Repository: huggingface/transformers
Pull request: don't use no_sync when deepspeed doesn't support it for certain zero stages

# What does this PR do?
Deepspeed 0.16 has assertions preventing the use of no_sync with zero 2/3. see https://github.com/microsoft/DeepSpeed/blob/master/deepspeed/runtime/engine.py#L1986-L2004

it seems people are reporting this here https://github.com/microsoft/DeepSpeed/issues/6793, and I'm assuming that everyone is using accelerate/transformers as downgrading to deepspeed 0.15.4 makes it "work" for them.

## Before submitting
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- [ ] Did you write any new necessary tests?


## Who can review?

@muellerzr 

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

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Changed files:
filename: src/transformers/trainer.py
patch: @@ -2517,6 +2517,7 @@ def _inner_training_loop(
                     context = (
                         functools.partial(self.accelerator.no_sync, model=model)
                         if i != len(batch_samples) - 1
+                        and self.accelerator.distributed_type != DistributedType.DEEPSPEED
                         else contextlib.nullcontext
                     )
                     with context():