code: def __exit__(self, *args):
      self.file_like.flush()
  
imports: import torch
  from torch.utils.data import Dataset
  import io
  import os
  import pathlib
  from cryptography.fernet import Fernet
  from typing import BinaryIO, Union, IO, Optional
  import pickle
  from bigdl.nano.utils.common import invalidInputError
label_desc: Use image node_id 1 for calling the _open_buffer_writer obj's underlying member method code with example usage: obj.__exit__() without return types