code: def load_key(self, key):
      pass
  
file_path: metaflow/metaflow/datastore/content_addressed_store.py
imports: import gzip
  from collections import namedtuple
  from hashlib import sha1
  from io import BytesIO
  from ..exception import MetaflowInternalError
  from .exceptions import DataException
label_desc: Use image node_id 1 for calling the BlobCache obj's underlying member method code with example usage: obj.load_key(key) without return types