From 91ba75000c9387f648f823a43242acd4e865026e Mon Sep 17 00:00:00 2001
From: zhoukunsheng <zhoukunsheng@baidu.com>
Date: Fri, 29 Mar 2019 15:54:54 +0800
Subject: [PATCH] fix type conversion problem in rsqrt functor

---
 paddle/fluid/operators/activation_op.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/paddle/fluid/operators/activation_op.h b/paddle/fluid/operators/activation_op.h
index 1839c7e9bce..292505ae6c3 100644
--- a/paddle/fluid/operators/activation_op.h
+++ b/paddle/fluid/operators/activation_op.h
@@ -477,7 +477,7 @@ struct RsqrtGradFunctor : public BaseActivationFunctor<T> {
   template <typename Device, typename X, typename Out, typename dOut,
             typename dX>
   void operator()(Device d, X x, Out out, dOut dout, dX dx) const {
-    dx.device(d) = static_cast<T>(-0.5) * dout * out.pow(3);
+    dx.device(d) = static_cast<T>(-0.5) * dout * out * out * out;
   }
 };
 
-- 
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