def METHOD_NAME(self):
    """
    :return:
    """
    channel = Channel(self.address, self.port,
                      self.certificate).get_channel()
    reducer = rpc.ReducerStub(channel)
    request = fedn.GetGlobalModelRequest()
    try:
        response = reducer.GetGlobalModel(request)
    except grpc.RpcError as e:
        if e.code() == grpc.StatusCode.UNAVAILABLE:
            raise CombinerUnavailableError
        else:
            raise
    return response.model_id