code: def _write_faces(
      f,
      faces: torch.Tensor,
      faces_uvs: Optional[torch.Tensor],
      faces_normals_idx: Optional[torch.Tensor],
  ) -> None:
      F, P = faces.shape
      for i in range(F):
          if faces_normals_idx is not None:
              if faces_uvs is not None:
                  # Format faces as {verts_idx}/{verts_uvs_idx}/{verts_normals_idx}
                  face = [
                      "%d/%d/%d"
                      % (
                          faces[i, j] + 1,
                          faces_uvs[i, j] + 1,
                          faces_normals_idx[i, j] + 1,
                      )
                      for j in range(P)
                  ]
              else:
                  # Format faces as {verts_idx}//{verts_normals_idx}
                  face = [
                      "%d//%d"
                      % (faces[i, j] + 1, faces_normals_idx[i, j] + 1)
                      for j in range(P)
                  ]
          elif faces_uvs is not None:
              # Format faces as {verts_idx}/{verts_uvs_idx}
              face = [
                  "%d/%d" % (faces[i, j] + 1, faces_uvs[i, j] + 1)
                  for j in range(P)
              ]
          else:
              face = ["%d" % (faces[i, j] + 1) for j in range(P)]
  
          if i + 1 < F:
              f.write("f %s\n" % " ".join(face))
          else:
              # No newline at the end of the file.
              f.write("f %s" % " ".join(face))
  
imports: import os
  import warnings
  from collections import namedtuple
  from pathlib import Path
  from typing import List, Optional
  import numpy
  import torch
  from iopath.common.file_io import PathManager
  from PIL import Image
  from pytorch3d.common.datatypes import Device
  from pytorch3d.io.mtl_io import load_mtl, make_mesh_texture_atlas
  from pytorch3d.io.utils import _check_faces_indices, _make_tensor, _open_file, PathOrStr
  from pytorch3d.renderer import TexturesAtlas, TexturesUV
  from pytorch3d.structures import join_meshes_as_batch, Meshes
  from .pluggable_formats import endswith, MeshFormatInterpreter
label_desc: Use image node_id 11 for calling a global function with example usage: _write_faces(f, faces, faces_uvs, faces_normals_idx) without return types