[singhrac]

This is a hard comparison because pretty much all of these libraries call a BLAS implementation under the hood, so what you might be comparing is actually the cost of stuffing the array with your data in each language (which is obviously task specific).

I think it'd be difficult to argue one way or another: Eigen gives you flexibility one way (custom kernels) and Python gives you another (interactive debugging and easy visualization). Cython/Numba make it even more muddied.