From 55e11e21cbf39fe5fdc0792562a0b7085b12cdc0 Mon Sep 17 00:00:00 2001
From: fengjiayi <fengjiayi@baidu.com>
Date: Tue, 6 Mar 2018 19:34:49 +0800
Subject: [PATCH] fix_a_bug

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

diff --git a/python/paddle/fluid/backward.py b/python/paddle/fluid/backward.py
index e02245d05dd..09d137c9017 100644
--- a/python/paddle/fluid/backward.py
+++ b/python/paddle/fluid/backward.py
@@ -486,7 +486,7 @@ def append_backward(loss, parameter_list=None, no_grad_set=None,
     params_and_grads = []
     for param in parameters:
         if param not in grad_info_map:
-            raise ValueError("param %s is not in map" % param)
+            continue
         grad_info = grad_info_map[param]
         grad_block = grad_info[1]
         if not grad_block.has_var(grad_info[0]):
-- 
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