source: trunk/sources/HeuristicLab.Algorithms.NSGA2/3.3/RankAndCrowdingSorter.cs @ 4068

#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 <http://www.gnu.org/licenses/>.
 */
#endregion

using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Operators;
using HeuristicLab.Parameters;
using HeuristicLab.Selection;

namespace HeuristicLab.Algorithms.NSGA2 {
  public class RankAndCrowdingSorter : AlgorithmOperator {
    public ValueLookupParameter<BoolArray> MaximizationParameter {
      get { return (ValueLookupParameter<BoolArray>)Parameters["Maximization"]; }
    }
    public ScopeTreeLookupParameter<DoubleArray> QualitiesParameter {
      get { return (ScopeTreeLookupParameter<DoubleArray>)Parameters["Qualities"]; }
    }
    public ScopeTreeLookupParameter<IntValue> RankParameter {
      get { return (ScopeTreeLookupParameter<IntValue>)Parameters["Rank"]; }
    }
    public ScopeTreeLookupParameter<DoubleValue> CrowdingDistanceParameter {
      get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["CrowdingDistance"]; }
    }

    public RankAndCrowdingSorter()
      : base() {
      Parameters.Add(new ValueLookupParameter<BoolArray>("Maximization", "For each objective a value that is true if that objective should be maximized, or false if it should be minimized."));
      Parameters.Add(new ScopeTreeLookupParameter<DoubleArray>("Qualities", "The vector of quality values."));
      Parameters.Add(new ScopeTreeLookupParameter<IntValue>("Rank", "The rank of a solution (to which front it belongs)."));
      Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("CrowdingDistance", "The crowding distance of a solution in a population."));

      FastNonDominatedSort fastNonDominatedSort = new FastNonDominatedSort();
      UniformSubScopesProcessor subScopesProcessor = new UniformSubScopesProcessor();
      CrowdingDistanceAssignment crowdingDistanceAssignment = new CrowdingDistanceAssignment();
      CrowdedComparisonSorter crowdedComparisonSorter = new CrowdedComparisonSorter();
      MergingReducer mergingReducer = new MergingReducer();

      fastNonDominatedSort.MaximizationParameter.ActualName = MaximizationParameter.Name;
      fastNonDominatedSort.QualitiesParameter.ActualName = QualitiesParameter.Name;
      fastNonDominatedSort.RankParameter.ActualName = RankParameter.Name;

      crowdingDistanceAssignment.CrowdingDistanceParameter.ActualName = CrowdingDistanceParameter.Name;
      crowdingDistanceAssignment.QualitiesParameter.ActualName = QualitiesParameter.Name;

      crowdedComparisonSorter.CrowdingDistanceParameter.ActualName = CrowdingDistanceParameter.Name;
      crowdedComparisonSorter.RankParameter.ActualName = RankParameter.Name;

      OperatorGraph.InitialOperator = fastNonDominatedSort;
      fastNonDominatedSort.Successor = subScopesProcessor;
      subScopesProcessor.Operator = crowdingDistanceAssignment;
      crowdingDistanceAssignment.Successor = crowdedComparisonSorter;
      crowdedComparisonSorter.Successor = null;
      subScopesProcessor.Successor = mergingReducer;
      mergingReducer.Successor = null;
    }
  }
}