code: def unregister_iq_response(self, from_, id_):
          
          self._iq_response_map.remove_listener((from_, id_))
          self._logger.debug("iq response unregistered: from=%r, id=%r",
                             from_, id_)
docs: Unregister a registered callback or future for the IQ response
          identified by `from_` and `id_`. See
          :meth:`register_iq_response_future` or
          :meth:`register_iq_response_callback` for details on the arguments
          meanings and how to register futures and callbacks respectively.
  
          .. note::
  
             Futures will automatically be unregistered when they are cancelled.