code: def hostname(self):
      import socket
  
      return socket.gethostname()
  
file_path: BigDL/python/orca/test/bigdl/orca/ray/test_reinit_raycontext.py
imports: import time
  from unittest import TestCase
  import numpy
  import psutil
  import pytest
  import ray
  from bigdl.dllib.nncontext import init_spark_on_local
  from bigdl.orca.ray import OrcaRayContext
label_desc: Use image node_id 1 for calling the TestRay obj's underlying member method code with example usage: obj.hostname() and returns: socket