code: def get_cluster_backend(
      backend_name: str,
  ) -> Type[AbstractClusterBackend]:
      return _cluster_backend_types[backend_name]
  
imports: from abc import ABC, abstractmethod
  from typing import AsyncGenerator, Dict, List, Optional, Type
  from ..core import NodeRole
label_desc: Use image node_id 2 for calling a global function with example usage: get_cluster_backend(backend_name) and returns: _cluster_backend_types