#region License Information /* HeuristicLab * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL) * * This file is part of HeuristicLab. * * HeuristicLab is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * HeuristicLab is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with HeuristicLab. If not, see . */ #endregion using System; using System.Collections.Generic; using System.Linq; using HeuristicLab.Core; using HeuristicLab.Data; using HeuristicLab.Optimization; using HeuristicLab.Operators; using HeuristicLab.Optimization.Operators; using HeuristicLab.Parameters; using HeuristicLab.Persistence.Default.CompositeSerializers.Storable; using HeuristicLab.PluginInfrastructure; namespace HeuristicLab.Algorithms.LocalSearch { [Item("Local Search", "A local search algorithm.")] [Creatable("Algorithms")] [StorableClass] public sealed class LocalSearch : EngineAlgorithm { #region Problem Properties public override Type ProblemType { get { return typeof(ISingleObjectiveProblem); } } public new ISingleObjectiveProblem Problem { get { return (ISingleObjectiveProblem)base.Problem; } set { base.Problem = value; } } #endregion #region Parameter Properties private ValueParameter SeedParameter { get { return (ValueParameter)Parameters["Seed"]; } } private ValueParameter SetSeedRandomlyParameter { get { return (ValueParameter)Parameters["SetSeedRandomly"]; } } private ConstrainedValueParameter MoveGeneratorParameter { get { return (ConstrainedValueParameter)Parameters["MoveGenerator"]; } } private ConstrainedValueParameter MoveMakerParameter { get { return (ConstrainedValueParameter)Parameters["MoveMaker"]; } } private ConstrainedValueParameter MoveEvaluatorParameter { get { return (ConstrainedValueParameter)Parameters["MoveEvaluator"]; } } private ValueParameter MaximumIterationsParameter { get { return (ValueParameter)Parameters["MaximumIterations"]; } } private ValueParameter SampleSizeParameter { get { return (ValueParameter)Parameters["SampleSize"]; } } #endregion #region Properties public IntValue Seed { get { return SeedParameter.Value; } set { SeedParameter.Value = value; } } public BoolValue SetSeedRandomly { get { return SetSeedRandomlyParameter.Value; } set { SetSeedRandomlyParameter.Value = value; } } public IMoveGenerator MoveGenerator { get { return MoveGeneratorParameter.Value; } set { MoveGeneratorParameter.Value = value; } } public IMoveMaker MoveMaker { get { return MoveMakerParameter.Value; } set { MoveMakerParameter.Value = value; } } public ISingleObjectiveMoveEvaluator MoveEvaluator { get { return MoveEvaluatorParameter.Value; } set { MoveEvaluatorParameter.Value = value; } } public IntValue MaximumIterations { get { return MaximumIterationsParameter.Value; } set { MaximumIterationsParameter.Value = value; } } public IntValue SampleSize { get { return SampleSizeParameter.Value; } set { SampleSizeParameter.Value = value; } } private RandomCreator RandomCreator { get { return (RandomCreator)OperatorGraph.InitialOperator; } } private SolutionsCreator SolutionsCreator { get { return (SolutionsCreator)RandomCreator.Successor; } } private LocalSearchMainLoop MainLoop { get { return (LocalSearchMainLoop)SolutionsCreator.Successor; } } #endregion public LocalSearch() : base() { Parameters.Add(new ValueParameter("Seed", "The random seed used to initialize the new pseudo random number generator.", new IntValue(0))); Parameters.Add(new ValueParameter("SetSeedRandomly", "True if the random seed should be set to a random value, otherwise false.", new BoolValue(true))); Parameters.Add(new ConstrainedValueParameter("MoveGenerator", "The operator used to generate moves to the neighborhood of the current solution.")); Parameters.Add(new ConstrainedValueParameter("MoveMaker", "The operator used to perform a move.")); Parameters.Add(new ConstrainedValueParameter("MoveEvaluator", "The operator used to evaluate a move.")); Parameters.Add(new ValueParameter("MaximumIterations", "The maximum number of generations which should be processed.", new IntValue(1000))); Parameters.Add(new ValueParameter("SampleSize", "Number of moves that MultiMoveGenerators should