code: def load(
      f,
      map_location=None,
      pickle_module=pickle,
      decryption_key: Optional[str] = None,
      **pickle_load_args,
  ):
      """
      Load method that will be used to replace torch.load.
  
      Only used in patched torch.
  
      :param decryption_key: Optional[str] = None. If set to None, the original
             torch.load will be invoked.  Otherwise, the content will be decrypted
             before loading it back to memory.
      """
      if decryption_key is None:
          return torch.old_load(
              f,
              pickle_module=pickle_module,
              map_location=map_location,
              **pickle_load_args,
          )
      decrypted_buf = io.BytesIO()
      decryptor = _buf_operator(decryption_key)
      with _open_file_or_buffer(f, "rb") as opened_file:
          if _is_path(f):
              buf = io.BytesIO(opened_file.read())
              decryptor.decrypt_buffer(buf, decrypted_buf)
              buf.close()
          else:
              decryptor.decrypt_buffer(f, decrypted_buf)
      # After writing to the buffer, need to set it back to its original position
      decrypted_buf.seek(0)
      return torch.old_load(
          decrypted_buf,
          pickle_module=pickle_module,
          map_location=map_location,
          **pickle_load_args,
      )
  
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 4 for calling a global function with example usage: load(f, map_location, pickle_module, decryption_key) and returns: torch, torch