class_docstr: Store models in cloud and fetch them when needed.
class_docstr_tok: ["Store","models","in","cloud","and","fetch","them","when","needed","."]
docstr: Downloads a model previously persisted to cloud storage.
docstr_tok: ["Downloads","a","model","previously","persisted","to","cloud","storage","."]
code: def _retrieve_tar(self, filename: Text) -> None:
      """Downloads a model previously persisted to cloud storage."""
      raise NotImplementedError
  
imports: import abc
  import logging
  import os
  import shutil
  from typing import Optional, Text, Tuple, TYPE_CHECKING
  import rasa.shared.utils.common
  import rasa.utils.common
label_desc: Use image node_id 3 for calling the Persistor obj's underlying member method code with example usage: obj._retrieve_tar(filename) without return types