntValue>)Parameters["SampleSize"]; }
43    }
44
45    public ILookupParameter<IEncoding> EncodingParameter {
46      get { return (ILookupParameter<IEncoding>)Parameters["Encoding"]; }
47    }
48
49    public Func<Individual, IRandom, IEnumerable<Individual>> GetNeighborsFunc { get; set; }
50
51    [StorableConstructor]
52    protected SingleObjectiveMoveGenerator(StorableConstructorFlag _) : base(_) { }
53    protected SingleObjectiveMoveGenerator(SingleObjectiveMoveGenerator original, Cloner cloner)
54      : base(original, cloner) { }
55    public SingleObjectiveMoveGenerator() {
56      Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator to use."));
57      Parameters.Add(new ValueLookupParameter<IntValue>("SampleSize", "The number of moves to sample."));
58      Parameters.Add(new LookupParameter<IEncoding>("Encoding", "An item that holds the problem's encoding."));
59    }
60
61    public override IDeepCloneable Clone(Cloner cloner) {
62      return new SingleObjectiveMoveGenerator(this, cloner);
63    }
64
65    public override IOperation Apply() {
66      var random = RandomParameter.ActualValue;
67      var sampleSize = SampleSizeParameter.ActualValue.Value;
68      var encoding = EncodingParameter.ActualValue;
69      var individual = encoding.GetIndividual(ExecutionContext.Scope);
70      var nbhood = GetNeighborsFunc(individual, random).Take(sampleSize).ToList();
71
72      var moveScopes = new Scope[nbhood.Count];
73      for (int i = 0; i < moveScopes.Length; i++) {
74        moveScopes[i] = new Scope(i.ToString(CultureInfo.InvariantCulture.NumberFormat));
75        nbhood[i].CopyToScope(moveScopes[i]);
76      }
77      ExecutionContext.Scope.SubScopes.AddRange(moveScopes);
78
79      return base.Apply();
80    }
81  }
82}
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