Better error message when non kwargs are provided to raw ops

PiperOrigin-RevId: 236142699

tensorflow/python/ops/raw_ops_test.py

@@ -30,7 +30,7 @@ class RawOpsTest(test.TestCase):
 
   def testSimple(self):
 
-    with self.assertRaises(TypeError):
+    with self.assertRaisesRegexp(TypeError, "only takes keyword args"):
       _ = gen_math_ops.Add(1., 1.)
 
     x = constant_op.constant(1)

tensorflow/python/util/tf_export.py

@@ -382,7 +382,13 @@ class api_export(object):  # pylint: disable=invalid-name
 
 def kwarg_only(f):
   """A wrapper that throws away all non-kwarg arguments."""
-  def wrapper(**kwargs):
+
+  def wrapper(*args, **kwargs):
+    if args:
+      raise TypeError(
+          '{} only takes keyword args. The following args were provided: {}. '
+          'Please pass these args as kwargs instead.'
+          .format(f.__name__, args))
     return f(**kwargs)
 
   return tf_decorator.make_decorator(