[PyTorch] Improve logging/messaging in attention

[cyanguwa]

Description

This PR

• separates TE logging from upstream application's logging, if we are both using the logging package
• improves the messaging in check_set_window_size to avoid warning when window_size is within the correct range
• removes logging in fwd/bwd to reduce CPU overhead because they're called every iteration

Fixes #1064 and #1065.

Type of change

• Documentation change (change only to the documentation, either a fix or a new content)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Infra/Build change
• Code refractor

Changes

Please list the changes introduced in this PR:

• separates TE logging from upstream application's logging, if we are both using the logging package
• improves the messaging in check_set_window_size to avoid warning when window_size is within the correct range
• removes logging in fwd/bwd to reduce CPU overhead because they're called every iteration

Checklist:

• I have read and followed the contributing guidelines
• The functionality is complete
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[cyanguwa]

/te-ci pytorch

[Marks101]

Hi @cyanguwa, I just tested these changes and the logging is good now. Really great to have the possibility to enable logging for the attention backend selection now. This helps a lot!

Thanks for processing this so super quick! :D

[cyanguwa]

@Marks101 No worries! Would you be able to test the changes related to check_set_window_size as well? Thanks.

[Marks101]

I already tested the warnings as well. All good from our side 👍

[cyanguwa]

/te-ci pytorch

[ksivaman]

LGTM