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This is because BridgeStan is not Nix-packaged yet and thus would make for a missing import if a user uses the Nix derivation in `examples/nix/chainsail_helpers.nix` and then only wants to use the httpstan wrapper.
This is for BridgeStan compatibility. BridgeStan requires at least Python 3.9.
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This PR adds a BridgeStan (https://github.com/roualdes/bridgestan) wrapper to the list of PDF interface implementations. Together with tweag/chainsail#480, this allows for much faster sampling of Stan models.
This change also includes a refactoring of the
chainsail_helpers.pdf.stanmodule into two submodules,httpstanandbridgestan, each containing the respective wrappers. This also has the advantage of making thechainsail-helpershttpstanwrapper usable without having to have BridgeStan installed (which can be a bit of a hassle).