code: def testUnwrapReturnsFinalFunctionAsTarget(self):
      self.assertEqual((4 + 1) * 2, test_decorated_function(4))
      _, target = tf_decorator.unwrap(test_decorated_function)
      self.assertTrue(tf_inspect.isfunction(target))
      self.assertEqual(4 * 2, target(4))
  
imports: import functools
  import inspect
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.util import tf_decorator
  from tensorflow.python.util import tf_inspect
label_desc: Use image node_id 3 for calling the TfDecoratorUnwrapTest obj's underlying member method code with example usage: obj.testUnwrapReturnsFinalFunctionAsTarget() without return types