code: def testEmpty(self):
      # nothing should be computed and the resulting pool be empty
      pool = self.computeBpmHistogram([])
      self.assertEqualVector(pool.descriptorNames(), [])
  
file_path: essentia/test/src/unittests/rhythm/test_bpmhistogram.py
imports: from essentia_test import *
  import essentia
  from essentia import Pool
  from essentia.standard import *
  import essentia.streaming
  from math import ceil, fabs
  from numpy import argmax
label_desc: Use image node_id 8 for calling the TestBpmHistogram obj's underlying member method code with example usage: obj.testEmpty() without return types