Support for newer versions of XGBoost

[Ponewor]

Something has changed in XGBoost model's binary format. The highest versions I've managed to make leaves work with is 1.0. Starting from 1.1+ I keep getting "panic: unexpected EOF". Is support for newer versions planned?
Moreover, they've started to save models in JSON format and it looks like they're going to deprecate binaries altogether.

[nikolaydubina]

Same error here with XGB 1.3.3. This fails.

Size is too large here:

@dmitryikh, I think format for XGB binary changed.

[nikolaydubina]

Might be better to add support for JSON? https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html