spelling fix (#17911)

diff --git a/tensorflow/contrib/data/python/ops/grouping.py b/tensorflow/contrib/data/python/ops/grouping.py
index a19be22..ae10d2e 100644 (file)
--- a/tensorflow/contrib/data/python/ops/grouping.py
+++ b/tensorflow/contrib/data/python/ops/grouping.py
@@ -42,7 +42,7 @@ def group_by_window(key_func,
   This transformation maps each consecutive element in a dataset to a key
   using `key_func` and groups the elements by key. It then applies
   `reduce_func` to at most `window_size_func(key)` elements matching the same
-  key. All execpt the final window for each key will contain
+  key. All except the final window for each key will contain
   `window_size_func(key)` elements; the final window may be smaller.
 
   You may provide either a constant `window_size` or a window size determined by