Yeah, I was caught between the switch from version 2 to version 3 as well and these updates sometimes require refactoring the code to make it work, but it’s all for the best. Once again, with CmdStanPy the good thing is that in addition to the within-Python objects the .csv files are also saved and work the same as the output generated by CmdStan, which I found very convenient compared to pickling or generating a custom .csv, so you get the best of both worlds.
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