code: def ip(self):
      return ray._private.services.get_node_ip_address()
  
file_path: analytics-zoo/pyzoo/test/zoo/ray/integration/ray_on_yarn.py
imports: import ray
  from zoo import init_spark_on_yarn
  from zoo.ray import RayContext
label_desc: Use image node_id 3 for calling the TestRay obj's underlying member method code with example usage: obj.ip() and returns: ray