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Ignore:
Timestamp:
12/19/18 14:56:54 (6 years ago)
Author:
msemenki
Message:

#2942: Add for KNN-Regression/Classification ability to utilize data points with zero distance to the query point. Alteration in the way weights are assigned to neighboring points (to except division-by-zero).

Location:
branches/2942_KNNRegressionClassification
Files:
1 added
5 edited
1 copied

Legend:

Unmodified
Added
Removed

  • branches/2942_KNNRegressionClassification/HeuristicLab.Algorithms.DataAnalysis/3.4/HeuristicLab.Algorithms.DataAnalysis-3.4.csproj

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  • branches/2942_KNNRegressionClassification/HeuristicLab.Algorithms.DataAnalysis/3.4/Nca/NcaModel.cs

    r15869 r16408  
    6565
    6666      var ds = ReduceDataset(dataset, rows);
    67       nnModel = new NearestNeighbourModel(ds, Enumerable.Range(0, ds.Rows), k, ds.VariableNames.Last(), ds.VariableNames.Take(transformationMatrix.GetLength(1)), classValues: classValues);
     67      nnModel = new NearestNeighbourModel(ds, Enumerable.Range(0, ds.Rows), k, false,  ds.VariableNames.Last(), ds.VariableNames.Take(transformationMatrix.GetLength(1)), classValues: classValues);
    6868    }
    6969

  • branches/2942_KNNRegressionClassification/HeuristicLab.Algorithms.DataAnalysis/3.4/NearestNeighbour/NearestNeighbourClassification.cs

    r15583 r16408  
    1 #region License Information
     1#region License Information
    22/* HeuristicLab
    33 * Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
    … …  
    4242    private const string NearestNeighbourClassificationModelResultName = "Nearest neighbour classification solution";
    4343    private const string WeightsParameterName = "Weights";
    44 
     44    private const string SelfMatchParameterName = "SelfMatch";
    4545
    4646    #region parameter properties
    4747    public IFixedValueParameter<IntValue> KParameter {
    4848      get { return (IFixedValueParameter<IntValue>)Parameters[KParameterName]; }
     49    }
     50    public IFixedValueParameter<BoolValue> SelfMatchParameter {
     51      get { return (IFixedValueParameter<BoolValue>)Parameters[SelfMatchParameterName]; }
    4952    }
    5053    public IValueParameter<DoubleArray> WeightsParameter {
    … …  
    5356    #endregion
    5457    #region properties
     58    public bool SelfMatch {
     59      get { return SelfMatchParameter.Value.Value; }
     60      set { SelfMatchParameter.Value.Value = value; }
     61    }
    5562    public int K {
    5663      get { return KParameter.Value.Value; }
    … …  
    7380    public NearestNeighbourClassification()
    7481      : base() {
     82      Parameters.Add(new FixedValueParameter<BoolValue>(SelfMatchParameterName, "Should we use equal points for classification?", new BoolValue(false)));
    7583      Parameters.Add(new FixedValueParameter<IntValue>(KParameterName, "The number of nearest neighbours to consider for regression.", new IntValue(3)));
    7684      Parameters.Add(new OptionalValueParameter<DoubleArray>(WeightsParameterName, "Optional: use weights to specify individual scaling values for all features. If not set the weights are calculated automatically (each feature is scaled to unit variance)"));
    … …  
    95103      double[] weights = null;
    96104      if (Weights != null) weights = Weights.CloneAsArray();
    97       var solution = CreateNearestNeighbourClassificationSolution(Problem.ProblemData, K, weights);
     105      var solution = CreateNearestNeighbourClassificationSolution(Problem.ProblemData, K, SelfMatch, weights);
    98106      Results.Add(new Result(NearestNeighbourClassificationModelResultName, "The nearest neighbour classification solution.", solution));
    99107    }
    100108
    101     public static IClassificationSolution CreateNearestNeighbourClassificationSolution(IClassificationProblemData problemData, int k, double[] weights = null) {
     109    public static IClassificationSolution CreateNearestNeighbourClassificationSolution(IClassificationProblemData problemData, int k, bool selfMatch = false, double[] weights = null) {
    102110      var problemDataClone = (IClassificationProblemData)problemData.Clone();
    103       return new NearestNeighbourClassificationSolution(Train(problemDataClone, k, weights), problemDataClone);
     111      return new NearestNeighbourClassificationSolution(Train(problemDataClone, k, selfMatch, weights), problemDataClone);
    104112    }
    105113
    106     public static INearestNeighbourModel Train(IClassificationProblemData problemData, int k, double[] weights = null) {
     114    public static INearestNeighbourModel Train(IClassificationProblemData problemData, int k, bool selfMatch = false, double[] weights = null) {
    107115      return new NearestNeighbourModel(problemData.Dataset,
    108116        problemData.TrainingIndices,
    109117        k,
     118        selfMatch,
    110119        problemData.TargetVariable,
    111120        problemData.AllowedInputVariables,

