code: def decode(self, s):
      id_ = json.loads(s)
      file_reader = self.fs.open(id_)
      file_reader = BufferedReaderWrapper(file_reader)
      file_reader.hash = id_
      return file_reader
  
imports: import datetime
  import json
  import os
  from io import BufferedReader, FileIO
  from pathlib import Path
  from typing import Tuple
  from hashfs import HashFS
  from tinydb import TinyDB
  from tinydb_serialization import Serializer, SerializationMiddleware
  import sacred.optional
label_desc: Use image node_id 3 for calling the FileSerializer obj's underlying member method code with example usage: obj.decode(s) and returns: file_reader