From 762160bd8c3850a15a87467dd33edfd272469bfe Mon Sep 17 00:00:00 2001
From: qiaolongfei <qiaolongfei@baidu.com>
Date: Tue, 19 Jun 2018 23:42:57 +0800
Subject: [PATCH] fix concat grad kernel

---
 paddle/fluid/operators/math/concat.cu | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/paddle/fluid/operators/math/concat.cu b/paddle/fluid/operators/math/concat.cu
index 6205f3cd85c..5863d74fca2 100644
--- a/paddle/fluid/operators/math/concat.cu
+++ b/paddle/fluid/operators/math/concat.cu
@@ -209,7 +209,7 @@ class ConcatGradFunctor<platform::CUDADeviceContext, T> {
 
     outputs_cols[0] = 0;
     for (int i = 0; i < o_num; ++i) {
-      int t_col = outputs->at(i)->numel() / out_row;
+      int t_col = ref_inputs.at(i)->numel() / out_row;
       if (sameShape) {
         if (t_col != out0_col) sameShape = false;
       }
-- 
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