code: def _cache_read(
      module_name: str,
      cache_key: str,
      compile_options: xc.CompileOptions,
      backend: xc.Client,
  ) -> tuple[xc.LoadedExecutable | None, int | None]:
      """Looks up the `computation` and it's compilation time in the persistent
      compilation cache repository.
      """
      try:
          return compilation_cache.get_executable_and_time(
              cache_key, compile_options, backend
          )
      except Exception as ex:
          if config.raise_persistent_cache_errors.value:
              raise
          warnings.warn(
              f"Error reading persistent compilation cache entry for "
              f"'{module_name}': {type(ex).__name__}: {ex}"
          )
          return None, None
  
imports: from __future__ import annotations
  from collections.abc import Sequence
  import time
  from typing import Any
  import logging
  import warnings
  import numpy
  from jax._src import lib
  from jax._src import distributed
  from jax._src import compilation_cache
  from jax._src import config
  from jax._src.xla_bridge import process_count
  from jax._src import monitoring
  from jax._src import profiler
  from jax._src import traceback_util
  from jax._src.interpreters import mlir
  from jax._src.lib import xla_extension_version
  from jax._src.lib.mlir import ir
  from jax._src.lib import xla_client
label_desc: Use image node_id 7 for calling a global function with example usage: _cache_read(module_name, cache_key, compile_options, backend) and returns: compilation_cache, None,  None