Changeset 6438

Timestamp:

06/17/11 13:30:51 (13 years ago)

Author:

gkronber

Message:

#1506 fixed a bug in the simplifier view for symbolic DF classification solutions.

File:

• trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic.Classification.Views/3.4/InteractiveSymbolicDiscriminantFunctionClassificationSolutionSimplifierView.cs (modified) (2 diffs)

trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic.Classification.Views/3.4/InteractiveSymbolicDiscriminantFunctionClassificationSolutionSimplifierView.cs

@@ -51 +51 @@
     protected override void UpdateModel(ISymbolicExpressionTree tree) {
       Content.Model = new SymbolicDiscriminantFunctionClassificationModel(tree, Content.Model.Interpreter);
+      // the default policy for setting thresholds in classification models is the accuarcy maximizing policy
+      // however for performance reasons we must use estimations of the normal distribution cut points as the thresholds
+      // here and in CalculateImpactValues as they are a lot faster to calculate
+      Content.SetClassDistibutionCutPointThresholds();
     }
 
@@ -75 +79 @@
       double[] classValues;
       double[] thresholds;
+      // normal distribution cut points are used as thresholds here because they are a lot faster to calculate than the accuracy maximizing thresholds
       NormalDistributionCutPointsThresholdCalculator.CalculateThresholds(Content.ProblemData, originalOutput, targetClassValues, out classValues, out thresholds);
       var classifier = new SymbolicDiscriminantFunctionClassificationModel(tree, interpreter);