Fix tapas scatter

[Bearnardd]

What does this PR do?

Changes the usage of scatter from torch_scatter to PyTorch's scatter thus removing the dependency on third party library

• remove torch_scatter dependency
• update _segment_reduce function in order to work with PyTorch's scatter
• update test case test_reduce_sum_vectorized

Fixes # (issue)
#20101

Who can review?

@NielsRogge

[HuggingFaceDocBuilderDev]

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[NielsRogge]

Thanks a lot for fixing!

Could you also remove all "scatter" mentions in the code base? https://github.com/search?q=repo%3Ahuggingface%2Ftransformers%20scatter&type=code

[ydshieh]

Thanks

[ydshieh]

Thank you again, @Bearnardd !

[sgugger]

Thanks a lot for migrating to PyTorch!
Could you just remove the file src/transformers/utils/dummy_scatter_objects.py as it won't be necessary anymore.

[Bearnardd]

Hi @sgugger - Sure, I will remove it as a part of removing all "scatter" mentions requested by @NielsRogge.

[Bearnardd]

Hi @NielsRogge - could you tell me what is the difference between require_scatter and require_torch_scatter in transformers/src/transformers/testing_utils.py since they are calling the same thing.

[NielsRogge]

Good question, you can remove both ;)

[Bearnardd]

@NielsRogge - I have removed "scatter" mentions from the code base. It will be good to double check the changes :). I have not changed .circleci/create_circleci_config.py since removing it is a part of the #20168 PR.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[sgugger]

Thanks for all the work! Will rebase my PR on yours to finish the job :-)