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Fix bug in txt to ROOT file conversion for lightGBM training for MVAUtils

Ruggero Turra requested to merge turra/athena:fix_mvautils_xgboost_converted_xentropy_alias into master

This is a fix for a small bug when converting a txt file (the output of a lightGBM training) to ROOT (the input for MVAUtils package). The problem is that lightGBM is using many aliases for the same objective.

It is quite important to port this also in 21.2. Let me know if this cannot be done automatically. By the way before this fix the tool prompts a warning about the different output between lightGBM and MVAUtils.

@hteagle: can you fix the xgboost one? it should be affected by the same problem, see ATLASRECTS-5775

Edited by Ruggero Turra

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