“async” is a reserved word in Python 3.7 and greater

Using async as a function parameter is a syntax error in Python >= 3.7. Other modules like PyTouch and Cuda have shifted to using non_blocking instead of async.

flake8 testing of https://github.com/hill-a/stable-baselines on Python 3.7.0

$ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

./stable_baselines/acktr/acktr_cont.py:83:68: E999 SyntaxError: invalid syntax
                               epsilon=1e-2, stats_decay=0.99, async=1, cold_iter=1,
                                                                   ^
./stable_baselines/acktr/value_functions.py:39:40: E999 SyntaxError: invalid syntax
                                   async=1, kfac_update=2, cold_iter=50,
                                       ^
./stable_baselines/acktr/acktr_disc.py:174:87: E999 SyntaxError: invalid syntax
                                                                stats_decay=0.99, async=1, cold_iter=10,
                                                                                      ^
./stable_baselines/acktr/kfac.py:15:74: E999 SyntaxError: invalid syntax
                 full_stats_init=False, cold_iter=100, cold_lr=None, async=False, async_stats=False, epsilon=1e-2,
                                                                         ^
4     E999 SyntaxError: invalid syntax
4

[hill-a]

Hey,

async_ can work, but considering most of the issues are from ACKTR, the async means asynchronous eigen decomposition, might as well call it async_eigen_decomp.

[araffin]

@geeksambhu Unless you already started, I plan to fix that issue tomorrow 😉.