code: def testRational(self):
      input = [3.1459, 0.4444, 0.00002]
      self.assertAlmostEqual(PowerMean()(input), 1.19677333)
      self.assertAlmostEqual(PowerMean(power=0)(input), 0.0303516976)
      self.assertAlmostEqual(
          PowerMean(power=-5.1)(input), 2.48075104e-5
      )
      self.assertAlmostEqual(PowerMean(power=2.3)(input), 1.96057772)
  
file_path: essentia/test/src/unittests/stats/test_powermean.py
imports: from essentia_test import *
label_desc: Use image node_id 6 for calling the TestPowerMean obj's underlying member method code with example usage: obj.testRational() without return types