From 98a2179f80f587ab50d12f0bb41b8110306906ba Mon Sep 17 00:00:00 2001
From: qiaolongfei <qiaolongfei@baidu.com>
Date: Fri, 27 Apr 2018 13:45:01 +0800
Subject: [PATCH] fix ListenAndServ op

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

diff --git a/python/paddle/fluid/layers/io.py b/python/paddle/fluid/layers/io.py
index e8eff33bd1..acfad45704 100644
--- a/python/paddle/fluid/layers/io.py
+++ b/python/paddle/fluid/layers/io.py
@@ -170,7 +170,7 @@ class ListenAndServ(object):
                 'OptimizeBlock': current_block,
                 'PrefetchBlock': empty_block,
                 'sync_mode': True,  # did not support async now in layers
-                'grad_to_block_id': []
+                'grad_to_block_id': [""]
             })
 
 
-- 
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