I have finally had time to look at this again. It appears that the tutorial Notebook still uses the old syntax with pm.expand_packed_triangular etc.
Please consider updating the tutorial Notebook to the new and simpler syntax.
I don’t know if you also maintain the Notebooks for ‘Statistical Rethinking’, but it could also do with an update to the improved syntax, if you have the time.
Thanks!
PS: The spam filter on this forum is REALLY annoying! I cannot post links to these Notebooks. Please disable the spam-filter.