code: def is_initialized():
      cls = (
          InProcessCommunicator
          if __use_threads
          else DistributedCommunicator
      )
      return cls.is_initialized()
  
imports: from .communicator import Communicator
  from .distributed_communicator import DistributedCommunicator
  from .in_process_communicator import InProcessCommunicator
label_desc: Use image node_id 4 for calling a global function with example usage: is_initialized() and returns: cls