class_docstr: A registry of
  :class:`fiftyone.core.odm.document.MongoEngineBaseDocument` classes found
  when importing data from the database.
code: def _get_cls(self, module, name):
      cls = getattr(module, name)
  
      try:
          assert issubclass(cls, food.MongoEngineBaseDocument)
      except:
          raise AttributeError
  
      return cls
  
imports: from datetime import date, datetime
  import inspect
  import json
  import numbers
  import six
  import sys
  from bson import Binary, json_util, ObjectId, SON
  import numpy
  import pytz
  import fiftyone
  import fiftyone.core.fields
  import fiftyone.core.media
  import fiftyone.core.utils
label_desc: Use image node_id 4 for calling the DocumentRegistry obj's underlying member method code with example usage: obj._get_cls(module, name) and returns: cls