Error using init='advi+adapt_diag_grad' update() missing 1 required positional argument

Questions
4

Experiencing the same error (not the printer one…) running on pymc3 version 3.8 and theano version 1.04. This seems weird because in my case i define tune together with init

trace= pm.sample(4000,tune=1000,init='advi+adapt_diag',chains=2,cores=8)