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


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

Tags:

Python

Pytorch