source: branches/2521_ProblemRefactoring/HeuristicLab.Problems.Programmable/3.3/Templates/SingleObjectiveCombinedEncodingProblem_Template.cs @ 17381

using System;
using System.Linq;
using System.Collections.Generic;
using System.Threading;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Optimization;
using HeuristicLab.Encodings.BinaryVectorEncoding;
using HeuristicLab.Encodings.IntegerVectorEncoding;
using HeuristicLab.Encodings.RealVectorEncoding;
using HeuristicLab.Encodings.PermutationEncoding;
using HeuristicLab.Encodings.LinearLinkageEncoding;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;

namespace HeuristicLab.Problems.Programmable {
  public class CompiledSingleObjectiveProblemDefinition : CompiledSingleObjectiveProblemDefinition<CombinedEncoding, CombinedSolution> {
    public override bool Maximization { get { return true; } }

    public override void Initialize() {
      // Use vars.yourVariable to access variables in the variable store i.e. yourVariable
      // Define e.g. the length of the solution encoding or the solution creator by modifying the Encoding property
      // Add additional initialization code e.g. private variables that you need for evaluating
      Encoding.Add(new BinaryVectorEncoding("b") { Length = 10 });
      //Encoding.Add(new IntegerVectorEncoding("i") { Length = 10, Bounds = new IntMatrix(new int[,] { { -100, 100 } }) });
      Encoding.Add(new RealVectorEncoding("r") { Length = 10, Bounds = new DoubleMatrix(new double[,] { { -100, 100 } }) });
      //Encoding.Add(new PermutationEncoding("p") { Length = 20, Type = PermutationTypes.Absolute });
      //Encoding.Add(new LinearLinkageEncoding("lle") { Length = 30 });
    }

    public override double Evaluate(CombinedSolution solution, IRandom random, CancellationToken cancellationToken) {
      // Use vars.yourVariable to access variables in the variable store i.e. yourVariable
      var quality = 0.0;
      var b = solution.GetEncodedSolution<BinaryVector>("b");
      quality = b.Count(x => x); // one max!
      var r = solution.GetEncodedSolution<RealVector>("r");
      quality += r.Sum(x => -x * x); // sphere

      // NOTE: Check the Maximization property above (true or false)!
      return quality;
    }

    public override void Analyze(CombinedSolution[] solutions, double[] qualities, ResultCollection results, IRandom random) {
      // Use vars.yourVariable to access variables in the variable store i.e. yourVariable
      // Write or update results given the range of vectors and resulting qualities
      // Uncomment the following lines if you want to retrieve the best solution

      //var orderedSolutions = solutions.Zip(qualities, (i, q) => new { Solution = i, Quality = q }).OrderBy(z => z.Quality);
      //var best = Maximization ? orderedSolutions.Last().Solution : orderedSolutions.First().Solution;

      //if (!results.ContainsKey("Best Solution")) {
      //  results.Add(new Result("Best Solution", typeof(CombinedSolution)));
      //}
      //results["Best Solution"].Value = (IItem)best.Clone();
    }

    public override IEnumerable<CombinedSolution> GetNeighbors(CombinedSolution solution, IRandom random) {
      // Use vars.yourVariable to access variables in the variable store i.e. yourVariable
      // Create new vectors, based on the given one that represent small changes
      // This method is only called from move-based algorithms (Local Search, Simulated Annealing, etc.)
      while (true) {
        // Algorithm will draw only a finite amount of samples
        // Change to a for-loop to return a concrete amount of neighbors
        var neighbor = (CombinedSolution)solution.Clone();
        // modify the solution specified as neighbor
        yield return neighbor;
      }
    }

    // Implement further classes and methods
  }
}