How to change adapt_delta on pystan 3.9.1?

[Ezequiel_Alvarez]

Hi Guys again (2h later…haha):

I have found the answer to my question, the secret is to set the adapt_delta (and any other control such as max_depth, etc), in the model.sample() directive, and not in the stan.build().

This worked out perfect:

fit = model.sample(num_chains=4, num_samples=1000, delta=0.95)

I’ve got this solution after reading this other question:

Pystan, changing maximum treedepth

For a current fit I need to adjust the maximum treedepth. I am using Pystan. In the forum I found: fit = sm.sampling(..., control=dict(max_treedepth=15)) This however yields me just another error “{‘json’: {‘control’: [‘Unknown field.’]}}”. Thanks in advance.