Improved docs for Loggers (#1484)

* improve __init__

* improve logger base

* improve comet logger docs

* improved docs for mlflow

* improved nepune logger docs

* fix matplotlib import issue

* improve tensorboard docs

* improve docs for test tube

* improved trains logger docs

* improve wandb logger docs

* improved docs in experiment_logging.rst

* added MLflow to the list of loggers

* fix too long lines

* fix trains doctest

* fix neptune doctest

* fix mlflow doctest

* Apply suggestions from code review

Co-Authored-By: Jirka Borovec <Borda@users.noreply.github.com>

* Apply suggestions from code review

* fix whitespace

* try bypass mode for neptune (fix doctest api key error)

* try "test" as api key

* Revert "try "test" as api key"

This reverts commit fd77db26d551f08b4b4a12bb93cbd8f7a0814f29.

* try test as api key

* update neptune docs

* bump neptune minimal version

* revert unnecessary bypass code

* test if CI runs doctests in .rst files

* Revert "test if CI runs doctests in .rst files"

This reverts commit a45aeb460a8c4b7445a35dd7b49265f48d11c485.

* add doctest directive

* neptune demo links

* added tutorial link for W&B

* fix line too long

* fix merge error

* fix merge error

* add instructions how to install loggers

* add instructions how to install the loggers

* hide _abc_impl property from docs

* review Borda, 4 spaces

* indentation in example sections

* blank

Co-authored-by: Jirka Borovec <Borda@users.noreply.github.com>

docs/source/conf.py

@@ -385,7 +385,7 @@ autodoc_default_options = {
     'methods': None,
     # 'attributes': None,
     'special-members': '__call__',
-    # 'exclude-members': '__weakref__',
+    'exclude-members': '_abc_impl',
     'show-inheritance': True,
     'private-members': True,
     'noindex': True,