code: def format_master_url(master, rpc_layer=None):
      if rpc_layer:
          return "%s://%s" % (rpc_layer, master)
      else:
          return master
  
file_path: tensorflow-upstream/tensorflow/python/distribute/cluster_resolver/sagemaker_cluster_resolver.py
imports: import json
  import os
  from tensorflow.python.distribute.cluster_resolver.cluster_resolver import ClusterResolver
  from tensorflow.python.training.server_lib import ClusterSpec
label_desc: Use image node_id 1 for calling a global function with example usage: format_master_url(master, rpc_layer) and returns: unknown, master