class_docstr: A class that listens for exceptions in children processes and propagates
  the tracebacks to the parent process.
docstr: error listener
docstr_tok: ["error","listener"]
code: def error_listener(self):
      """error listener"""
      (rank, original_trace) = self.error_queue.get()
      self.error_queue.put((rank, original_trace))
      os.kill(os.getpid(), signal.SIGUSR1)
  
imports: import os
  import signal
  import math
  import pickle
  import torch.distributed
  from datetime import timedelta
  from onmt.translate.translator import build_translator
  from onmt.transforms import get_transforms_cls
  from onmt.constants import CorpusTask
  from onmt.utils.logging import init_logger, logger
  from onmt.inputters.dynamic_iterator import build_dynamic_dataset_iter
label_desc: Use image node_id 3 for calling the ErrorHandler obj's underlying member method code with example usage: obj.error_listener() without return types