Essentially, the task is scientific in nature, so the most important thing is to achieve a solution. Ideally, the user should interact as little as possible with programs unrelated to C++. In particular, my colleagues dislike that when using @aseyboldt nust-rs , it’s necessary to download the Cargo compiler and then integrate Rust code into the main code. The same applies to nutpie.
Although I recognize that this is likely the simplest solution to the problem, because I cannot implement such a specialized model in Stan, as my C++ function computes the energy and gradient numerically.