code: def test_getitem(self):
      N = 5
      V = 20
      F = 10
      source = {"atlas": torch.randn(size=(N, F, 4, 4, 3))}
      tex = TexturesAtlas(atlas=source["atlas"])
  
      verts = torch.rand(size=(N, V, 3))
      faces = torch.randint(size=(N, F, 3), high=V)
      meshes = Meshes(verts=verts, faces=faces, textures=tex)
  
      tryindex(self, 2, tex, meshes, source)
      tryindex(self, slice(0, 2, 1), tex, meshes, source)
      index = torch.tensor([1, 0, 1, 0, 0], dtype=torch.bool)
      tryindex(self, index, tex, meshes, source)
      index = torch.tensor([0, 0, 0, 0, 0], dtype=torch.bool)
      tryindex(self, index, tex, meshes, source)
      index = torch.tensor([1, 2], dtype=torch.int64)
      tryindex(self, index, tex, meshes, source)
      tryindex(self, [2, 4], tex, meshes, source)
  
imports: import unittest
  import torch
  import torch.nn.functional
  from pytorch3d.renderer.mesh.rasterizer import Fragments
  from pytorch3d.renderer.mesh.textures import _list_to_padded_wrapper, TexturesAtlas, TexturesUV, TexturesVertex
  from pytorch3d.renderer.mesh.utils import pack_rectangles, pack_unique_rectangles, Rectangle
  from pytorch3d.structures import list_to_packed, Meshes, packed_to_list
  from .common_testing import TestCaseMixin
  from .test_meshes import init_mesh
label_desc: Use image node_id 9 for calling the TestTexturesAtlas obj's underlying member method code with example usage: obj.test_getitem() without return types