You may have inconsistent versions of PyMC3 and ArviZ. How did you install them?
Also can you try the functions native in ArviZ
import arviz as az
az.summary()
az.plot_trace()
You may have inconsistent versions of PyMC3 and ArviZ. How did you install them?
Also can you try the functions native in ArviZ
import arviz as az
az.summary()
az.plot_trace()