code: def test_callable(self):
      class TestClass(object):
          def __call__(self):
              pass
  
      decorator_utils.validate_callable(TestClass(), "test")
  
imports: import functools
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.util import decorator_utils
label_desc: Use image node_id 3 for calling the ValidateCallableTest obj's underlying member method code with example usage: obj.test_callable() without return types