Bump torch requirement to 2
Author: oraluben
Pull request: yes

# What does this PR do?

Follow-up of #35358

@ydshieh @ArthurZucker @muellerzr

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Comments:
Thank you @oraluben . We don't (usually) need to pin torch version explicitly, but this makes sense to me.

Could you run `make style` to fix the CI? (if not working, try `make fixuup`)

@ArthurZucker Are you ok with the pin?

You are right, good point!

Let's go with this PR and see if there are still cases where some dependencies will require torch < 2 and fail `transformers` installation after this pin here.





> Makes sense, but I think we juste deprecated in a soft manner. A lot of stuff should still work with 1.3! Up to you. @ydshieh

Some model rely on `torch.compile` and won't work with torch<2 (e.g. `ModernBertEmbeddings` if you search for `@torch.compile`). I was trying to fix those issues by https://github.com/huggingface/transformers/pull/35478 but just found `is_torch_greater_or_equal_than_2_0` has been removed. AFAICT the only significant difference between 1 and 2 is torch dynamo and it should be easy to work around.

> Let's go with this PR and see if there are still cases where some dependencies will require torch < 2 and fail `transformers` installation after this pin here.

It should be fine if specific user wants to use torch<2 with latest transformers, most models should work with a pip warning (install torch<2 after install latest transformers)

> It should be fine if specific user wants to use torch<2 with latest transformers, most models should work with a pip warning (install torch<2 after install latest transformers)

Right! I am talking more in an automated process, and although a change in steps may work, it also probably means breaking some existing process and then a fix for it