class_docstr: Output the data as input
  
  Examples:
      p1 = towhee.pipe.input('url').output('url')
code: def process_step(self):
      self._time_profiler.record(self.uid, Event.queue_in)
  
      data = self.read_row()
      if data is None:
          return
  
      self._time_profiler.record(self.uid, Event.process_in)
      self._time_profiler.record(self.uid, Event.process_out)
  
      if not self.data_to_next(data):
          return
  
      self._time_profiler.record(self.uid, Event.queue_out)
  
imports: from .node import Node
  from ._single_input import SingleInputMixin
  from towhee.runtime.time_profiler import Event
label_desc: Use image node_id 2 for calling the Output obj's underlying member method code with example usage: obj.process_step() without return types