code: def down(db, dataset_name):
      match_d = {"name": dataset_name}
      dataset_dict = db.datasets.find_one(match_d)
  
      dataset_dict.pop("slug", None)
      dataset_dict.pop("description", None)
  
      _delete_saved_views(db, dataset_dict)
      _down_runs(db, dataset_dict, "annotation_runs")
      _down_runs(db, dataset_dict, "brain_methods")
      _down_runs(db, dataset_dict, "evaluations")
  
      db.datasets.replace_one(match_d, dataset_dict)
  
file_path: fiftyone/fiftyone/migrations/revisions/v0_19_0.py
imports: from datetime import datetime
  import logging
  import string
  from bson import ObjectId
label_desc: Use image node_id 2 for calling a global function with example usage: down(db, dataset_name) without return types