create. This is ignored for Exhaustive- and SingleMoveGenerators.", new IntValue(100))); RandomCreator randomCreator = new RandomCreator(); SolutionsCreator solutionsCreator = new SolutionsCreator(); LocalSearchMainLoop lsMainLoop = new LocalSearchMainLoop(); OperatorGraph.InitialOperator = randomCreator; randomCreator.RandomParameter.ActualName = "Random"; randomCreator.SeedParameter.ActualName = SeedParameter.Name; randomCreator.SeedParameter.Value = null; randomCreator.SetSeedRandomlyParameter.ActualName = SetSeedRandomlyParameter.Name; randomCreator.SetSeedRandomlyParameter.Value = null; randomCreator.Successor = solutionsCreator; solutionsCreator.NumberOfSolutions = new IntValue(1); solutionsCreator.Successor = lsMainLoop; lsMainLoop.MoveGeneratorParameter.ActualName = MoveGeneratorParameter.Name; lsMainLoop.MoveMakerParameter.ActualName = MoveMakerParameter.Name; lsMainLoop.MoveEvaluatorParameter.ActualName = MoveEvaluatorParameter.Name; lsMainLoop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name; lsMainLoop.RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName; lsMainLoop.ResultsParameter.ActualName = "Results"; Initialize(); } [StorableConstructor] private LocalSearch(bool deserializing) : base(deserializing) { } public override IDeepCloneable Clone(Cloner cloner) { LocalSearch clone = (LocalSearch)base.Clone(cloner); clone.Initialize(); return clone; } public override void Prepare() { if (Problem != null && MoveGenerator != null && MoveMaker != null && MoveEvaluator != null) base.Prepare(); } #region Events protected override void OnProblemChanged() { ParameterizeStochasticOperator(Problem.SolutionCreator); ParameterizeStochasticOperator(Problem.Evaluator); foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op); foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType()) { op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged); } ParameterizeSolutionsCreator(); ParameterizeMainLoop(); ParameterizeMoveEvaluators(); ParameterizeMoveMakers(); UpdateMoveGenerator(); UpdateMoveParameters(); Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged); base.OnProblemChanged(); } protected override void Problem_SolutionCreatorChanged(object sender, EventArgs e) { ParameterizeStochasticOperator(Problem.SolutionCreator); ParameterizeSolutionsCreator(); base.Problem_SolutionCreatorChanged(sender, e); } protected override void Problem_EvaluatorChanged(object sender, EventArgs e) { ParameterizeStochasticOperator(Problem.Evaluator); ParameterizeSolutionsCreator(); ParameterizeMainLoop(); ParameterizeMoveEvaluators(); ParameterizeMoveMakers(); Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged); base.Problem_EvaluatorChanged(sender, e); } protected override void Problem_VisualizerChanged(object sender, EventArgs e) { ParameterizeStochasticOperator(Problem.Visualizer); ParameterizeMainLoop(); if (Problem.Visualizer != null) Problem.Visualizer.VisualizationParameter.ActualNameChanged += new EventHandler(Visualizer_VisualizationParameter_ActualNameChanged); base.Problem_VisualizerChanged(sender, e); } protected override void Problem_OperatorsChanged(object sender, EventArgs e) { foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op); // This may seem pointless, but some operators already have the eventhandler registered, others don't // FIXME: Is there another way to solve this problem? foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType()) { op.MoveQualityParameter.ActualNameChanged -= new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged); op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged); } UpdateMoveGenerator(); UpdateMoveParameters(); ParameterizeMainLoop(); ParameterizeMoveEvaluators(); ParameterizeMoveMakers(); base.Problem_OperatorsChanged(sender, e); } private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) { ParameterizeMainLoop(); ParameterizeMoveEvaluators(); ParameterizeMoveMakers(); } private void MoveGeneratorParameter_ValueChanged(object sender, EventArgs e) { UpdateMoveParameters(); } private void MoveEvaluatorParameter_ValueChanged(object sender, EventArgs