class_docstr: Test the correctness of `sox_io_backend.load` for various formats
docstr: `sox_io_backend.load` can load sph format correctly.
code: def test_sphere(self, sample_rate, num_channels):
      """`sox_io_backend.load` can load sph format correctly."""
      self.assert_format(
          "sph", sample_rate, num_channels, bit_depth=32, duration=1
      )
  
imports: import itertools
  from functools import partial
  import torch
  from parameterized import parameterized
  from torchaudio._backend.utils import get_load_func
  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 10 for calling the TestLoad obj's underlying member method code with example usage: obj.test_sphere(sample_rate, num_channels) without return types