varlen attention tutorial

[liangel-02]

This PR is a tutorial for a variable length attention API

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3660

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As of commit af7fe97f790eb542ff77b6bab62df3bab216d87b with merge base 63e3575c8b077fb8eded4348ccdb41b0e9bc965b (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[drisspg]

@svekars any tips for reviewing this code in a more human friendly way?

[svekars]

There is more info here: https://github.com/pytorch/tutorials#contributing and there is a script that will help you convert your .ipynb to .py

[svekars]

There is also an error here: https://github.com/pytorch/tutorials/actions/runs/19864783846/job/56924391840?pr=3660#step:9:4582 - let me check how should we test against 2.10.

[svekars]

@AlannaBurke can you please review this 2.10 tutorial.

[svekars]

Nightly preview: https://docs-preview.pytorch.org/pytorch/tutorials-nightly-preview/3660/intermediate/variable_length_attention_tutorial.html

[AlannaBurke]

looks great, make sure you've resolved all of @svekars 's comments

[liangel-02]

looks great, make sure you've resolved all of @svekars 's comments

yep resolved