code: def test_load_obj_error_inconsistent_triplets(self):
      obj_file = "\n".join(["f 2//1 3/1 4/1/2"])
      with NamedTemporaryFile(mode="w", suffix=".obj") as f:
          f.write(obj_file)
          f.flush()
  
          with self.assertRaises(ValueError) as err:
              load_obj(Path(f.name))
          self.assertTrue(
              "Vertex properties are inconsistent" in str(err.exception)
          )
  
imports: import os
  import unittest
  import warnings
  from collections import Counter
  from io import StringIO
  from pathlib import Path
  from tempfile import NamedTemporaryFile, TemporaryDirectory
  import torch
  from iopath.common.file_io import PathManager
  from pytorch3d.io import IO, load_obj, load_objs_as_meshes, save_obj
  from pytorch3d.io.mtl_io import _bilinear_interpolation_grid_sample, _bilinear_interpolation_vectorized, _parse_mtl
  from pytorch3d.renderer import TexturesAtlas, TexturesUV, TexturesVertex
  from pytorch3d.structures import join_meshes_as_batch, Meshes
  from pytorch3d.utils import torus
  from .common_testing import get_pytorch3d_dir, get_tests_dir, load_rgb_image, TestCaseMixin
label_desc: Use image node_id 9 for calling the TestMeshObjIO obj's underlying member method code with example usage: obj.test_load_obj_error_inconsistent_triplets() without return types