code: def test_simple(self):
      ind_source = torch.tensor([1, 2, 5])
      ind_target = torch.tensor([0, 5, 6])
      data_s = Data(pos=torch.randn(3, 3), origin_id=ind_source)
      data_t = Data(pos=torch.randn(3, 3), origin_id=ind_target)
      pair = torch.tensor([[0, 2], [1, 3], [2, 0], [3, 1]])
  
      res = tracked_matches(data_s, data_t, pair)
      expected = np.array([[1, 0]])
      npt.assert_array_almost_equal(
          res.detach().cpu().numpy(), expected
      )
  
file_path: torch-points3d/test/test_ind_tracker.py
imports: import os
  import sys
  import numpy
  import torch
  import unittest
  import h5py
  import numpy.testing
  import numpy.matlib
  from torch_geometric.data import Data
  from torch_points3d.datasets.registration.utils import tracked_matches
label_desc: Use image node_id 1 for calling the TestTrackedMatches obj's underlying member method code with example usage: obj.test_simple() without return types