code: def _release_read(lock, info, changes):
      for url in changes:
          assert "read" in lock
          assert url in lock["read"]
          assert info in lock["read"][url]
          lock["read"][url].remove(info)
          if not lock["read"][url]:
              del lock["read"][url]
          if not lock["read"]:
              del lock["read"]
  
imports: import json
  import os
  from collections import defaultdict
  from contextlib import contextmanager
  import psutil
  from voluptuous import Invalid, Optional, Required, Schema
  from dvc.log import logger
  from .exceptions import DvcException
  from .fs import localfs
  from .lock import make_lock
  from .utils import relpath
label_desc: Use image node_id 7 for calling a global function with example usage: _release_read(lock, info, changes) without return types