I got the same error after installing qnt locally with pip.
There is indeed a circular import in the current Github repo for the toolbox, introduced by this commit:
https://github.com/quantiacs/toolbox/commit/78beafa93775f33606156169b3e6b8f995804151#diff-89350fe373763b439e4697f9b11cceb811b4a3f0adc7a655707a936ce5646c01R6-R10
when some of the imports in output.py which were inside of fuctions before were moved to the top level.
Now output imports from stats and stats imports from output.
@support Can you please have a look?
@alexeigor @omohyoid
The conda version of qnt doesn't seem affected, so if that's an option for you install that one.
Otherwise we can use the git version previous to the commit above: