How to get different variable rankings for TMVA BDTG

I am currently training a BDTG with k-fold cross-validation. After all the folds are trained, I am able to get an input variable ranking that uses ‘Separation’ as the metric:

                         : Ranking input variables (method unspecific)...
IdTransformation         : Ranking result (top variable is best ranked)
                         : --------------------------------------------------
                         : Rank : Variable                  : Separation
                         : --------------------------------------------------

I have seen both in the TMVA Users Guide and in some other Root Forum examples (e.g. https://root-forum.cern.ch/t/the-rank-of-variables/28339) that other metrics are available, one being ‘Variable Importance.’ How do we switch between different types of rankings? Is there some option to do this?

Thanks!
Thomas

Hi Thomas,

Thanks for the post.
Let me add @moneta in the loop.

Cheers,
D