code: def by_scheme(self):
      yield from self._odb.items()
  
file_path: dvc/dvc/cachemgr.py
imports: import os
  from typing import TYPE_CHECKING, Optional, Tuple
  from dvc.fs import GitFileSystem, Schemes
  from dvc_data.hashfile.db import get_odb
  from dvc_data.hashfile.hash import DEFAULT_ALGORITHM
label_desc: Use image node_id 5 for calling the CacheManager obj's underlying member method code with example usage: obj.by_scheme() without return types