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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def routers_removed_from_hosting_device(self, context, router_ids, hosting_device):
 """Notify cfg agent that routers have been removed from hosting device. @param: context - information about tenant, user etc @param: router-ids - list of ids @param: hosting_device - device hosting the routers """

        self._agent_notification_bulk(
            context, 'router_removed_from_hosting_device', router_ids,
            hosting_device, operation=None)