Compute pivoted LU decomposition of a matrix.
The decomposition is:
A = P L U
where P is a permutation matrix, L lower triangular with unit diagonal elements, and U upper triangular.
Parameters :  a : array, shape (M, M)
overwrite_a : boolean


Returns :  lu : array, shape (N, N)
piv : array, shape (N,)

See also
Notes
This is a wrapper to the *GETRF routines from LAPACK.