From 71bd014d2e7ac84222af7252c6fea828aee40c7b Mon Sep 17 00:00:00 2001
From: xiaoting <31891223+tink2123@users.noreply.github.com>
Date: Mon, 29 Apr 2019 14:23:04 +0800
Subject: [PATCH] modified lrn formula (#840)

---
 doc/fluid/api_cn/layers_cn.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/fluid/api_cn/layers_cn.rst b/doc/fluid/api_cn/layers_cn.rst
index 3e40c175a1244..7781e67a151e7 100644
--- a/doc/fluid/api_cn/layers_cn.rst
+++ b/doc/fluid/api_cn/layers_cn.rst
@@ -5412,7 +5412,7 @@ lrn
 
 .. math::
 
-    Output(i,x,y) = Input(i,x,y)/\left ( k+\alpha \sum_{j=max(0,c-n/2)}^{min(C,c+n/2)}(Input(j,x,y))^2 \right )^\beta
+    Output(i,x,y) = Input(i,x,y)/\left ( k+\alpha \sum_{j=max(0,i-n/2)}^{min(C-1,i+n/2)}(Input(j,x,y))^2 \right )^\beta
 
 在以上公式中：
   - :math:`n` ：累加的通道数