>I'm wondering though, what is the advantage of using a whole new programming language rather than say, a Python library? The idea is that if you can write the

>I'm wondering though, what is the advantage of using a whole new programming language rather than say, a Python library? The idea is that if you can write the program, you can sample from the generative model. Most libraries like Stan don't really provide a "Turing-complete" probabilistic language. Daniel Roy, IIRC, studies precisely why or when you want this kind of "completeness", as well as other topics in PPL theory.