Different dimension for attention

[pggPL]

Description

I added channels_per_head parameter to attention. I know that it is breaking change, but I think there is not a good way of doing it - look at the discussion in https://github.com/NVIDIA/TransformerEngine/pull/731

Fixes # (issue)

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)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Changes

Please list the changes introduced in this PR:

• Added channels_per_head parameter to attention,
• Added simple unit test, I don't know if its necessary

Checklist:

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

[pggPL]

But this tutorial mode change is good. Should I remove it and add to the new PR?

[sudhakarsingh27]

/te-ci pytorch

[ksivaman]

/te-ci pytorch

[sudhakarsingh27]

/te-ci pytorch

[sudhakarsingh27]

Why change the file permission for the tutorial?

It seems like we mistakenly changed the permission last time so I think we're reverting it back. Is that okay or do we need to create a separate fix for it?

[sudhakarsingh27]

/te-ci pytorch