human
I wrote the below code

    if isinstance(a.dtype, types.Complex):
        @register_jitable
        def cmplx_diag_walker(n, a, sgn):
            csgn = (sgn + 0j)
            acc = 0.0
            for k in range(n):
                absel = np.abs(a[(k, k)])
                csgn = (csgn * (a[(k, k)] / absel))
                acc = (acc + np.log(absel))
            return (csgn, acc)
        return cmplx_diag_walker
    else:
        @register_jitable
        def real_diag_walker(n, a, sgn):
            acc = 0.0
            for k in range(n):
                v = a[(k, k)]
                if (v < 0.0):
                    sgn = (- sgn)
                    v = (- v)
                acc = (acc + np.log(v))
            return ((sgn + 0.0), acc)
        return real_diag_walker

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def _get_slogdet_diag_walker(a):