code: def _make_dir(self, _id):
      new_dir = os.path.join(self.basedir, str(_id))
      os.mkdir(new_dir)
      self.dir = new_dir
  
imports: import json
  import os
  import os.path
  from pathlib import Path
  from typing import Optional
  import warnings
  from shutil import copyfile, SameFileError
  from sacred.commandline_options import cli_option
  from sacred.dependencies import get_digest
  from sacred.observers.base import RunObserver
  from sacred import optional
  from sacred.serializer import flatten
  from sacred.utils import PathType
label_desc: Use image node_id 6 for calling the FileStorageObserver obj's underlying member method code with example usage: obj._make_dir(_id) without return types