torch.argsort is not stable by default #354
Description
According to the standard for argsort, the default should be stable=True. So I'd expect these two argsorts to produce the same result (xp.arange(30), essentially), but they do not.
# array_api_compat version 1.12.0
from array_api_compat import torch as xp
x = xp.asarray([10]*30)
xp.argsort(x)
# tensor([15, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 0, 14, 13,
# 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1])
xp.argsort(x, stable=True)
# tensor([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
# 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29])