Modernize logger interface

[emmanuel-ferdman]

What does this PR do ?

The logger.warn() method is deprecated since Python2.7 and replaced with logger.warning(). It leads to those warnings:

DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead

Also, in retro_dataset.py it uses from nemo.utils import logging which does not even have .warn method available, meaning this is a bug.

Collection: asr, common, nlp.

Changelog

Modernize logger interface

Usage

• You can potentially add a usage example below

from nemo.utils import logging
logging.warn("test is a test")

import logging
logging.warn("test is a test")

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• Bugfix
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Additional Information

• Related to # (issue)

[stevehuang52]

LGTM, thanks!

[emmanuel-ferdman]

@stevehuang52 looks like the CI complains on not-related linting issues in the same file. What should be done in this case?

[stevehuang52]

@stevehuang52 looks like the CI complains on not-related linting issues in the same file. What should be done in this case?

No worries, I got this