code: def testRegression(self):
      # only testing that it yields valid result, but still need to check for
      # correct results.. no ground truth provided
      size = 20
      while size > 0:
          bands, bfcc = self.InitBFCC(size)(ones(1025))
          self.assertEqual(len(bfcc), size)
          self.assertEqual(len(bands), 40)
          self.assert_(not any(numpy.isnan(bfcc)))
          self.assert_(not any(numpy.isinf(bfcc)))
          size -= 1
  
file_path: essentia/test/src/unittests/spectral/test_bfcc.py
imports: from essentia_test import *
  from math import *
  import numpy
label_desc: Use image node_id 2 for calling the TestBFCC obj's underlying member method code with example usage: obj.testRegression() without return types