source: branches/2521_ProblemRefactoring/HeuristicLab.Optimization/3.3/BasicProblems/Operators/SingleObjectiveMoveEvaluator.cs @ 17577

Last change on this file since 17577 was 17577, checked in by abeham, 2 years ago

#2521: remove scope-based contexts, add helper methods to ScopeUtil, adapt operators

File size: 3.7 KB
Line 
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
22using System;
23using System.Threading;
24using HEAL.Attic;
25using HeuristicLab.Common;
26using HeuristicLab.Core;
27using HeuristicLab.Data;
28using HeuristicLab.Operators;
29using HeuristicLab.Parameters;
30
31namespace HeuristicLab.Optimization {
32  [Item("Single-objective MoveEvaluator", "Evaluates a parameter vector that results from a move.")]
33  [StorableType("EE4B1EBA-50BF-40C7-B338-F4A9D9CC554E")]
34  internal sealed class SingleObjectiveMoveEvaluator<TEncodedSolution> : SingleSuccessorOperator, ISingleObjectiveEvaluationOperator<TEncodedSolution>, ISingleObjectiveMoveEvaluator, IStochasticOperator, ISingleObjectiveMoveOperator
35  where TEncodedSolution : class, IEncodedSolution {
36
37    public ILookupParameter<IRandom> RandomParameter {
38      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
39    }
40
41    public ILookupParameter<IEncoding<TEncodedSolution>> EncodingParameter {
42      get { return (ILookupParameter<IEncoding<TEncodedSolution>>)Parameters["Encoding"]; }
43    }
44
45    public ILookupParameter<DoubleValue> QualityParameter {
46      get { return (ILookupParameter<DoubleValue>)Parameters["Quality"]; }
47    }
48
49    public ILookupParameter<DoubleValue> MoveQualityParameter {
50      get { return (ILookupParameter<DoubleValue>)Parameters["MoveQuality"]; }
51    }
52
53    public Action<ISingleObjectiveSolutionContext<TEncodedSolution>, IRandom, CancellationToken> Evaluate { get; set; }
54
55    [StorableConstructor]
56    private SingleObjectiveMoveEvaluator(StorableConstructorFlag _) : base(_) { }
57    private SingleObjectiveMoveEvaluator(SingleObjectiveMoveEvaluator<TEncodedSolution> original, Cloner cloner) : base(original, cloner) { }
58    public SingleObjectiveMoveEvaluator() {
59      Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator to use."));
60      Parameters.Add(new LookupParameter<IEncoding<TEncodedSolution>>("Encoding", "An item that holds the problem's encoding."));
61      Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The quality of the parameter vector."));
62      Parameters.Add(new LookupParameter<DoubleValue>("MoveQuality", "The quality of the move."));
63    }
64
65    public override IDeepCloneable Clone(Cloner cloner) {
66      return new SingleObjectiveMoveEvaluator<TEncodedSolution>(this, cloner);
67    }
68
69    public override IOperation Apply() {
70      var random = RandomParameter.ActualValue;
71      var encoding = EncodingParameter.ActualValue;
72      var solutionContext = ScopeUtil.CreateSolutionContext(ExecutionContext.Scope, encoding);
73
74      if (!solutionContext.IsEvaluated)
75        Evaluate(solutionContext, random, CancellationToken.None);
76      var qualityValue = solutionContext.EvaluationResult.Quality;
77
78      MoveQualityParameter.ActualValue = new DoubleValue(qualityValue);
79      ScopeUtil.CopyToScope(ExecutionContext.Scope, solutionContext);
80      return base.Apply();
81    }
82  }
83}
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