Error: Too many levels in unordered categorical variable. Only 63 levels allowed on this system. Ranger will EXIT now.

[Datou0718]

Hi, I'm new to ranger and encountered this problem in cpp_version. One of the columns col_1 is unordered with a relatively high dimension(131), I set col_1 to catvar and resulted in the following error, "Error: Too many levels in unordered categorical variable col_1. Only 63 levels allowed on this system. Ranger will EXIT now.". I've searched for solutions but it seems that this should work fine(#146 says this is version issue, but my ranger version is 0.16.2). I have no idea how to fix it😢.

[mnwright]

The "order" splitrule is unfortunately only implemented in the R version. The pure C++ version uses "partition" splitting which has the 63 level limit.

[Datou0718]

Thank you for answering! I have another question, is it possible to use class_weights with C++ or only case_weights supported?

[mnwright]

Hmpf yes, you found another feature that didn't make it to the pure C++ version. ☹️