Creates a `tf.train.ServerDef` protocol buffer. Args: server_or_cluster_def: A `tf.train.ServerDef` or `tf.train.ClusterDef` protocol buffer, or a `tf.train.ClusterSpec` object, describing the server to be defined and/or the cluster of which it is a member. job_name: (Optional
(server_or_cluster_def, job_name, task_index, protocol,
config)
source not stored for this graph (policy: none)
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