class_docstr: Test TransRAC module
code: def test_transrac(self):
      dummy_video = torch.rand(1, 3, 4, 200, 200)  # (bcthw)
      backbone = video_swin_transformer.create_model(
          "swin_t_k400_1k", pretrained=False
      )
      model = TransRAC(backbone=backbone, num_frames=4)
      out, out_matrix = model(dummy_video)
      self.assertTrue(out.shape == (1, 4))
      self.assertTrue(out_matrix.shape == (1, 12, 4, 4))
  
imports: import unittest
  import torch
  from towhee.models import video_swin_transformer
  from towhee.models.transrac import TransRAC
label_desc: Use image node_id 1 for calling the TestTransRAC obj's underlying member method code with example usage: obj.test_transrac() without return types