code: def setUp(self):
      init_orca_context(runtime="ray", address="localhost:6379")
  
file_path: BigDL/python/orca/test/bigdl/orca/learn/ray/ctx/test_tf2_ray_runtime.py
imports: import pytest
  from unittest import TestCase
  import numpy
  import tensorflow
  from bigdl.orca import init_orca_context, stop_orca_context
  from bigdl.orca.learn.tf2 import Estimator
label_desc: Use image node_id 1 for calling the TestTF2Estimator obj's underlying member method code with example usage: obj.setUp() without return types