code: def test_results(self):
      ann = np.vstack((ANNOTATIONS, ANNOTATIONS[2]))
      notes = remove_duplicate_notes(ann)
      self.assertTrue(np.allclose(notes, ANNOTATIONS))
  
imports: from __future__ import absolute_import, division, print_function
  import math
  import unittest
  from madmom.evaluation.notes import *
  from .None import ANNOTATIONS_PATH, DETECTIONS_PATH
label_desc: Use image node_id 2 for calling the TestRemoveDuplicateNotesFunction obj's underlying member method code with example usage: obj.test_results() without return types