code: def register_backend_factory(
      name: str,
      factory: BackendFactory,
      *,
      priority: int = 0,
      fail_quietly: bool = True,
      experimental: bool = False,
  ) -> None:
      with _backend_lock:
          if name in _backends:
              raise RuntimeError(f"Backend {name} already initialized")
      _backend_factories[name] = BackendRegistration(
          factory, priority, fail_quietly, experimental
      )
  
imports: from __future__ import annotations
  from __future__ import annotations
  from collections.abc import Mapping
  import dataclasses
  from functools import lru_cache, partial
  import importlib
  import json
  import logging
  import os
  import pkgutil
  import platform
  import sys
  import threading
  from typing import Any, Callable, Union
  import warnings
  from jax._src import config
  from jax._src import distributed
  from jax._src import traceback_util
  from jax._src import util
  from jax._src import hardware_utils
  from jax._src.cloud_tpu_init import maybe_import_libtpu
  from jax._src.lib import cuda_versions
  from jax._src.lib import xla_client
  from jax._src.lib import xla_extension
  from jax._src.lib import xla_extension_version
label_desc: Use image node_id 4 for calling a global function with example usage: register_backend_factory(name, factory) without return types