code: def test_one_different_id(self):
      sizes = [Rectangle(xsize=61, ysize=82, identifier=220)] * 3
      sizes.extend([Rectangle(xsize=61, ysize=82, identifier=284)] * 3)
      total_size, locations = pack_unique_rectangles(sizes)
      self.assertEqual(total_size, (82, 122))
      self.assertEqual(len(locations), 6)
      for i, (x, y, is_flipped, is_first) in enumerate(locations):
          self.assertTrue(is_flipped)
          self.assertEqual(is_first, i % 3 == 0)
          self.assertEqual(x, 0)
          if i < 3:
              self.assertEqual(y, 61)
          else:
              self.assertEqual(y, 0)
  
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 7 for calling the TestRectanglePacking obj's underlying member method code with example usage: obj.test_one_different_id() without return types