Latest pmdarima (1.7.1) requires statsmodels (>=0.11,<0.12)

[norihitoishida]

Latest pmdarima (1.7.1) requires statsmodels>=0.11,<0.12(latest), because latest statsmodels seems to have bugs.

• model.predict throwing constant trend value error for exogenous variable for period=1 and working fine for period>=1 alkaline-ml/pmdarima#376
• https://github.com/alkaline-ml/pmdarima/blob/master/requirements.txt

If users follow the official instructions for setting up Docker, they will end up with the latest statsmodels(0.12) installed.
So, should we fix requirements/main.txt like this?

- statsmodels>=0.11.1
+ statsmodels>=0.11.1, <0.12 

https://github.com/unit8co/darts/blob/master/requirements/main.txt

I would like to get your opinion. Thanks!

[hrzn]

Hi @norihitoishida , thanks for pointing this out! The next release should have statsmodels==0.11.1 (we are moving to == everywhere. In addition, we are also considering moving pmdarima to an optional extra dependency of Darts.

[norihitoishida]

Hi @hrzn , thanks for your reply. Sounds good!