code: def testLn(self):
      self.assertAlmostEqualVector(
          UnaryOperator(type="ln")(self.testInput),
          [
              0,
              0.693147181,
              1.098612289,
              1.386294361,
              1.223775432,
              -69.07755279,
              11.513265407,
          ],
      )
  
imports: from essentia_test import *
label_desc: Use image node_id 8 for calling the TestUnaryOperator obj's underlying member method code with example usage: obj.testLn() without return types