class_docstr: Test the correctness of `sox_io_backend.load` for various formats
docstr: `sox_io_backend.load` can load wav file with more than 2 channels.
docstr_tok: ["`","sox_io_backend.load","`","can","load","wav","file","with","more","than","2","channels","."]
code: def test_multiple_channels(self, dtype, num_channels):
      """`sox_io_backend.load` can load wav file with more than 2 channels."""
      sample_rate = 8000
      normalize = False
      self.assert_wav(
          dtype, sample_rate, num_channels, normalize, duration=1
      )
  
imports: import itertools
  import torch
  from parameterized import parameterized
  from torchaudio.backend import sox_io_backend
  from torchaudio_unittest.common_utils import get_asset_path, get_wav_data, load_wav, nested_params, PytorchTestCase, save_wav, skipIfNoExec, skipIfNoSox, skipIfNoSoxDecoder, sox_utils, TempDirMixin
  from .common import name_func
label_desc: Use image node_id 4 for calling the TestLoad obj's underlying member method code with example usage: obj.test_multiple_channels(dtype, num_channels) without return types