code: def _fire_event(self, event_name, *event_args, **event_kwargs):
          
          if event_name in self._allowed_events:
              self._logger.debug("firing handlers for event %s ", event_name)
              for func, args, kwargs in self._event_handlers[event_name]:
                  kwargs.update(event_kwargs)
                  func(self, *(event_args + args), **kwargs)
docs: Execute all the handlers associated with given event.
  
          This method executes all handlers associated with the event
          `event_name`. Optional positional and keyword arguments can be used to
          pass arguments to **all** handlers added with this event. These
          aguments updates arguments passed using :meth:`~ignite.engine.Engine.add_event_handler`.
  
          Args:
              event_name: event for which the handlers should be executed. Valid
                  events are from :class:`~ignite.engine.Events` or any `event_name` added by
                  :meth:`~ignite.engine.Engine.register_events`.
              *event_args: optional args to be passed to all handlers.
              **event_kwargs: optional keyword args to be passed to all handlers.