code: def send_upstream(self, value, flags=0):
      assert not self.root
      self.upstream.send_multipart(self.serialize(value), flags=flags)
  
imports: import re
  import socket
  from functools import reduce
  import zmq
  from ipyparallel.serialize import deserialize_object, serialize_object
  from ipyparallel.util import disambiguate_url
label_desc: Use image node_id 9 for calling the BinaryTreeCommunicator obj's underlying member method code with example usage: obj.send_upstream(value, flags) without return types