Calling cuda() with async results in SyntaxError

There was an async parameter but it was deprecated now, because async became a reserved word in Python 3.7. Details are included in this issue rename .cuda(async=..) parameters. You can use non_blocking as an alternative.

Your code does not work because:

• async is a reserved keyword in python which cannot be used in that way, that is why you get the SyntaxError

• cuda() no longer has an argument async. The constructor looks like this:

cuda(device=None, non_blocking=False) → Tensor

• Previously there was an argument async but this replaced by non_blocking as async became a reserved keyword in Python 3.7.
  https://github.com/pluskid/fitting-random-labels/pull/5

Use instead non_blocking:

The argument non_blocking has the same effect as async previously had:

• non_blocking (bool):
  If True and the source is in pinned memory, the copy will be asynchronous with respect to the host. Otherwise, the argument has no effect. Default: False.
  
  https://pytorch.org/docs/stable/tensors.html#torch.Tensor.cuda

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As an add-on: If you are interested in what async is actually used for you can take a look here: https://www.python.org/dev/peps/pep-0492/#new-syntax