BUG: Unable to import pymc (pymc.model module not found error)

[LLouedKhen]

Describe the issue:

I'm trying to use a package dependent on pymc (HDDM) but run into the error below when I try to import pymc. I can't find a similar error online anywhere.
Installing pymc using conda seems to run smoothly but when I try to import in python, it gives me an error (see below).
What could be the culprit? A similar function elsewhere?
Thanks in advance.

Reproduceable code example:

import pymc

Error message:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/anaconda3/envs/pyHDDM/lib/python3.7/site-packages/pymc/__init__.py", line 32, in <module>
    from .distributions import *
  File "/opt/anaconda3/envs/pyHDDM/lib/python3.7/site-packages/pymc/distributions/__init__.py", line 22, in <module>
    from pymc.distributions.bound import Bound
  File "/opt/anaconda3/envs/pyHDDM/lib/python3.7/site-packages/pymc/distributions/bound.py", line 23, in <module>
    from pymc.distributions.continuous import BoundedContinuous, bounded_cont_transform
  File "/opt/anaconda3/envs/pyHDDM/lib/python3.7/site-packages/pymc/distributions/continuous.py", line 90, in <module>
    from pymc.distributions.distribution import DIST_PARAMETER_TYPES, Continuous
  File "/opt/anaconda3/envs/pyHDDM/lib/python3.7/site-packages/pymc/distributions/distribution.py", line 50, in <module>
    from pymc.printing import str_for_dist, str_for_symbolic_dist
  File "/opt/anaconda3/envs/pyHDDM/lib/python3.7/site-packages/pymc/printing.py", line 25, in <module>
    from pymc.model import Model
ModuleNotFoundError: No module named 'pymc.model'

PyMC version information:

pymc 2.3.8
OS: Mojave 10.14.6
Installation: conda

Context for the issue:

I'm trying to use a package dependent on pymc (HDDM) but run into the error below when I try to import pymc. I can't find a similar error online anywhere. HDDM requires python 3.7 and pymc 2.3.8.

[michaelosthege]

The symptoms look similar to what I get when a module is not installed correctly.

Try print(pymc) and if there's something about "namespace" this is what I usually see when the installation directory did not get removed correctly in a previous uninstall.

Check /opt/anaconda3/envs/pyHDDM/lib/python3.7/site-packages/pymc/ and see if there's any content.
Maybe delete it manually and reinstall.

In the worst case nuke the environment and recreate with mamba create -n pmv501 -c conda-forge pymc

[michaelosthege]

@LLouedKhen did you get it fixed?

[LLouedKhen]

I checked the package contents as suggested but nothing seems a miss. In the end, I just did a workaround, created a new environment in python 3.6. I can get the HDDM package to work there without having it complain about pymc. Thank you. L.

[michaelosthege]

Oh, you are using https://github.com/hddm-devs/hddm ?

Looks like HDDM needs to update it's PyMC dependency pin: https://github.com/hddm-devs/hddm/blob/a0d9dba42b22404a10068ad67aec4061132c369e/requirements.txt#L16.

Your success with that Python 3.6 environment might be "luck" because newer PyMC versions don't support Python 3.6 and therefore pip gave you pymc==2.3.8. See https://pypi.org/project/pymc/#history