code: def __init__(self, repo):
      self.repo = repo
      self.cache_dir = os.path.join(self.repo.cache.legacy.path, "runs")
  
imports: import os
  from contextlib import contextmanager
  from typing import TYPE_CHECKING, List, Optional, Tuple
  from funcy import first
  from dvc import fs
  from dvc.config import RemoteConfigError
  from dvc.exceptions import CollectCacheError, DvcException
  from dvc.log import logger
  from dvc.utils import dict_sha256, relpath
label_desc: Use image node_id 1 to create a new StageCache object  with example: obj = StageCache(repo)