code: def _unsubscribe(self, uuid: str) -> None:
      self._watchers.pop(uuid)
  
imports: import asyncio
  import contextlib
  from collections.abc import Mapping, Sequence
  from dataclasses import dataclass
  from http import HTTPStatus
  from typing import Any, Optional
  from uuid import uuid4
  from motor.motor_asyncio import AsyncIOMotorClient
  from pymongo.errors import PyMongoError
  from sse_api.constants import HUB_CACHE_KIND
label_desc: Use image node_id 2 for calling the HubCachePublisher obj's underlying member method code with example usage: obj._unsubscribe(uuid) without return types