blackbox_external_likelihood.ipynb contains "modulenotfound" in first cell

[MarcoGorelli]

Seems this was introduced in commit a3622d3

$ git log --pretty=oneline -G "ModuleNotFoundError" -- docs/source/notebooks/blackbox_external_likelihood.ipynb
a3622d3f5c66f5fcc4dbcc52f8b1653a1f812583 Update more NBs. Remove Dawid-Skene.

See https://nbviewer.jupyter.org/github/pymc-devs/pymc3/blob/master/docs/source/notebooks/blackbox_external_likelihood.ipynb :

The Cython extension is already loaded. To reload it, use:
  %reload_ext Cython
Running on PyMC3 v3.6
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-2-1cf6341006dd> in <module>()
     19 import matplotlib
     20 import emcee
---> 21 import corner
     22 import os
     23 print("Python version:     {}".format(platform.python_version()))

ModuleNotFoundError: No module named 'corner'

---

cc @twiecki

[twiecki]

Thanks @MarcoGorelli. We should probably just remove that dependency and use arviz for plotting. Want to do a PR?

[MarcoGorelli]

sure, I'll take it up later this week!

[MarcoGorelli]

Hi @twiecki

I tried running this notebook, but got to cell 4 and got

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-18-e2f2f0233a4c> in <module>
      7 ctrue = 3.0  # true y-intercept
      8 
----> 9 truemodel = my_model([mtrue, ctrue], x)
     10 
     11 # make data

NameError: name 'my_model' is not defined

---

I have Cython installed and am able to run the example from https://cython.readthedocs.io/en/latest/src/tutorial/cython_tutorial.html#primes

Is there any extra setup I need to do to be able to run this one?

[ricardoV94]

Should this be moved to pymc-examples @OriolAbril ?

[OriolAbril]

We already have pymc-devs/pymc-examples#48 to track this. Some more context is probably good though