code: def test_function(self):
      decorator_utils.validate_callable(_test_function, "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 1 for calling the ValidateCallableTest obj's underlying member method code with example usage: obj.test_function() without return types