Also you can check out these https://github.com/bentoml/BentoML/blob/master/bentoml/frameworks/sklearn.py, https://github.com/bentoml/BentoML/blob/master/bentoml/frameworks/xgboost.py I'm assuming xlearn has similar APIs as sklearn. if it is maybe you can get some ideas about implementation from these existing examples.

the original Artifact class is here https://github.com/bentoml/BentoML/blob/master/bentoml/service/artifacts/__init__.py

Also it would be great if you can implement xlearn and contribute it back. would really help others who r using the same lib, feel free to post your issue here 😄