code: def testRegression(self):
      input = [45, 78, 1, -5, -0.1125, 1.236, 10.25, 100, 9, -78]
      self.assertAlmostEqual(
          Loudness()(input), 870.22171051882947, 1e-6
      )
  
imports: from essentia_test import *
label_desc: Use image node_id 4 for calling the TestLoudness obj's underlying member method code with example usage: obj.testRegression() without return types