code: def test_select_sevenths(self):
      sel = select_sevenths(self.ev_det)
      self.assertTrue(
          (
              sel
              == np.array(
                  [
                      True,
                      True,
                      True,
                      False,
                      True,
                      True,
                      True,
                      True,
                      True,
                      False,
                  ]
              )
          ).all()
      )
  
imports: from __future__ import absolute_import, division, print_function
  import unittest
  from os.path import join
  from madmom.evaluation.chords import *
  from .None import ANNOTATIONS_PATH, DETECTIONS_PATH
label_desc: Use image node_id 9 for calling the TestChordEvaluation obj's underlying member method code with example usage: obj.test_select_sevenths() without return types