code: def load_metadata_from_desc_file(self, desc_file, partition='train',
                                       max_duration=16.0,):
          
          logger = logUtil.getlogger()
          logger.info('Reading description file: {} for partition: {}'
                      .format(desc_file, partition))
          audio_paths, durations, texts = [], [], []
          with open(desc_file) as json_line_file:
              for line_num, json_line in enumerate(json_line_file):
                  try:
                      spec = json.loads(json_line)
                      if float(spec['duration']) > max_duration:
                          continue
                      audio_paths.append(spec['key'])
                      durations.append(float(spec['duration']))
                      texts.append(spec['text'])
                  except Exception as e:
                      # Change to (KeyError, ValueError) or
                      # (KeyError,json.decoder.JSONDecodeError), depending on
                      # json module version
                      logger.warn('Error reading line #{}: {}'
                                  .format(line_num, json_line))
                      logger.warn(str(e))
  
          if partition == 'train':
              self.count = len(audio_paths)
              self.train_audio_paths = audio_paths
              self.train_durations = durations
              self.train_texts = texts
          elif partition == 'validation':
              self.val_audio_paths = audio_paths
              self.val_durations = durations
              self.val_texts = texts
              self.val_count = len(audio_paths)
          elif partition == 'test':
              self.test_audio_paths = audio_paths
              self.test_durations = durations
              self.test_texts = texts
          else:
              raise Exception("Invalid partition to load metadata. "
                              "Must be train/validation/test")
docs: Read metadata from the description file
              (possibly takes long, depending on the filesize)
          Params:
              desc_file (str):  Path to a JSON-line file that contains labels and
                  paths to the audio files
              partition (str): One of 'train', 'validation' or 'test'
              max_duration (float): In seconds, the maximum duration of
                  utterances to train or test on