code: def save_ply(
      f,
      verts: torch.Tensor,
      faces: Optional[torch.LongTensor] = None,
      verts_normals: Optional[torch.Tensor] = None,
      ascii: bool = False,
      decimal_places: Optional[int] = None,
      path_manager: Optional[PathManager] = None,
  ) -> None:
      """
      Save a mesh to a .ply file.
  
      Args:
          f: File (or path) to which the mesh should be written.
          verts: FloatTensor of shape (V, 3) giving vertex coordinates.
          faces: LongTensor of shape (F, 3) giving faces.
          verts_normals: FloatTensor of shape (V, 3) giving vertex normals.
          ascii: (bool) whether to use the ascii ply format.
          decimal_places: Number of decimal places for saving if ascii=True.
          path_manager: PathManager for interpreting f if it is a str.
      """
  
      if len(verts) and not (verts.dim() == 2 and verts.size(1) == 3):
          message = "Argument 'verts' should either be empty or of shape (num_verts, 3)."
          raise ValueError(message)
  
      if (
          faces is not None
          and len(faces)
          and not (faces.dim() == 2 and faces.size(1) == 3)
      ):
          message = "Argument 'faces' should either be empty or of shape (num_faces, 3)."
          raise ValueError(message)
  
      if (
          verts_normals is not None
          and len(verts_normals)
          and not (
              verts_normals.dim() == 2
              and verts_normals.size(1) == 3
              and verts_normals.size(0) == verts.size(0)
          )
      ):
          message = "Argument 'verts_normals' should either be empty or of shape (num_verts, 3)."
          raise ValueError(message)
  
      if path_manager is None:
          path_manager = PathManager()
      with _open_file(f, path_manager, "wb") as f:
          _save_ply(
              f,
              verts=verts,
              faces=faces,
              verts_normals=verts_normals,
              verts_colors=None,
              ascii=ascii,
              decimal_places=decimal_places,
              colors_as_uint8=False,
          )
  
imports: import itertools
  import os
  import struct
  import sys
  import warnings
  from collections import namedtuple
  from dataclasses import asdict, dataclass
  from io import BytesIO, TextIOBase
  from typing import List, Optional, Tuple
  import numpy
  import torch
  from iopath.common.file_io import PathManager
  from pytorch3d.io.utils import _check_faces_indices, _make_tensor, _open_file, _read_image, PathOrStr
  from pytorch3d.renderer import TexturesUV, TexturesVertex
  from pytorch3d.structures import Meshes, Pointclouds
  from .pluggable_formats import endswith, MeshFormatInterpreter, PointcloudFormatInterpreter
label_desc: Use image node_id 19 for calling a global function with example usage: save_ply(f, verts, faces, verts_normals, ascii, decimal_places, path_manager) without return types