  • branches/2942_KNNRegressionClassification/HeuristicLab.Algorithms.DataAnalysis/3.4/NearestNeighbour/NearestNeighbourModel.cs

    r16243 r16408  
    1 #region License Information
     1#region License Information
    22/* HeuristicLab
    33 * Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
    … …  
    3737
    3838    private readonly object kdTreeLockObject = new object();
     39
    3940    private alglib.nearestneighbor.kdtree kdTree;
    4041    public alglib.nearestneighbor.kdtree KDTree {
    … …  
    6061    [Storable]
    6162    private int k;
     63    [Storable]
     64    private bool selfMatch;
    6265    [Storable(DefaultValue = null)]
    6366    private double[] weights; // not set for old versions loaded from disk
    … …  
    97100      kdTree.x = (double[])original.kdTree.x.Clone();
    98101      kdTree.xy = (double[,])original.kdTree.xy.Clone();
    99 
     102      selfMatch = original.selfMatch;
    100103      k = original.k;
    101104      isCompatibilityLoaded = original.IsCompatibilityLoaded;
    … …  
    110113        this.classValues = (double[])original.classValues.Clone();
    111114    }
    112     public NearestNeighbourModel(IDataset dataset, IEnumerable<int> rows, int k, string targetVariable, IEnumerable<string> allowedInputVariables, IEnumerable<double> weights = null, double[] classValues = null)
     115    public NearestNeighbourModel(IDataset dataset, IEnumerable<int> rows, int k, bool selfMatch, string targetVariable, IEnumerable<string> allowedInputVariables, IEnumerable<double> weights = null, double[] classValues = null)
    113116      : base(targetVariable) {
    114117      Name = ItemName;
    115118      Description = ItemDescription;
     119      this.selfMatch = selfMatch;
    116120      this.k = k;
    117121      this.allowedInputVariables = allowedInputVariables.ToArray();
    … …  
    132136            .Select(name => {
    133137              var pop = dataset.GetDoubleValues(name, rows).StandardDeviationPop();
    134               return  pop.IsAlmost(0) ? 1.0 : 1.0/pop;
     138              return pop.IsAlmost(0) ? 1.0 : 1.0 / pop;
    135139            })
    136140            .Concat(new double[] { 1.0 }) // no scaling for target variable
    … …  
    201205        int numNeighbours;
    202206        lock (kdTreeLockObject) { // gkronber: the following calls change the kdTree data structure
    203           numNeighbours = alglib.nearestneighbor.kdtreequeryknn(kdTree, x, k, false);
     207          numNeighbours = alglib.nearestneighbor.kdtreequeryknn(kdTree, x, k, selfMatch);
    204208          alglib.nearestneighbor.kdtreequeryresultsdistances(kdTree, ref dists);
    205209          alglib.nearestneighbor.kdtreequeryresultsxy(kdTree, ref neighbours);
    206210        }
    207 
     211        if (selfMatch) {
     212          double minDist = dists[0] + 1;
     213          for (int i = 0; i < numNeighbours; i++) {
     214            if ((minDist > dists[i]) && (dists[i] != 0)) {
     215              minDist = dists[i];
     216            }
     217          }
     218          minDist /= 100.0;
     219          for (int i = 0; i < numNeighbours; i++) {
     220            if (dists[i] == 0) {
     221              dists[i] = minDist;
     222            }
     223          }
     224        }
    208225        double distanceWeightedValue = 0.0;
    209226        double distsSum = 0.0;
    … …  
    238255        lock (kdTreeLockObject) {
    239256          // gkronber: the following calls change the kdTree data structure
    240           numNeighbours = alglib.nearestneighbor.kdtreequeryknn(kdTree, x, k, false);
     257          numNeighbours = alglib.nearestneighbor.kdtreequeryknn(kdTree, x, k, selfMatch);
    241258          alglib.nearestneighbor.kdtreequeryresultsdistances(kdTree, ref dists);
    242259          alglib.nearestneighbor.kdtreequeryresultsxy(kdTree, ref neighbours);

