code: def test_comparison(self):
      self.assertTrue(self.e1 < self.e2)
      self.assertTrue(self.e1 < self.e3)
      self.assertTrue(self.e1 < self.e4)
      self.assertTrue(self.e4 < self.e2)
  
imports: from __future__ import absolute_import, division, print_function
  import os
  import tempfile
  import unittest
  from os.path import join
  from madmom.utils.midi import *
  from .None import ANNOTATIONS_PATH
label_desc: Use image node_id 3 for calling the TestEventsClass obj's underlying member method code with example usage: obj.test_comparison() without return types