code: def testCollectData(self):
      output = common_voice._collect_data(_TESTDATA)
      self.assertEqual(1, len(output))
  
      # NOTE: No header.
      self.assertTrue("my_media" == output[0][0])
      self.assertTrue("my_label" == output[0][2])
  
file_path: tensor2tensor/tensor2tensor/data_generators/common_voice_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from tensor2tensor.data_generators import common_voice
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the CommonVoiceTest obj's underlying member method code with example usage: obj.testCollectData() without return types