docstr: Prepare the reader schema.
  
  Since an original reader is given,
  use it's schema as ground truth.
  
  Returns:
      schema: schema.Struct. Used in Reader.__init__(...).
docstr_tok: ["Prepare","the","reader","schema",".","Since","an","original","reader","is","given",",","use","it","'s","schema","as","ground","truth",".","Returns",":","schema",":","schema.Struct",".","Used","in","Reader.__init__","(","...",")","."]
code: def _init_reader_schema(self, *args, **kwargs):
      """Prepare the reader schema.
  
      Since an original reader is given,
      use it's schema as ground truth.
  
      Returns:
          schema: schema.Struct. Used in Reader.__init__(...).
      """
      return self.original_reader._schema
  
file_path: pytorch/caffe2/python/cached_reader.py
imports: import os
  from caffe2.python import core
  from caffe2.python.db_file_reader import DBFileReader
  from caffe2.python.pipeline import pipe
  from caffe2.python.task import Cluster, TaskGroup
label_desc: Use image node_id 2 for calling the CachedReader obj's underlying member method code with example usage: obj._init_reader_schema() and returns: self