code: def test_types(self):
      self.assertIsInstance(self.processor.correct, bool)
      self.assertIsInstance(self.processor.st, BeatStateSpace)
      self.assertIsInstance(self.processor.tm, BeatTransitionModel)
      self.assertIsInstance(
          self.processor.om, RNNBeatTrackingObservationModel
      )
      self.assertIsInstance(self.processor.hmm, HiddenMarkovModel)
  
imports: from __future__ import absolute_import, division, print_function
  import unittest
  from os.path import join
  from madmom.ml.hmm import HiddenMarkovModel
  from madmom.audio.signal import FramedSignal
  from madmom.features import Activations
  from madmom.features.beats import *
  from madmom.features.beats_hmm import *
  from .None import AUDIO_PATH, ACTIVATIONS_PATH
label_desc: Use image node_id 2 for calling the TestDBNBeatTrackingProcessorClass obj's underlying member method code with example usage: obj.test_types() without return types