GitLab

* add MBartForConditionalGeneration

* style

* rebase and fixes

* add mbart test in TEST_FILES_WITH_NO_COMMON_TESTS

* fix docs

* don't ignore mbart

* doc

* fix mbart fairseq link

* put mbart before bart

* apply doc suggestions

Co-authored-by: Jingqing  Zhang <jingqing.zhang15@imperial.ac.uk>

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

* Clean documentation

* 🐛 Fix model ids for BART and Flaubert

- MarianSentencepieceTokenizer - > MarianTokenizer
- Start using unk token.
- add docs page
- add better generation params to MarianConfig
- more conversion utilities

* improved documentation

`generate` code that produces 99% identical summarizations to fairseq on CNN test data, with caching.

* Results same as fairseq
* Wrote a ton of tests
* Struggled with api signatures
* added some docs