From 93539093f4727d4028ca7e592f5fa4f7abdb8bc3 Mon Sep 17 00:00:00 2001
From: xuwei06 <xuwei06@baidu.com>
Date: Wed, 2 Aug 2017 11:28:25 -0700
Subject: [PATCH] Allow boot_bias for recurrent group to be static

---
 paddle/gserver/gradientmachines/RecurrentGradientMachine.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/paddle/gserver/gradientmachines/RecurrentGradientMachine.cpp b/paddle/gserver/gradientmachines/RecurrentGradientMachine.cpp
index f98bf95064f..157b1ab4516 100644
--- a/paddle/gserver/gradientmachines/RecurrentGradientMachine.cpp
+++ b/paddle/gserver/gradientmachines/RecurrentGradientMachine.cpp
@@ -184,7 +184,7 @@ public:
   }
 
   void backward(const UpdateCallback& callback) override {
-    if (biases_) {
+    if (biases_ && biases_->getWGrad()) {
       backwardActivation();
       biases_->getWGrad()->collectBias(*getOutputGrad(), 1);
       biases_->getParameterPtr()->incUpdate(callback);
-- 
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