code: def testConstantInput(self):
      onesOSS = ones(1024)
      onespositions = ones(1024)
      lag = PercivalEvaluatePulseTrains()(onesOSS, onespositions)
      self.assertEqual(1.0, lag)
  
file_path: essentia/test/src/unittests/rhythm/test_percivalevaluatepulsetrains.py
imports: from essentia_test import *
  from essentia.standard import MonoLoader, PercivalEvaluatePulseTrains, HarmonicBpm, FrequencyBands, NoveltyCurve
label_desc: Use image node_id 3 for calling the TestPercivalEvaluatePulseTrains obj's underlying member method code with example usage: obj.testConstantInput() without return types