[PyTorch] Update docs/example and benchmarks/ scripts

[cyanguwa]

Description

This PR updates the attention Jupyter Notebook and some of the scripts related to it in docs/example/attention and benchmarks/attention.

• docs/example/attention/attention.ipynb
• docs/example/attention/example_attention.py
• docs/example/attention/arbitrary_mask_to_post_scale_bias.py
• benchmarks/attention/benchmark_attention.py

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:

• Update attention tutorial and docs/example and benchmarks/ scripts

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

[cyanguwa]

/te-ci pytorch