e) { ParameterizeMainLoop(); ParameterizeMoveEvaluators(); ParameterizeMoveMakers(); } private void MoveEvaluator_MoveQualityParameter_ActualNameChanged(object sender, EventArgs e) { ParameterizeMainLoop(); ParameterizeMoveEvaluators(); ParameterizeMoveMakers(); } private void Visualizer_VisualizationParameter_ActualNameChanged(object sender, EventArgs e) { ParameterizeMainLoop(); } #endregion #region Helpers [StorableHook(HookType.AfterDeserialization)] private void Initialize() { if (Problem != null) { Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged); foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType()) { op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged); } } MoveGeneratorParameter.ValueChanged += new EventHandler(MoveGeneratorParameter_ValueChanged); MoveEvaluatorParameter.ValueChanged += new EventHandler(MoveEvaluatorParameter_ValueChanged); } private void UpdateMoveGenerator() { IMoveGenerator oldMoveGenerator = MoveGenerator; MoveGeneratorParameter.ValidValues.Clear(); if (Problem != null) { foreach (IMoveGenerator generator in Problem.Operators.OfType().OrderBy(x => x.Name)) MoveGeneratorParameter.ValidValues.Add(generator); } if (oldMoveGenerator != null) { IMoveGenerator newMoveGenerator = MoveGeneratorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveGenerator.GetType()); if (newMoveGenerator != null) MoveGenerator = newMoveGenerator; } if (MoveGenerator == null) { ClearMoveParameters(); } } private void UpdateMoveParameters() { IMoveMaker oldMoveMaker = MoveMaker; ISingleObjectiveMoveEvaluator oldMoveEvaluator = MoveEvaluator; ClearMoveParameters(); if (MoveGenerator != null) { List moveTypes = MoveGenerator.GetType().GetInterfaces().Where(x => typeof(IMoveOperator).IsAssignableFrom(x)).ToList(); foreach (Type type in moveTypes.ToList()) { if (moveTypes.Any(t => t != type && type.IsAssignableFrom(t))) moveTypes.Remove(type); } foreach (Type type in moveTypes) { var operators = Problem.Operators.Where(x => type.IsAssignableFrom(x.GetType())).OrderBy(x => x.Name); foreach (IMoveMaker moveMaker in operators.OfType()) MoveMakerParameter.ValidValues.Add(moveMaker); foreach (ISingleObjectiveMoveEvaluator moveEvaluator in operators.OfType()) MoveEvaluatorParameter.ValidValues.Add(moveEvaluator); } if (oldMoveMaker != null) { IMoveMaker mm = MoveMakerParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveMaker.GetType()); if (mm != null) MoveMaker = mm; } if (oldMoveEvaluator != null) { ISingleObjectiveMoveEvaluator me = MoveEvaluatorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveEvaluator.GetType()); if (me != null) MoveEvaluator = me; } } } private void ClearMoveParameters() { MoveMakerParameter.ValidValues.Clear(); MoveEvaluatorParameter.ValidValues.Clear(); } private void ParameterizeSolutionsCreator() { SolutionsCreator.EvaluatorParameter.ActualName = Problem.EvaluatorParameter.Name; SolutionsCreator.SolutionCreatorParameter.ActualName = Problem.SolutionCreatorParameter.Name; } private void ParameterizeMainLoop() { MainLoop.BestKnownQualityParameter.ActualName = Problem.BestKnownQualityParameter.Name; MainLoop.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name; MainLoop.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName; if (MoveEvaluator != null) MainLoop.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName; MainLoop.VisualizerParameter.ActualName = Problem.VisualizerParameter.Name; if (Problem.Visualizer != null) MainLoop.VisualizationParameter.ActualName = Problem.Visualizer.VisualizationParameter.ActualName; } private void ParameterizeStochasticOperator(IOperator op) { if (op is IStochasticOperator) ((IStochasticOperator)op).RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName; } private void ParameterizeMoveEvaluators() { foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType()) { op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName; } } private void ParameterizeMoveMakers() { foreach (IMoveMaker op in Problem.Operators.OfType()) { op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName; if (MoveEvaluator != null) op.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName; } } #endregion } }