Remove _attn_implementation in LlamaBidirectionalModel constructor

[oliverholworthy]

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What does this PR do ?

Remove setting of _attn_implementation in the LlamaBidirectionalModel constructor.

The eager implementation is not as memory efficient as the sdpa implementation (which is selected by default) and encounters OOM errors when calibrating the model during quantization with long sequences (~3000 tokens) on a GPU with 48GB memory.

Removing this line enable the sdpa attention implementation to be used by default.
The choice of attention implementation can be changed by providing the attn_implementation parameter to the model when loaded with the from_pretrained method.

Collection: llm

Changelog

• Remove setting of _attn_implementation in the LlamaBidirectionalModel constructor.

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[akoumpa]

Hi @oliverholworthy , can you signoff your commit and push again?

To add your Signed-off-by line to every commit in this branch:

Ensure you have a local copy of your branch by [checking out the pull request locally via command line](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/checking-out-pull-requests-locally).
In your local branch, run: `git rebase HEAD~1 --signoff`
Force push your changes to overwrite the branch: `git push --force-with-lease origin oholworthy/embedding-attn-implementation`

Apologies for the trouble, but it's needed for CI. Thank you.

[akoumpa]

CC @suiyoubi

[oliverholworthy]

@akoumpa I've added the signoff line to the commit and updated the branch

[suiyoubi]

Thanks for updating this!