class_docstr: A subclass of the Unpickler to unpickle our numpy pickles.
code: def _open_pickle(self, file_handle):
      return BytesIO(read_zfile(file_handle))
  
imports: import pickle
  import os
  import zlib
  from io import BytesIO
  from ._compat import PY3_OR_LATER
  from .numpy_pickle_utils import _ZFILE_PREFIX
  from .numpy_pickle_utils import Unpickler
label_desc: Use image node_id 2 for calling the ZipNumpyUnpickler obj's underlying member method code with example usage: obj._open_pickle(file_handle) and returns: BytesIO