class_docstr: custom wrappers around ops
code: def schema(self):
      return self._schema
  
file_path: DALI/dali/python/nvidia/dali/ops/_operators/tfrecord.py
imports: from nvidia.dali import backend
  from nvidia.dali import ops
label_desc: Use image node_id 3 for calling the _TFRecordReaderImpl obj's underlying member method code with example usage: obj.schema() and returns: self