From bf2d15d4eb027a10f977669d73db76484d267714 Mon Sep 17 00:00:00 2001
From: Ning Zhou <ningzhou.cn@gmail.com>
Date: Mon, 29 May 2017 08:46:01 -0700
Subject: [PATCH] correct a tiny error

---
 beginner_source/blitz/autograd_tutorial.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/beginner_source/blitz/autograd_tutorial.py b/beginner_source/blitz/autograd_tutorial.py
index 692ee6f79fc..c8e22bdd39b 100644
--- a/beginner_source/blitz/autograd_tutorial.py
+++ b/beginner_source/blitz/autograd_tutorial.py
@@ -89,7 +89,7 @@
 # You should have got a matrix of ``4.5``. Let’s call the ``out``
 # *Variable* “:math:`o`”.
 # We have that :math:`o = \frac{1}{4}\sum_i z_i`,
-# :math:`z_i = 3(x_i+2)^2` and :math:`z_i\bigr\rvert_{x_i=1} = 27`.
+# :math:`z_i = 3(x_i+2)^2` and :math:`z_i\bigr\rvert_{x_i=1} = 18`.
 # Therefore,
 # :math:`\frac{\partial o}{\partial x_i} = \frac{3}{2}(x_i+2)`, hence
 # :math:`\frac{\partial o}{\partial x_i}\bigr\rvert_{x_i=1} = \frac{9}{2} = 4.5`.