ROOT.TMVA in columnflow

[JulesVandenbroeck]

Hi everyone,

I was trying to create a calibrator that uses ROOT.TMVA to calculate lepton mva scores and store them (to use at selection stage). This was done before with xgboost but the weights for 2022 are .xml files that were produced using ROOT.TMVA. I found no way to create a virtual environment (using sandboxes) in which ROOT is installed so instead I opted for a virtual environment that uses CMSSW_12_6_2 (default). In here however I get the issue gfal2 is not installed which is required for columnflow/modules/law/law/contrib/gfal/target.py. Is there a possibility to add additional packages to the virtual environment that are orginaly not in cmssw? In case not, is there another way to include ROOT into a virtual environment sandbox?

Kind Regards,

Jules Vandenbroeck