code: def retrieve_msg(conn):
      """
      Retrieve a message from the socket channel.
  
      :param conn:
      :return:
      """
      cmd = _retrieve_buffer(conn, 1)
      if cmd == LOAD_MSG:
          msg = _retrieve_load_msg(conn)
      elif cmd == PREDICT_MSG:
          msg = _retrieve_inference_msg(conn)
          logging.info("Backend received inference at: %d", time.time())
      else:
          raise ValueError("Invalid command: {}".format(cmd))
  
      return cmd, msg
  
imports: import io
  import json
  import logging
  import os
  import struct
  import sys
  import time
  from builtins import bytearray, bytes
  import torch
  from ts.utils.util import deprecated
label_desc: Use image node_id 1 for calling a global function with example usage: retrieve_msg(conn) and returns: cmd,  msg