code: def test_librimix_2speaker(self, task):
      dataset = LibriMix(
          self.root_dir,
          num_speakers=2,
          sample_rate=_SAMPLE_RATE,
          task=task,
      )
      self._test_librimix(dataset, self.samples_2spk, task)
  
file_path: audio/test/torchaudio_unittest/datasets/librimix_test.py
imports: import os
  from parameterized import parameterized
  from torchaudio.datasets import LibriMix
  from torchaudio_unittest.common_utils import get_whitenoise, save_wav, TempDirMixin, TorchaudioTestCase
label_desc: Use image node_id 3 for calling the TestLibriMix obj's underlying member method code with example usage: obj.test_librimix_2speaker(task) without return types