code: def _createPulseTrainCombo(self):
      impulseTrain90 = self._pulseTrain(
          bpm=90.0, sr=44100.0, offset=0.0, dur=20.0
      )
      impulseTrain140 = self._pulseTrain(
          bpm=140.0, sr=44100.0, offset=0.1, dur=10.0
      )
      impulseTrain200 = self._pulseTrain(
          bpm=200.0, sr=44100.0, offset=0.2, dur=10.0
      )
      impulseTrain200b = self._pulseTrain(
          bpm=200.0, sr=44100.0, offset=0.0, dur=25.0
      )
      # Result is a combined impulse train with 90-140-200-bpm and different offsets.
      return (
          impulseTrain90
          + impulseTrain140
          + impulseTrain200
          + impulseTrain200b
      )
  
imports: from essentia_test import *
  from essentia.standard import MonoLoader, RhythmExtractor2013
  from math import fabs
  from math import floor
label_desc: Use image node_id 12 for calling the TestRhythmExtractor2013 obj's underlying member method code with example usage: obj._createPulseTrainCombo() and returns: unknown