code: def _sf2(args):
      
      # an easier to debug traceback when multiprocessing
      # thanks to https://stackoverflow.com/a/16618842/1710603
      try:
          return sigma_filter(*args)
      except:
          import traceback
          raise Exception("".join(traceback.format_exception(*sys.exc_info())))
docs: A shallow wrapper for sigma_filter.
  
      Parameters
      ----------
      args : list
          A list of arguments for sigma_filter
  
      Returns
      -------
      None