Steps missing from "adding model" documentation?

[amueller]

Hey! It looks to me like there might be some steps missing for adding a model. It seems that it needs to be added to tabzilla_alg_handler.py, which is not mentioned in the docs. It's not quite clear whether that's in addition to adding it to str2model in models/__init__.py as the two seem somewhat redundant. I didn't see TabPFN in the models/__init__.py so I assume that's not used any more?