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* move the helper code into testing_utils

* port test_trainer_distributed to work with pytest

* improve docs

* simplify notes

* doc

* doc

* style

* doc

* further improvements

* torch might not be available

* real fix

* Apply suggestions from code review
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

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

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

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

Co-authored-by: Swetha Mandava <smandava@nvidia.com>

* save hostname

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

* broken test

* batch parity

* tests pass

* boom boom

* boom boom

* split out bart tokenizer tests

* fix tests

* boom boom

* Fixed dataset bug

* Fix marian

* Undo extra

* Get marian working

* Fix t5 tok tests

* Test passing

* Cleanup

* better assert msg

* require torch

* Fix mbart tests

* undo extra decoder_attn_mask change

* Fix import

* pegasus tokenizer can ignore src_lang kwargs

* unused kwarg test cov

* boom boom

* add todo for pegasus issue

* cover one word translation edge case

* Cleanup

* doc

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* MBART: support summarization tasks

* fix test

* Style

* add tokenizer test

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

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

* 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