human
I wrote the below code

    def derivative2(input, axis, output, mode, cval):
        return correlate1d(input, [1, (-2), 1], axis, output, mode, cval, 0)
    return generic_laplace(input, derivative2, output, mode, cval)

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

@docfiller
def laplace(input, output=None, mode='reflect', cval=0.0):