  • branches/2942_KNNRegressionClassification/HeuristicLab.Algorithms.DataAnalysis/3.4/NearestNeighbour/NearestNeighbourRegression.cs

    r15583 r16408  
    4141    private const string NearestNeighbourRegressionModelResultName = "Nearest neighbour regression solution";
    4242    private const string WeightsParameterName = "Weights";
     43    private const string SelfMatchParameterName = "SelfMatch";
    4344
    4445    #region parameter properties
    … …  
    4647      get { return (IFixedValueParameter<IntValue>)Parameters[KParameterName]; }
    4748    }
    48 
     49    public IFixedValueParameter<BoolValue> SelfMatchParameter {
     50      get { return (IFixedValueParameter<BoolValue>)Parameters[SelfMatchParameterName]; }
     51    }
    4952    public IValueParameter<DoubleArray> WeightsParameter {
    5053      get { return (IValueParameter<DoubleArray>)Parameters[WeightsParameterName]; }
    … …  
    5962      }
    6063    }
    61 
     64    public bool SelfMatch {
     65      get { return SelfMatchParameter.Value.Value; }
     66      set { SelfMatchParameter.Value.Value = value; }
     67    }
    6268    public DoubleArray Weights {
    6369      get { return WeightsParameter.Value; }
    … …  
    7581      Parameters.Add(new FixedValueParameter<IntValue>(KParameterName, "The number of nearest neighbours to consider for regression.", new IntValue(3)));
    7682      Parameters.Add(new OptionalValueParameter<DoubleArray>(WeightsParameterName, "Optional: use weights to specify individual scaling values for all features. If not set the weights are calculated automatically (each feature is scaled to unit variance)"));
     83      Parameters.Add(new FixedValueParameter<BoolValue>(SelfMatchParameterName, "Should we use equal points for classification?", new BoolValue(false)));
    7784      Problem = new RegressionProblem();
    7885    }
    … …  
    96103      double[] weights = null;
    97104      if (Weights != null) weights = Weights.CloneAsArray();
    98       var solution = CreateNearestNeighbourRegressionSolution(Problem.ProblemData, K, weights);
     105      var solution = CreateNearestNeighbourRegressionSolution(Problem.ProblemData, K, SelfMatch, weights);
    99106      Results.Add(new Result(NearestNeighbourRegressionModelResultName, "The nearest neighbour regression solution.", solution));
    100107    }
    101108
    102     public static IRegressionSolution CreateNearestNeighbourRegressionSolution(IRegressionProblemData problemData, int k, double[] weights = null) {
     109    public static IRegressionSolution CreateNearestNeighbourRegressionSolution(IRegressionProblemData problemData, int k, bool selfMatch = false, double[] weights = null) {
    103110      var clonedProblemData = (IRegressionProblemData)problemData.Clone();
    104       return new NearestNeighbourRegressionSolution(Train(problemData, k, weights), clonedProblemData);
     111      return new NearestNeighbourRegressionSolution(Train(problemData, k, selfMatch, weights), clonedProblemData);
    105112    }
    106113
    107     public static INearestNeighbourModel Train(IRegressionProblemData problemData, int k, double[] weights = null) {
     114    public static INearestNeighbourModel Train(IRegressionProblemData problemData, int k, bool selfMatch = false, double[] weights = null) {
    108115      return new NearestNeighbourModel(problemData.Dataset,
    109116        problemData.TrainingIndices,
    110117        k,
     118        selfMatch,
    111119        problemData.TargetVariable,
    112120        problemData.AllowedInputVariables,
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