class_docstr: Abstract class defining the functions that a Communicator should implement.
class_docstr_tok: ["Abstract","class","defining","the","functions","that","a","Communicator","should","implement","."]
code: def shutdown(cls):
      raise NotImplementedError("shutdown is not implemented")
  
imports: import sys
  import timeit
  from crypten.config import cfg
label_desc: Use image node_id 4 for calling the Communicator obj's underlying member method code with example usage: obj.shutdown(cls) without return types