Refactor: switch GradScaler import from torch.cuda.amp to torch.amp #3437
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Fixes #3435
Description:
I have made change in code from torch.cuda.amp import GradScaler to from torch.amp import GradScaler.
• torch.amp provides a unified AMP interface across devices.
• Using torch.cuda.amp restricts AMP usage to CUDA-only environments.
• This change helps Ignite better support PyTorch’s full AMP ecosystem in a clean and future-proof way.
No new functionality added — this is a safe refactor with no effect on runtime behavior.