code: def determine_master(port=4000):
      """Determine address of master so that workers
      can connect to it. If the environment variable
      SPARK_LOCAL_IP is set, that address will be used.
  
      :param port: port on which the application runs
      :return: Master address
  
      Example usage:
          SPARK_LOCAL_IP=127.0.0.1 spark-submit --master \
              local[8] examples/mllib_mlp.py
      """
      if os.environ.get("SPARK_LOCAL_IP"):
          return os.environ["SPARK_LOCAL_IP"] + ":" + str(port)
      else:
          return gethostbyname(gethostname()) + ":" + str(port)
  
imports: import pickle
  from socket import gethostbyname, gethostname
  import os
label_desc: Use image node_id 1 for calling a global function with example usage: determine_master(port) and returns: unknown, unknown