code: def testRegression(self):
      result = RMS()([3, 7.32, -45, 2, -1.453, 0])
      self.assertAlmostEqual(result, 18.680174914420192)
  
imports: from essentia_test import *
label_desc: Use image node_id 3 for calling the TestRMS obj's underlying member method code with example usage: obj.testRegression() without return types