Get the bit array indicating the value subset in case of split on a categorical variable.
The rule is: if var_value in subset then next_node<-left else next_node<-right
Namespace: Emgu.CV.ML.StructureAssembly: Emgu.CV.ML (in Emgu.CV.ML.dll) Version: 2.2.1.1150 (2.2.1.1150)