code: def get_spk2utt(paths, audio_format="wav"):
      spk2utt = defaultdict(list)
      for path in paths:
          for audio in Path(path).rglob("*.{}".format(audio_format)):
              readerID = "dummy"
              uid = audio.stem
              spk2utt[readerID].append((uid, str(audio)))
  
      return spk2utt
  
label_desc: Use image node_id 1 for calling a global function with example usage: get_spk2utt(paths, audio_format) and returns: spk2utt