code: def clip_tri_by_plane(
      plane, n, tri_verts
  ) -> Union[List, torch.Tensor]:
      """
      Clip a trianglular face defined by tri_verts with a plane of inside "direction" n.
      This function computes whether the triangle has one or two
      or none points "outside" the plane.
      Args:
         plane: tensor of shape (4, 3) of the vertex coordinates of the plane
         n: tensor of shape (3,) of the unit "inside" direction of the plane
         tri_verts: tensor of shape (3, 3) of the vertex coordiantes of the the triangle faces
      Returns:
          tri_verts: tensor of shape (K, 3, 3) of the vertex coordinates of the triangles formed
              after clipping. All K triangles are now "inside" the plane.
      """
      if coplanar_tri_plane(tri_verts, plane, n):
          return tri_verts.view(1, 3, 3)
  
      v0, v1, v2 = tri_verts.unbind(0)
      isin0, _ = is_inside(plane, n, v0)
      isin1, _ = is_inside(plane, n, v1)
      isin2, _ = is_inside(plane, n, v2)
  
      if isin0 and isin1 and isin2:
          # all in, no clipping, keep the old triangle face
          return tri_verts.view(1, 3, 3)
      elif (not isin0) and (not isin1) and (not isin2):
          # all out, delete triangle
          return []
      else:
          if isin0:
              if isin1:  # (isin0, isin1, not isin2)
                  verts, faces = clip_tri_by_plane_oneout(
                      plane, n, v2, v0, v1
                  )
                  return verts[faces]
              elif isin2:  # (isin0, not isin1, isin2)
                  verts, faces = clip_tri_by_plane_oneout(
                      plane, n, v1, v0, v2
                  )
                  return verts[faces]
              else:  # (isin0, not isin1, not isin2)
                  verts, faces = clip_tri_by_plane_twoout(
                      plane, n, v1, v2, v0
                  )
                  return verts[faces]
          else:
              if isin1 and isin2:  # (not isin0, isin1, isin2)
                  verts, faces = clip_tri_by_plane_oneout(
                      plane, n, v0, v1, v2
                  )
                  return verts[faces]
              elif isin1:  # (not isin0, isin1, not isin2)
                  verts, faces = clip_tri_by_plane_twoout(
                      plane, n, v0, v2, v1
                  )
                  return verts[faces]
              elif isin2:  # (not isin0, not isin1, isin2)
                  verts, faces = clip_tri_by_plane_twoout(
                      plane, n, v0, v1, v2
                  )
                  return verts[faces]
  
      # Should not be reached
      return []
  
imports: import pickle
  import random
  import unittest
  from typing import List, Tuple, Union
  import torch
  import torch.nn.functional
  from pytorch3d.io import save_obj
  from pytorch3d.ops.iou_box3d import _box_planes, _box_triangles, box3d_overlap
  from pytorch3d.transforms.rotation_conversions import random_rotation
  from .common_testing import get_random_cuda_device, get_tests_dir, TestCaseMixin
label_desc: Use image node_id 14 for calling a global function with example usage: clip_tri_by_plane(plane, n, tri_verts) and returns: list, tri_verts, tri_verts, list, verts, verts, verts, verts, verts, verts