GitLab

* add test in trainer and test tokenizer saving wi
th trainer

* quality

* reverse trainer changes

* replace test in test_trainer by a test for all the tokenizers

* format

* add can_save_slow_tokenizer attribute to all tokenizers

* fix Herbert

* format

* Change comment in error

* add comments and a new assert

* Update src/transformers/models/albert/tokenization_albert_fast.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* change ValueError barthez

* change ValueError BigBird

* change ValueError Camembert

* change ValueError Mbart50

* change ValueError Pegasus

* change ValueError ReFormer

* change ValueError T5

* change ValueError RoBERTa

* XLNET fast

* Update tests/test_tokenization_common.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* change `assert` into `self.assertIn`

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