Added Token classification for Udop

[nileshkokane01]

What does this PR do?

Fixes #29800

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Who can review?

@NielsRogge

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[nileshkokane01]

@NielsRogge ,
Adding to all_model_classes causes 10 errors. Any hint ?
As of now I have commented UdopForTokenClassification .

[amyeroberts]

Hi @nileshkokane01, thanks for opening a PR! Are there checkpoints available for this task-specific model? We tend to reserve these additions to situations when this is the case

[nileshkokane01]

Guess not. Not official ones at least to my sight.

The original Issue was inspired from the example code of @NielsRogge .
(https://github.com/NielsRogge/Transformers-Tutorials/blob/master/UDOP%2FFine_tune_UDOPEncoderModel_on_FUNSD_%28HuggingFace_Trainer%29.ipynb)

He may have a better idea as to why it was a "Good first issue”, or could perhaps point to an available checkpoint.

[amyeroberts]

@nileshkokane01 OK, thanks for clarifying. I've removed the label. In this case, we won't merge in. We can leave this PR as a reference in case anyone in the community would like to see how to add it in their own code :)