class_docstr: Create audio batch.
code: def get_data(self):
      if self.channels_first:
          shape = (self.batch_size, self.channels, self.sample_rate)
      else:
          shape = (self.batch_size, self.sample_rate, self.channels)
      return np.zeros(shape, dtype=np.int16)
  
file_path: adversarial-robustness-toolbox/tests/defences/preprocessor/test_mp3_compression.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from art.defences.preprocessor import Mp3Compression
  from tests.utils import ARTTestException
label_desc: Use image node_id 2 for calling the AudioInput obj's underlying member method code with example usage: obj.get_data() and returns: np