text: from backend.Utils import face_detection
  from multiprocessing import Pool
  
  
  def _face_detection(imgfiles, outfilenames, sess_id):
      with Pool(processes=1) as pool:
          return pool.apply(face_detection, (imgfiles, outfilenames, sess_id))
  
  
  def detect_listener(imgfiles, outfilenames, sess_id):
      return _face_detection(imgfiles, outfilenames, sess_id)
  