code: def network(self):
      from urllib.request import urlopen
  
      try:
          urlopen("http://www.baidu.com", timeout=3)
          return True
      except Exception as err:
          return False
  
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 4 for calling the TestRay obj's underlying member method code with example usage: obj.network() and returns: True, False