Feature weights hist handler issue 2328 - Fix docstring (#2547)

* Remove unnecessary code in BaseOutputHandler

Closes #2438

* Add ReduceLROnPlateauScheduler

Closes #1754

* Fix indentation issue

* Fix another indentation issue

* Fix PEP8 related issues

* Fix other PEP8 related issues

* Fix hopefully the last PEP8 related issue

* Fix hopefully the last PEP8 related issue

* Remove ReduceLROnPlateau's specific params and add link to it

Also fix bug in min_lr check

* Fix state_dict bug and add a test

* Update docs

* Add doctest and fix typo

* Add feature FixedWeightsHistHandler

Closes #2328

* Move FixedWeightsHistHandler's job to WeightsHistHandler

Closes #2328

* Enable whitelist to be callable

* autopep8 fix

* Refactor constructor

* Change whitelist to be List[str]

* Add whitelist callable type

* Fix bug in MNIST tensorboard example

* Fix docstring

* Update ignite/contrib/handlers/tensorboard_logger.py

Co-authored-by: vfdev <[email protected]>
Co-authored-by: sadra-barikbin <[email protected]>

Author: sadra-barikbin

Diff for: ignite/contrib/handlers/tensorboard_logger.py

@@ -459,6 +459,9 @@ class WeightsHistHandler(BaseWeightsHistHandler):
                 event_name=Events.ITERATION_COMPLETED,
                 log_handler=WeightsHistHandler(model, whitelist=weight_selector)
             )
+
+    ..  versionchanged:: 0.5.0
+        optional argument `whitelist` added.
     """
 
     def __init__(