code: def check_graph(
      self,
      stages: Iterable["Stage"],
      callback: Optional[Callable] = None,
  ) -> None:
      if not getattr(self, "_skip_graph_checks", False):
          new = self.index.update(stages)
          if callable(callback):
              callback()
          new.check_graph()
  
imports: import os
  from collections import defaultdict
  from contextlib import contextmanager
  from functools import wraps
  from typing import TYPE_CHECKING, Callable, ContextManager, Iterable, Optional, Tuple, Union
  from dvc.exceptions import DvcException, NotDvcRepoError, OutputNotFoundError, RevCollectionError
  from dvc.ignore import DvcIgnoreFilter
  from dvc.log import logger
  from dvc.utils.objects import cached_property
label_desc: Use image node_id 8 for calling the Repo obj's underlying member method code with example usage: obj.check_graph(stages, callback) without return types