code: def testRegression(self):
      signal = MonoLoader(
          filename=join(
              testdata.audio_dir,
              "generated",
              "doublesize",
              "sin_30_seconds.wav",
          ),
          sampleRate=44100,
      )()[:100000]
      expected = MonoLoader(
          filename=join(
              testdata.audio_dir,
              "generated",
              "doublesize",
              "sin_30_seconds_eqloud.wav",
          ),
          sampleRate=44100,
      )()[:100000]
  
      # assert on the difference of the signals here, because we want the absolute
      # difference, not a relative one
      self.assertAlmostEqualVector(
          EqualLoudness()(signal) - expected, zeros(len(expected)), 1e-4
      )
  
file_path: essentia/test/src/unittests/filters/test_equalloudness.py
imports: from essentia_test import *
label_desc: Use image node_id 5 for calling the TestEqualLoudness obj's underlying member method code with example usage: obj.testRegression() without return types