From 14a32bf0c471ffee0e76950f35262c7aeb5ec7fe Mon Sep 17 00:00:00 2001
From: Yihua Xu <yihua.xu@intel.com>
Date: Fri, 7 Jun 2019 13:53:59 +0800
Subject: [PATCH] Fix the accuracy issue while using float precision to get the
 scale. (#17884)

test=develop
---
 paddle/fluid/operators/mkldnn/conv_mkldnn_op.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/paddle/fluid/operators/mkldnn/conv_mkldnn_op.cc b/paddle/fluid/operators/mkldnn/conv_mkldnn_op.cc
index 01540e0ef28..25bd6a9ead2 100644
--- a/paddle/fluid/operators/mkldnn/conv_mkldnn_op.cc
+++ b/paddle/fluid/operators/mkldnn/conv_mkldnn_op.cc
@@ -429,7 +429,9 @@ class ConvMKLDNNOpKernel : public paddle::framework::OpKernel<T> {
                                // scale couldn't be calculated
         else
           output_shift_scale[i] =
-              scale_out_data / (scale_in_data * scale_weights_data[i]);
+              static_cast<float>(static_cast<double>(scale_out_data) /
+                                 (static_cast<double>(scale_in_data) *
+                                  static_cast<double>(scale_weights_data[i])));
       }
 
       auto user_src_md =
-- 
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