code: def _CreateSyntheticExample(self):
      sequence = self._CreateSyntheticSequence()
      wav_samples = np.zeros(9 * SAMPLE_RATE, np.float32)
      wav_data = audio_io.samples_to_wav_data(wav_samples, SAMPLE_RATE)
      return wav_data, sequence
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from magenta.models.onsets_frames_transcription import audio_label_data_utils
  from note_seq import audio_io
  from note_seq import constants
  from note_seq import testing_lib
  from note_seq.protobuf import music_pb2
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 2 for calling the SplitAudioTest obj's underlying member method code with example usage: obj._CreateSyntheticExample() and returns: wav_data,  sequence