def METHOD_NAME(root_dir):
  utt2spk = {}
  utt2wav = {}
  num_good_files = 0
  num_bad_files = 0
  noise_dir = os.path.join(root_dir, "noise")
  for root, dirs, files in os.walk(noise_dir):
    for file in files:
      file_path = os.path.join(root, file)
      if file.endswith(".wav"):
        utt = str(file).replace(".wav", "")
        utt2wav[utt] = file_path
        utt2spk[utt] = utt
  utt2spk_str = ""
  utt2wav_str = ""
  for utt in utt2spk:
    if utt in utt2wav:
      utt2spk_str = utt2spk_str + utt + " " + utt2spk[utt] + "\n"
      utt2wav_str = utt2wav_str + utt + " " + utt2wav[utt] + "\n"
      num_good_files += 1
    else:
      print("Missing file {}".format(utt))
      num_bad_files += 1
  print("In noise directory, processed {} files: {} had missing wav data".format(num_good_files, num_bad_files))
  return utt2spk_str, utt2wav_str