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It's becoming increasingly difficult to install this package due to reliance on pystan v2. This seems to cause a chain of requirements of other out of date packages.
Could we update it to use pystan v3 instead?
I think the changes that are needed would be
- In setup.py (on pypi) chance pystan==2.whatever to pystan>=3
- In interface.py change import pystan to import stan
- In interface.py update the code to use the newer version of pystan signatures.
Incidentally, I looked into using bridgestan and I don't suggest we convert to it. The big advantage of pystan is that it actually seems to be able to install stan, from scratch, with just a call to pip. Bridgestan requries a lot of manual configuration of stuff.
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