code: def check_obj_validness(obj):
      if not obj:
          return False
      try:
          # check the validness of the cached vmomi obj
          _ = obj.name
          return True
      except vmodl.fault.ManagedObjectNotFound:
          return False
      except Exception as e:
          logger.error(
              f"Got an exception during check the pyvmomi obj validness: {e}"
          )
          return False
  
imports: import atexit
  import logging
  import ssl
  import time
  from enum import Enum
  from pyVim.connect import Disconnect, SmartStubAdapter, VimSessionOrientedStub
  from pyVim.task import WaitForTask
  from pyVmomi import vim, vmodl
  from ray.autoscaler._private.vsphere.utils import Constants, is_ipv4, singleton_client
label_desc: Use image node_id 2 for calling a global function with example usage: check_obj_validness(obj) and returns: False, True, False, False