Re:Neural networks in JavaScript – free 19-part course
by heavyset_go on Sunday December 23, 2018 @11:12PM
(#18750274)
Python is used because there are C/C++ bindings for working with NNs.
The point is that none of computations are done in pure Python. Python just provides a convenient wrapper over non-Python code.
Depends what "actual" computation is. If you're definition of "actual computation" is something which requires extreme optimization then your definition precludes the question. In the real world there is an extraordinary amount of computation done with inefficient languages though simply because development time costs very often outweighs run time costs.