<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_update_callback(self, group, name=None, cb=None):
 """Remove the supplied callback for a group or a group.name"""

        if not cb:
            return

        if not name:
            if group in self.group_update_callbacks:
                self.group_update_callbacks[group].remove_callback(cb)
        else:
            paramname = '{}.{}'.format(group, name)
            if paramname in self.param_update_callbacks:
                self.param_update_callbacks[paramname].remove_callback(cb)