code: def is_backend_tested(backend: str) -> bool:
      if backend not in find_names_of_all_frameworks():
          raise RuntimeError(f"Unknown framework {backend}")
      return backend in parse_backends_to_test()
  
file_path: einops/tests/__init__.py
imports: import logging
  import os
  from functools import lru_cache
  from typing import List, Tuple
  from einops import _backends
  import warnings
label_desc: Use image node_id 3 for calling a global function with example usage: is_backend_tested(backend) and returns: unknown