remove unused method

paddle/operators/math/math_function.cc

@@ -134,17 +134,6 @@ void matmul<platform::CPUPlace, double>(
 
 template struct SetConstant<platform::CPUPlace, float>;
 
-namespace detail {
-size_t FindPos(const std::vector<int64_t>& rows, int64_t value) {
-  for (size_t i = 0; i < rows.size(); i++) {
-    if (rows[i] == value) {
-      return i;
-    }
-  }
-  return 0;
-}
-}  // namespace detail
-
 template <typename T>
 struct SelectedRowsAdd<platform::CPUPlace, T> {
   void operator()(const platform::DeviceContext& context,

paddle/operators/math/math_function_test.cc

@@ -1,5 +1,4 @@
 #include "paddle/operators/math/math_function.h"
-#include "glog/logging.h"
 #include "gtest/gtest.h"
 
 #ifdef PADDLE_WITH_CUDA