pymc3 Updates breaks older notebooks

[d-giles]

As a note: updates to pymc3 have broken older notebooks without obvious (to a beginner at least) solutions. I'd suggest dropping pointers to updated curricula where appropriate.

[adamamiller]

Can you provide a list of the notebooks where you have encountered these errors? Does not need to be comprehensive, but it's really helpful to track down examples.

[d-giles]

The two I was looking at (along with a student) were from my cohort's start, Session 4, so they're relatively old. Not sure if these same issues affect the most recent MCMC units in session 10, but pymc3 did a major update at the beginning of this year so they may be affected.

Here are the notebooks we were looking at:

• Session 4 Day 2 Intro to PYMC3
• Session 4 Day 2 Sampling Techniques in MCMC