code: def test_bound_method(self):
      class Foo(object):
          def bar(self, a, b):
              return a + b
  
      self.assertEqual(("a", "b"), function_utils.fn_args(Foo().bar))
  
imports: import functools
  from tensorflow.python.platform import test
  from tensorflow.python.util import function_utils
label_desc: Use image node_id 3 for calling the FnArgsTest obj's underlying member method code with example usage: obj.test_bound_method() and returns: unknown