Replace torch.cuda.amp.autocast with torch.amp.autocast('cuda',...)

[vfdev-5]

Fix the warning:

 FutureWarning: `torch.cuda.amp.autocast(args...)` is deprecated. Please use `torch.amp.autocast('cuda', args...)` instead.

by replacing everywhere in the codebase:

- torch.cuda.amp.autocast(...
+ torch.amp.autocast("cuda", ...

[github-actions]

Hey 👋, I've just created a thread for this issue on PyTorch-Ignite Discord where you can quickly talk to the community on the topic.

^{🤖 This comment was automatically posted by Discuss on Discord}

[Gulin7]

Hi, @vfdev-5 , could you please assign me to this issue?

[vfdev-5]

@Gulin7 you can start working on it

[Gulin7]

@vfdev-5 I searched for the use of torch.cuda.amp.autocast(... and found nothing, except a reference in some mock tests.

[vfdev-5]

You should search for autocast, for example:
https://github.com/pytorch/ignite/blob/master/ignite/engine/__init__.py#L188

[Gulin7]

@vfdev-5 I made a PR, I'm waiting for feedback.