code: def _send_one(self, addr, req):
      for iter in range(self._retries):
          sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
          try:
              sock.connect(addr)
              rfile = sock.makefile("rb")
              wfile = sock.makefile("wb")
              try:
                  self._wire.write(req, wfile)
                  resp = self._wire.read(rfile)
                  return resp
              finally:
                  rfile.close()
                  wfile.close()
          except:
              if iter == self._retries - 1:
                  # Raise exception on the last retry.
                  raise
          finally:
              sock.close()
  
imports: import random
  import socket
  import struct
  import threading
  import cloudpickle
  import psutil
  from six.moves import queue, socketserver
  from bluefog.run.horovodrun.common.util import secret
label_desc: Use image node_id 4 for calling the BasicClient obj's underlying member method code with example usage: obj._send_one(addr, req) and returns: resp