GitLab

* MBART: support summarization tasks

* fix test

* Style

* add tokenizer test

Huge MT speedup!

Co-authored-by: Pradhy729 <49659913+Pradhy729@users.noreply.github.com>

Co-authored-by: Sam Shleifer <sshleifer@gmail.com>

improve unittests for finetuning, especially w.r.t testing frozen parameters
fix freeze_embeds for T5
add streamlit setup.cfg

* Fix the bug 'Attempted relative import with no known parent package' when using the bertabs example. Also change the used model from bertabs-finetuned-cnndm, since it seems not be accessible anymore

* Update run_summarization.py
Co-authored-by: Kevin Canwen Xu <canwenxu@126.com>

* all save_pretrained methods mkdir if not os.path.exists

* remove references to old API in docstring - update data processors

* style

* fix tests - better type checking error messages

* better type checking

* include awesome fix by @LysandreJik for #5310

* updated doc and examples