code: def _is_frames_dict(label):
      return isinstance(label, dict) and fofu.is_frame_number(
          next(iter(label.keys()))
      )
  
imports: import os
  from bson import ObjectId
  from fiftyone.core.document import Document, DocumentView
  import fiftyone.core.frame
  import fiftyone.core.frame_utils
  import fiftyone.core.labels
  import fiftyone.core.metadata
  import fiftyone.core.media
  import fiftyone.core.odm
  import fiftyone.core.utils
  from fiftyone.core.singletons import SampleSingleton
label_desc: Use image node_id 3 for calling a global function with example usage: _is_frames_dict(label) and returns: unknown