[8346] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[12018] | 3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[8346] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using HeuristicLab.Common;
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| 24 | using HeuristicLab.Core;
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| 25 | using HeuristicLab.Data;
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| 26 | using HeuristicLab.Optimization;
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| 27 | using HeuristicLab.Parameters;
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| 28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 29 | using HeuristicLab.Problems.VehicleRouting.Encodings;
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| 30 | using HeuristicLab.Problems.VehicleRouting.Encodings.Potvin;
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| 31 | using HeuristicLab.Problems.VehicleRouting.Interfaces;
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| 32 | using HeuristicLab.Problems.VehicleRouting.Variants;
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| 33 |
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| 34 | namespace HeuristicLab.Problems.VehicleRouting {
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| 35 | /// <summary>
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[8894] | 36 | /// A base class for operators which improve VRP solutions.
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[8346] | 37 | /// </summary>
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[8894] | 38 | [Item("VRPImprovementOperator", "A base class for operators which improve VRP solutions.")]
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[8346] | 39 | [StorableClass]
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[8894] | 40 | public abstract class VRPImprovementOperator : VRPOperator, IGeneralVRPOperator, ISingleObjectiveImprovementOperator {
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[8346] | 41 | #region Parameter properties
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| 42 | public ScopeParameter CurrentScopeParameter {
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| 43 | get { return (ScopeParameter)Parameters["CurrentScope"]; }
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| 44 | }
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| 45 | public IValueParameter<IntValue> ImprovementAttemptsParameter {
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| 46 | get { return (IValueParameter<IntValue>)Parameters["ImprovementAttempts"]; }
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| 47 | }
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[8894] | 48 | public IValueLookupParameter<IntValue> LocalEvaluatedSolutions {
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| 49 | get { return (IValueLookupParameter<IntValue>)Parameters["LocalEvaluatedSolutions"]; }
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[8346] | 50 | }
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| 51 | public ILookupParameter<IRandom> RandomParameter {
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| 52 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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| 53 | }
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| 54 | public IValueParameter<IntValue> SampleSizeParameter {
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| 55 | get { return (IValueParameter<IntValue>)Parameters["SampleSize"]; }
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| 56 | }
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| 57 | public IValueLookupParameter<IItem> SolutionParameter {
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| 58 | get { return (IValueLookupParameter<IItem>)Parameters["Solution"]; }
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| 59 | }
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| 60 | #endregion
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| 61 |
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| 62 | [StorableConstructor]
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[8894] | 63 | protected VRPImprovementOperator(bool deserializing) : base(deserializing) { }
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| 64 | protected VRPImprovementOperator(VRPImprovementOperator original, Cloner cloner) : base(original, cloner) { }
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| 65 | protected VRPImprovementOperator()
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[8346] | 66 | : base() {
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| 67 | #region Create parameters
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| 68 | Parameters.Add(new ScopeParameter("CurrentScope", "The current scope that contains the solution to be improved."));
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| 69 | Parameters.Add(new ValueParameter<IntValue>("ImprovementAttempts", "The number of improvement attempts the operator should perform.", new IntValue(100)));
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[8894] | 70 | Parameters.Add(new ValueLookupParameter<IntValue>("LocalEvaluatedSolutions", "The number of evaluated solutions."));
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[8346] | 71 | Parameters.Add(new LookupParameter<IRandom>("Random", "A pseudo random number generator."));
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[8894] | 72 | Parameters.Add(new ValueParameter<IntValue>("SampleSize", "The number of moves that should be executed.", new IntValue(25)));
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[8346] | 73 | Parameters.Add(new ValueLookupParameter<IItem>("Solution", "The solution to be improved. This parameter is used for name translation only."));
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| 74 | #endregion
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| 75 | }
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| 76 |
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[10298] | 77 | public override IOperation InstrumentedApply() {
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[8894] | 78 | var solution = SolutionParameter.ActualValue as IVRPEncoding;
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| 79 | var potvinSolution = solution is PotvinEncoding ? solution as PotvinEncoding : PotvinEncoding.ConvertFrom(solution, ProblemInstance);
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[8346] | 80 |
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| 81 | if (solution == null)
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| 82 | throw new ArgumentException("Cannot improve solution because it has the wrong type.");
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| 83 |
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[8894] | 84 | int evaluatedSolutions = Improve(potvinSolution);
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[8346] | 85 |
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[8894] | 86 | SolutionParameter.ActualValue = solution;
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| 87 | LocalEvaluatedSolutions.ActualValue = new IntValue(evaluatedSolutions);
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[8346] | 88 |
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[10298] | 89 | return base.InstrumentedApply();
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[8346] | 90 | }
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[8894] | 91 |
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| 92 | protected abstract int Improve(PotvinEncoding solution);
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[8346] | 93 | }
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| 94 | }
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