Migration guide from v3.x to v4.x (#8763)
Migration guide from v3.x to v4.x (#8763)

* Migration guide from v3.x to v4.x

* Better wording

* Apply suggestions from code review

Co-authored-by: Sylvain Gugger <222c4d44cc8ec39802c192ed0aa3f97cdb77ff4e@users.noreply.github.com>

* Sylvain's comments

* Better wording.

Co-authored-by: Sylvain Gugger <222c4d44cc8ec39802c192ed0aa3f97cdb77ff4e@users.noreply.github.com>
huggingface/transformers,huggingface/pytorch-transformers,huggingface/transformers,huggingface/transformers,huggingface/transformers