Change unpacking of TF layoutlm inputs to use decorator

[vumichien]

What does this PR do?

As part of #16051 this PR changes the unpacking of the inputs of TF layoutlm to use the decorator instead.

Fixes # (issue)

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@Rocketknight1 @gante

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[gante]

Fantastic, thank you so much! I have the same comments as in the other PR:

1. Tests are failing due to formatting -- make fixup should fix it
2. Can you confirm that RUN_SLOW=1 py.test -vv tests/[model_name]/test_modeling_tf_[model_name].py runs?
3. Sorry to be picky about this -- other models have been adding @unpack_inputs as the top decorator, can I ask you to move it to the top (for consistency)?

Finally, one of the models you touched is RAG, whose tests are suuuuuper slow (like 1hr slow, needing >16GB of RAM) -- let me know if you want me to run the tests 🙏

[vumichien]

Yah, I agree Rag's test is suppper slow :( . Anyway, let me run all the tests again and I will commit when they are done

[gante]

Yah, I agree Rag's test is suppper slow :( . Anyway, let me run all the tests again and I will commit when they are done

I'm assuming all tests have passed, since you've made a commit -- is this correct? :D

[vumichien]

Yeah, all the test have passed :D