#region License Information
/* HeuristicLab
* Copyright (C) 2002-2016 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.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Operators;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
namespace HeuristicLab.Optimization.Operators {
///
/// FastNonDominatedSort as described in: Deb, Pratap, Agrawal and Meyarivan, "A Fast and Elitist Multiobjective
/// Genetic Algorithm: NSGA-II", IEEE Transactions On Evolutionary Computation, Vol. 6, No. 2, April 2002
///
[Item("FastNonDominatedSort", @"FastNonDominatedSort as described in: Deb, Pratap, Agrawal and Meyarivan, ""A Fast and Elitist Multiobjective
Genetic Algorithm: NSGA-II"", IEEE Transactions On Evolutionary Computation, Vol. 6, No. 2, April 2002")]
[StorableClass]
public class FastNonDominatedSort : SingleSuccessorOperator, IMultiObjectiveOperator {
#region Parameter properties
public IValueLookupParameter MaximizationParameter {
get { return (IValueLookupParameter)Parameters["Maximization"]; }
}
public IValueLookupParameter DominateOnEqualQualitiesParameter {
get { return (ValueLookupParameter)Parameters["DominateOnEqualQualities"]; }
}
public IScopeTreeLookupParameter QualitiesParameter {
get { return (IScopeTreeLookupParameter)Parameters["Qualities"]; }
}
public IScopeTreeLookupParameter RankParameter {
get { return (IScopeTreeLookupParameter)Parameters["Rank"]; }
}
#endregion
[StorableConstructor]
protected FastNonDominatedSort(bool deserializing) : base(deserializing) { }
protected FastNonDominatedSort(FastNonDominatedSort original, Cloner cloner) : base(original, cloner) { }
public FastNonDominatedSort() {
Parameters.Add(new ValueLookupParameter("Maximization", "Whether each objective is maximization or minimization."));
Parameters.Add(new ValueLookupParameter("DominateOnEqualQualities", "Flag which determines wether solutions with equal quality values should be treated as dominated."));
Parameters.Add(new ScopeTreeLookupParameter("Qualities", "The qualities of a solution.", 1));
Parameters.Add(new ScopeTreeLookupParameter("Rank", "The rank of a solution.", 1));
}
public override IOperation Apply() {
bool dominateOnEqualQualities = DominateOnEqualQualitiesParameter.ActualValue.Value;
bool[] maximization = MaximizationParameter.ActualValue.ToArray();
double[][] qualities = QualitiesParameter.ActualValue.Select(x => x.ToArray()).ToArray();
if (qualities == null) throw new InvalidOperationException(Name + ": No qualities found.");
IScope scope = ExecutionContext.Scope;
int populationSize = scope.SubScopes.Count;
int[] rank;
var fronts = DominationCalculator.CalculateAllParetoFronts(scope.SubScopes.ToArray(), qualities, maximization, out rank, dominateOnEqualQualities);
RankParameter.ActualValue = new ItemArray(rank.Select(x => new IntValue(x)));
scope.SubScopes.Clear();
for (var i = 0; i < fronts.Count; i++) {
Scope frontScope = new Scope("Front " + i);
foreach (var p in fronts[i])
frontScope.SubScopes.Add(p.Item1);
if (frontScope.SubScopes.Count > 0)
scope.SubScopes.Add(frontScope);
}
return base.Apply();
}
public override IDeepCloneable Clone(Cloner cloner) {
return new FastNonDominatedSort(this, cloner);
}
[StorableHook(HookType.AfterDeserialization)]
private void AfterDeserialization() {
// BackwardsCompatibility3.3
#region Backwards compatible code, remove with 3.4
if (!Parameters.ContainsKey("DominateOnEqualQualities"))
Parameters.Add(new ValueLookupParameter("DominateOnEqualQualities", "Flag which determines wether solutions with equal quality values should be treated as dominated."));
#endregion
}
}
}