code: def stop(self):
      pass
  
imports: import abc
  from pyalgotrade import bar
  from pyalgotrade.dataseries import bards
  from pyalgotrade import feed
  from pyalgotrade import dispatchprio
label_desc: Use image node_id 5 for calling the OptimizerBarFeed obj's underlying member method code with example usage: obj.stop() without return types