source: trunk/sources/HeuristicLab.Problems.DataAnalysis.Regression/3.3/SupportVectorRegression/SupportVectorRegressionSolution.cs @ 5991

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2011 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 System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Problems.DataAnalysis.SupportVectorMachine;
using SVM;

namespace HeuristicLab.Problems.DataAnalysis.Regression.SupportVectorRegression {
  /// <summary>
  /// Represents a support vector solution for a regression problem which can be visualized in the GUI.
  /// </summary>
  [Item("SupportVectorRegressionSolution", "Represents a support vector solution for a regression problem which can be visualized in the GUI.")]
  [StorableClass]
  public sealed class SupportVectorRegressionSolution : DataAnalysisSolution {
    public override Image ItemImage {
      get { return HeuristicLab.Common.Resources.VSImageLibrary.Function; }
    }

    public new SupportVectorMachineModel Model {
      get { return (SupportVectorMachineModel)base.Model; }
      set { base.Model = value; }
    }

    private List<double> estimatedValues;
    public override IEnumerable<double> EstimatedValues {
      get {
        if (estimatedValues == null) RecalculateEstimatedValues();
        return estimatedValues;
      }
    }

    public override IEnumerable<double> EstimatedTrainingValues {
      get {
        return GetEstimatedValues(ProblemData.TrainingIndizes);
      }
    }

    public override IEnumerable<double> EstimatedTestValues {
      get {
        return GetEstimatedValues(ProblemData.TestIndizes);
      }
    }

    public Dataset SupportVectors {
      get {
        int nCol = inputVariables.Count;
        double[,] data = new double[Model.Model.SupportVectorCount, nCol];
        int row = 0;
        foreach (var sv in Model.SupportVectors) {
          for (int col = 0; col < nCol; col++) {
            data[row, col] = sv[col];
          }
          row++;
        }
        return new Dataset(inputVariables, data);
      }
    }

    [Storable]
    private List<string> inputVariables;

    [StorableConstructor]
    private SupportVectorRegressionSolution(bool deserializing) : base(deserializing) { }
    private SupportVectorRegressionSolution(SupportVectorRegressionSolution original, Cloner cloner)
      : base(original, cloner) {
      this.inputVariables = new List<string>(original.inputVariables);
    }
    public SupportVectorRegressionSolution() : base() { }
    public SupportVectorRegressionSolution(DataAnalysisProblemData problemData, SupportVectorMachineModel model, IEnumerable<string> inputVariables, double lowerEstimationLimit, double upperEstimationLimit)
      : base(problemData, lowerEstimationLimit, upperEstimationLimit) {
      this.Model = model;
      this.inputVariables = new List<string>(inputVariables);
    }

    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      #region backwards compatibility
      if (inputVariables == null) inputVariables = ProblemData.InputVariables.CheckedItems.Select(x => x.Value.Value).ToList();
      #endregion
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new SupportVectorRegressionSolution(this, cloner);
    }

    protected override void RecalculateEstimatedValues() {
      SVM.Problem problem = SupportVectorMachineUtil.CreateSvmProblem(ProblemData, Enumerable.Range(0, ProblemData.Dataset.Rows));
      SVM.Problem scaledProblem = Scaling.Scale(Model.RangeTransform, problem);

      estimatedValues = (from row in Enumerable.Range(0, scaledProblem.Count)
                         let prediction = SVM.Prediction.Predict(Model.Model, scaledProblem.X[row])
                         let boundedX = Math.Min(UpperEstimationLimit, Math.Max(LowerEstimationLimit, prediction))
                         select double.IsNaN(boundedX) ? UpperEstimationLimit : boundedX).ToList();
      OnEstimatedValuesChanged();
    }


    private IEnumerable<double> GetEstimatedValues(IEnumerable<int> rows) {
      if (estimatedValues == null) RecalculateEstimatedValues();
      foreach (int row in rows)
        yield return estimatedValues[row];
    }
  }
}