From abcefe721117010277fbffb1e159acf2228f08dc Mon Sep 17 00:00:00 2001
From: qingqing01 <dangqingqing@baidu.com>
Date: Thu, 14 Feb 2019 22:39:55 +0800
Subject: [PATCH] Fix debug mode in fake_quantize_op (#15693)

* Fix debug mode in fake_quantize_op
* Remove template specialization
---
 paddle/fluid/operators/fake_quantize_op.cc | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/paddle/fluid/operators/fake_quantize_op.cc b/paddle/fluid/operators/fake_quantize_op.cc
index 8aff9111412..d51eb054a96 100644
--- a/paddle/fluid/operators/fake_quantize_op.cc
+++ b/paddle/fluid/operators/fake_quantize_op.cc
@@ -21,26 +21,17 @@ limitations under the License. */
 namespace paddle {
 namespace operators {
 
-template <typename T, int MajorType = Eigen::RowMajor,
-          typename IndexType = Eigen::DenseIndex>
-using EigenVectorArrayMap =
-    Eigen::TensorMap<Eigen::Tensor<T, 1, MajorType, IndexType>>;
-
-template <typename T, int MajorType = Eigen::RowMajor,
-          typename IndexType = Eigen::DenseIndex>
-using ConstEigenVectorArrayMap =
-    Eigen::TensorMap<const Eigen::Tensor<T, 1, MajorType, IndexType>>;
+template <typename T>
+struct Compare {
+ public:
+  bool operator()(const T a, const T b) { return (std::abs(a) < std::abs(b)); }
+};
 
 template <typename T>
 struct FindAbsMaxFunctor<platform::CPUDeviceContext, T> {
   void operator()(const platform::CPUDeviceContext& ctx, const T* in,
                   const int num, T* out) {
-    Eigen::DSizes<Eigen::DenseIndex, 1> idim(num);
-    Eigen::DSizes<Eigen::DenseIndex, 1> odim(1);
-    Eigen::TensorMap<Eigen::Tensor<const T, 1, Eigen::RowMajor>> in_e(in, idim);
-    Eigen::TensorMap<Eigen::Tensor<T, 1, Eigen::RowMajor>> out_e(out, odim);
-
-    out_e = in_e.abs().maximum();
+    *out = *(std::max_element(in + 0, in + num, Compare<T>()));
   }
 };
 
-- 
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