Python 3.7: SyntaxError: invalid syntax due to the use of `async` which is a keyword

[REASY]

Followed https://github.com/facebookresearch/ELF#install-scripts and got Python 3.7.9 installed, where async is a keyword: https://www.python.org/dev/peps/pep-0492/#deprecation-plans

At least those places need a fix:

ELF/elf/utils_elf.py

Line 191 in 1f79017

def transfer_cpu2gpu(self, batch_gpu, async=True):

ELF/elf/utils_elf.py

Line 197 in 1f79017

def transfer_cpu2cpu(self, batch_dst, async=True):

Other references:

• pytorch/pytorch#3431