Changeset 16086 for trunk/HeuristicLab.Algorithms.DataAnalysis/3.4/NearestNeighbour/NearestNeighbourModel.cs

Timestamp:

08/23/18 09:56:09 (20 months ago)

Author:

bwerth

Message:

#2941 added divion-by-zero check to scaling

File:

• trunk/HeuristicLab.Algorithms.DataAnalysis/3.4/NearestNeighbour/NearestNeighbourModel.cs (modified) (1 diff)

trunk/HeuristicLab.Algorithms.DataAnalysis/3.4/NearestNeighbour/NearestNeighbourModel.cs

@@ -130 +130 @@
           // automatic determination of weights (all features should have variance = 1)
           this.weights = this.allowedInputVariables
-            .Select(name => 1.0 / dataset.GetDoubleValues(name, rows).StandardDeviationPop())
+            .Select(name => {
+              var pop = dataset.GetDoubleValues(name, rows).StandardDeviationPop();
+              return  pop.IsAlmost(0) ? 1.0 : 1.0/pop;
+            })
             .Concat(new double[] { 1.0 }) // no scaling for target variable
             .ToArray();