code: def test_heterogenous_verts_per_face(self):
      # The cube but where one face is pentagon not square.
      text = CUBE_PLY_LINES.copy()
      text[-1] = "5 3 7 4 0 1"
      stream = StringIO("\n".join(text))
      verts, faces = load_ply(stream)
      self.assertEqual(verts.shape, (8, 3))
      self.assertEqual(faces.shape, (13, 3))
  
imports: import itertools
  import struct
  import unittest
  from io import BytesIO, StringIO
  from tempfile import NamedTemporaryFile, TemporaryFile
  import numpy
  import pytorch3d.io.ply_io
  import torch
  from iopath.common.file_io import PathManager
  from pytorch3d.io import IO
  from pytorch3d.io.ply_io import load_ply, save_ply
  from pytorch3d.renderer.mesh import TexturesVertex
  from pytorch3d.structures import Meshes, Pointclouds
  from pytorch3d.utils import torus
  from .common_testing import get_tests_dir, TestCaseMixin
label_desc: Use image node_id 4 for calling the TestMeshPlyIO obj's underlying member method code with example usage: obj.test_heterogenous_verts_per_face() without return types