code: def test_audio_dataset_from_directory_ragged(self):
      directory = self._prepare_directory(
          num_classes=2, count=16, different_sequence_lengths=True
      )
      dataset = audio_dataset_utils.audio_dataset_from_directory(
          directory, ragged=True, batch_size=8
      )
      batch = next(iter(dataset))
  
      self.assertEqual(batch[0].shape.as_list(), [8, None, None])
  
imports: import os
  import numpy
  from keras import testing
  from keras.utils import audio_dataset_utils
  from keras.utils.module_utils import tensorflow
label_desc: Use image node_id 12 for calling the AudioDatasetFromDirectoryTest obj's underlying member method code with example usage: obj.test_audio_dataset_from_directory_ragged() without return types