code: def exception_cause(exc: Optional[Exception]) -> Optional[Exception]:
      if not exc:
          return None
  
      return getattr(exc, "__cause__", None)
  
imports: import os
  import socket
  from contextlib import closing
  import logging
  import queue
  import threading
  from typing import Optional
  import numpy
  from ray.air.constants import _ERROR_REPORT_TIMEOUT
label_desc: Use image node_id 5 for calling a global function with example usage: exception_cause(exc) and returns: getattr, None