code: def testSpeechCommandsSum(self):
      dataset_all = speechcommands.SPEECHCOMMANDS(self.root_dir)
      dataset_train = speechcommands.SPEECHCOMMANDS(
          self.root_dir, subset="training"
      )
      dataset_valid = speechcommands.SPEECHCOMMANDS(
          self.root_dir, subset="validation"
      )
      dataset_test = speechcommands.SPEECHCOMMANDS(
          self.root_dir, subset="testing"
      )
  
      assert len(dataset_train) + len(dataset_valid) + len(
          dataset_test
      ) == len(dataset_all)
  
file_path: audio/test/torchaudio_unittest/datasets/speechcommands_test.py
imports: import os
  from pathlib import Path
  from torchaudio.datasets import speechcommands
  from torchaudio_unittest.common_utils import get_whitenoise, normalize_wav, save_wav, TempDirMixin, TorchaudioTestCase
label_desc: Use image node_id 8 for calling the TestSpeechCommands obj's underlying member method code with example usage: obj.testSpeechCommandsSum() without return types