[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>

docs/source/internal/trainer_utils.rst

@@ -1,4 +1,4 @@
-.. 
+..
     Copyright 2020 The HuggingFace Team. All rights reserved.
 
     Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
@@ -46,3 +46,9 @@ Distributed Evaluation
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 .. autoclass:: transformers.HfArgumentParser
+
+
+Debug Utilities
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. autoclass:: transformers.debug_utils.DebugUnderflowOverflow