code: def testRegression(self):
      self.assertAlmostEqual(GeometricMean()([2]), 2)
      self.assertAlmostEqual(GeometricMean()([0.25, 0.5, 1]), 0.5)
      self.assertAlmostEqual(
          GeometricMean()([32, 16, 2, 4, 8]), 8, 2e-7
      )
  
imports: from essentia_test import *
label_desc: Use image node_id 5 for calling the TestGeometricMean obj's underlying member method code with example usage: obj.testRegression() without return types