From be218bfac4ab4232d56e407b22ea581cc7b1f8e5 Mon Sep 17 00:00:00 2001
From: fengjiayi <fengjiayi@baidu.com>
Date: Fri, 5 Jan 2018 19:16:35 +0800
Subject: [PATCH] fix bug

---
 python/paddle/v2/fluid/backward.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/paddle/v2/fluid/backward.py b/python/paddle/v2/fluid/backward.py
index 33f6c103845..f095d414cb9 100644
--- a/python/paddle/v2/fluid/backward.py
+++ b/python/paddle/v2/fluid/backward.py
@@ -192,7 +192,7 @@ def _append_backward_ops_(target,
     """
     if callback is None:
 
-        def empty_callback(block):
+        def empty_callback(block, context):
             pass
 
         callback = empty_callback
-- 
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