source: branches/1614_GeneralizedQAP/HeuristicLab.Problems.GeneralizedQuadraticAssignment.Algorithms/3.3/CPLEX/CplexSolver.cs @ 15700

Last change on this file since 15700 was 15700, checked in by abeham, 3 years ago

#1614:

  • Changed performance measure to stopwatch instead of datetime for precision reasons
File size: 4.1 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2017 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 HeuristicLab.Common;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Encodings.IntegerVectorEncoding;
28using HeuristicLab.Optimization;
29using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
30using ILOG.CPLEX;
31using ILOG.OPL;
32
33namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Algorithms.CPLEX {
34  [Item("CPLEX Solver (GQAP)", "Base class")]
35  [StorableClass]
36  public abstract class CplexSolver : ContextAlgorithm<CplexContext, IntegerVectorEncoding> {
37    public override bool SupportsPause {
38      get { return false; }
39    }
40
41    public override Type ProblemType {
42      get { return typeof(GQAP); }
43    }
44
45    public new GQAP Problem {
46      get { return (GQAP)base.Problem; }
47      set { base.Problem = value; }
48    }
49
50    [StorableConstructor]
51    protected CplexSolver(bool deserializing) : base(deserializing) { }
52    protected CplexSolver(CplexSolver original, Cloner cloner)
53    : base(original, cloner) {
54    }
55    public CplexSolver() {
56      Problem = new GQAP();
57    }
58
59    protected override void Run(CancellationToken cancellationToken) {
60      base.Run(cancellationToken);
61      var factory = new OplFactory();
62      var cplex = factory.CreateCplex();
63      cplex.Use(new LogCallback(this, cancellationToken));
64      cplex.SetParam(Cplex.DoubleParam.TiLim, MaximumRuntime.TotalSeconds);
65      var dataSource = new GQAPDataSource(factory, Problem.ProblemInstance);
66      using (var settings = factory.CreateOplSettings(factory.CreateOplErrorHandler()))
67      using (var opl = GetModel(factory, settings, cplex)) {
68        opl.AddDataSource(dataSource);
69        opl.Generate();
70        cplex.Solve();
71        cplex.End();
72      }
73      Context.RunOperator(Analyzer, CancellationToken.None);
74    }
75
76    protected abstract OplModel GetModel(OplFactory factory, OplSettings settings, Cplex cplex);
77  }
78
79  public class LogCallback : Cplex.MIPInfoCallback {
80    private CplexSolver algorithm;
81    private CancellationToken token;
82    private double prev;
83
84
85    public LogCallback(CplexSolver algorithm, CancellationToken token) {
86      this.algorithm = algorithm;
87      this.token = token;
88      prev = double.NaN;
89    }
90
91    protected override void Main() {
92      if (HasIncumbent()) {
93        var val = GetIncumbentObjValue();
94        if (val >= prev) return;
95        algorithm.Context.Iterations++;
96        algorithm.Context.BestQuality = val;
97        IResult result;
98        if (algorithm.Results.TryGetValue("Iterations", out result))
99          ((IntValue)result.Value).Value = algorithm.Context.Iterations;
100        else algorithm.Results.Add(new Result("Iterations", new IntValue(algorithm.Context.Iterations)));
101        if (algorithm.Results.TryGetValue("BestQuality", out result))
102          ((DoubleValue)result.Value).Value = algorithm.Context.BestQuality;
103        else algorithm.Results.Add(new Result("BestQuality", new DoubleValue(algorithm.Context.BestQuality)));
104        algorithm.Context.RunOperator(algorithm.Analyzer, CancellationToken.None);
105        prev = val;
106        if (val.IsAlmost(algorithm.Problem.BestKnownQuality))
107          Abort();
108      }
109      if (token.IsCancellationRequested) Abort();
110    }
111  }
112}
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