<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def start_cluster_server(self, num_gpus=1, rdma=False):
 """Convenience function to access ``TFNode.start_cluster_server`` directly from this object instance."""

    return TFNode.start_cluster_server(self, num_gpus, rdma)