code: def read(self, net):
      net, _, fields = self.read_ex(net, None)
      return net, fields
  
imports: from caffe2.python import core, dataio
  from caffe2.python.task import TaskGroup
  import logging
label_desc: Use image node_id 4 for calling the _QueueReader obj's underlying member method code with example usage: obj.read(net) and returns: net,  fields