code: def getBarsFrequency(self):
      ret = retry_on_network_error(self.__server.getBarsFrequency)
      ret = int(ret)
      return ret
  
imports: import socket
  import multiprocessing
  import retrying
  from six.moves import xmlrpc_client
  import pyalgotrade.logger
  from pyalgotrade import barfeed
  from pyalgotrade.optimizer import serialization
label_desc: Use image node_id 4 for calling the Worker obj's underlying member method code with example usage: obj.getBarsFrequency() and returns: ret