diff --git a/beginner_source/examples_autograd/polynomial_custom_function.py b/beginner_source/examples_autograd/polynomial_custom_function.py
index 4a0ea4fc9d8..985d0c8e29a 100755
--- a/beginner_source/examples_autograd/polynomial_custom_function.py
+++ b/beginner_source/examples_autograd/polynomial_custom_function.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-r"""
+"""
 PyTorch: Defining New autograd Functions
 ----------------------------------------