[debug utils] activation/weights underflow/overflow detector (#11274)

* sync

* add activation overflow debug utility

* cleanup

* document detect_overflow

* import torch

* add deprecation warning

* Apply suggestions from code review

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

* convert to rst, add note

* add class

* fix docs

* improve the doc

* rework to dump a lot more info about each frame

* complete expansion

* cleanup

* format

* cleanup

* doesn't have to be transformers

* Apply suggestions from code review

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

* wrap long line

* style

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

src/transformers/tokenization_utils_base.py

@@ -3154,7 +3154,7 @@ class PreTrainedTokenizerBase(SpecialTokensMixin, PushToHubMixin):
 
     def _eventual_warn_about_too_long_sequence(self, ids: List[int], max_length: Optional[int], verbose: bool):
         """
-        Depending on the input and internal state we might trigger a warning about a sequence that is too long for it's
+        Depending on the input and internal state we might trigger a warning about a sequence that is too long for its
         corresponding model
 
         Args: