code: def test_1d_only(self):
      idx2d = [[1, 2, 3], [4, 5, 6]]
      assert_raises(ValueError, ix_, idx2d)
  
imports: import functools
  from unittest import expectedFailure, skipIf
  from pytest import raises
  from torch.testing._internal.common_utils import instantiate_parametrized_tests, parametrize, run_tests, TEST_WITH_TORCHDYNAMO, TestCase, xpassIfTorchDynamo
label_desc: Use image node_id 4 for calling the TestIx_ obj's underlying member method code with example usage: obj.test_1d_only() without return types