Patching clip model to create mask tensor on the device
Author: shanmugamr1992
Pull request: yes

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Comments:
_The documentation is not available anymore as the PR was closed or merged._

@shanmugamr1992 Thanks for opening this PR! 

For the quality tests to pass, you'll need to run `make fixup` locally and commit any formatting changes that were applied. There were some recent updates to our formatting libraries, so you might need to run `pip install -e .["quality"]` to ensure that you have the up-to-date settings. 

Could you add this update to the other implementations of `_build_causal_attention_mask` for pytorch models in the repo too please? 

The main idea is to reduce host and device syncs

@amyeroberts  Could you verify and merge it please thanks .

@shanmugamr1992  Thanks again for your contribution and updating. I think just a final rebase / fix conflicts as there were some recent updates on the docs on `main`, then we're good to merge :) 

@amyeroberts  All done. Thanks a lot for the wonderful suggestions.