human
I wrote the below code

    period = int(max(1, period))
    def _callback(iter_no, sym=None, arg=None, aux=None):
        'The    checkpoint    function.'
        if (((iter_no + 1) % period) == 0):
            mod.save_checkpoint(prefix, (iter_no + 1), save_optimizer_states)
    return _callback

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

def module_checkpoint(mod, prefix, period=1, save_optimizer_states=False):