code: def close(self):
      for _, f in self._module_to_file.items():
          f.close()
  
imports: from inspect import Parameter, Signature
  import ast
  import os
  from pathlib import Path
  from contextlib import closing
  from typing import Union, Optional
  from typing import Sequence, List, Any
  from nvidia.dali import backend
  from nvidia.dali import types
  from nvidia.dali.ops import _registry, _names, _docs
  from nvidia.dali import types
  from nvidia.dali import ops, fn
label_desc: Use image node_id 3 for calling the StubFileManager obj's underlying member method code with example usage: obj.close() without return types