human
I wrote the below code

    def feval(label, pred):
        'Internal    eval    function.'
        return numpy_feval(label, pred)
    feval.__name__ = numpy_feval.__name__
    return CustomMetric(feval, name, allow_extra_outputs)

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

def np(numpy_feval, name=None, allow_extra_outputs=False):