code: def test_forward(self):
      pred_track = np.random.randn(5, 7)
  
      # set frame_id and target_id
      pred_track[:, 0] = np.array([1, 2, 5, 6, 7])
      pred_track[:, 1] = 1
  
      interpolation = TASK_UTILS.build(self.cfg)
      linked_track = interpolation.forward(pred_track)
      assert isinstance(linked_track, np.ndarray)
      assert linked_track.shape == (5, 7)
  
file_path: mmdetection/tests/test_models/test_task_modules/test_track/test_interpolation.py
imports: from unittest import TestCase
  import numpy
  from mmengine.registry import init_default_scope
  from mmdet.registry import TASK_UTILS
label_desc: Use image node_id 3 for calling the TestInterpolateTracklets obj's underlying member method code with example usage: obj.test_forward() without return types