code: def testZero(self):
      model = join(testdata.models_dir, "crepe", "crepe-tiny-1.pb")
  
      sampleLength = 1024
      sampleRate = 16000
      hopMilliseconds = 10
      timestamps = int(
          numpy.ceil(
              sampleLength / (sampleRate * hopMilliseconds / 1000)
          )
      )
  
      zeros = numpy.zeros(sampleLength, dtype="float32")
      _, frequency, confidence, _ = PitchCREPE(
          graphFilename=model, hopSize=hopMilliseconds
      )(zeros)
  
      self.assertEqualVector(frequency, numpy.zeros(timestamps))
      self.assertEqualVector(confidence, numpy.zeros(timestamps))
  
imports: from essentia_test import *
label_desc: Use image node_id 5 for calling the TestPitchCREPE obj's underlying member method code with example usage: obj.testZero() without return types