code: def test_load_open3d_mesh(self):
      # Header based on issue #1104
      header = "\n".join(
          [
              "ply",
              "format binary_little_endian 1.0",
              "comment Created by Open3D",
              "element vertex 3",
              "property double x",
              "property double y",
              "property double z",
              "property double nx",
              "property double ny",
              "property double nz",
              "property uchar red",
              "property uchar green",
              "property uchar blue",
              "element face 1",
              "property list uchar uint vertex_indices",
              "end_header",
              "",
          ]
      ).encode("ascii")
      vert_data = struct.pack("<" + "ddddddBBB" * 3, *range(9 * 3))
      face_data = struct.pack("<" + "BIII", 3, 0, 1, 2)
      io = IO()
      with NamedTemporaryFile(mode="wb", suffix=".ply") as f:
          f.write(header)
          f.write(vert_data)
          f.write(face_data)
          f.flush()
          mesh = io.load_mesh(f.name)
  
      self.assertClose(mesh.faces_padded(), torch.arange(3)[None, None])
      self.assertClose(
          mesh.verts_padded(),
          (torch.arange(3) + 9.0 * torch.arange(3)[:, None])[None],
      )
  
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 17 for calling the TestMeshPlyIO obj's underlying member method code with example usage: obj.test_load_open3d_mesh() without return types