[D] Functional Programming in ML

I feel like most ML libraries in Python are written in OOP style. This makes sense given Python does not have an “good” type system, like Haskell, and so a class is a good way to define an interface under a readable name. Are there popular ML libraries in other more functional languages? I’m specifically thinking of Haskell, Rust, or Scala.

class functional good languages libraries machinelearning oop popular programming python sense style type