Why is Cython included?

[lucidfrontier45]

I found Cython is still included in the install dependencies.

prophet/python/requirements.txt

Line 1 in 95b1741

Cython>=0.22

My understanding is that it is required for pystan2. As of Prophet 1.1 the backend is completely moved to cmdstanpy. Why is Cython still required?

[WardBrian]

I believe this was an oversight in #2148 and it should be removed

[WardBrian]

@tcuongd want to knock this one off as well? I think it’s causing some annoyances for the conda package.

Also worth considering updating the “fbprophet” shim to not pin 1.0 any more