Follow comments.

paddle/function/CMakeLists.txt

@@ -5,7 +5,9 @@ list(APPEND h_files Function.h)
 list(APPEND cpp_files Function.cpp)
 list(APPEND cpp_files BufferArg.cpp)
 list(APPEND cpp_files GemmFunctor.cpp)
-list(APPEND cpp_files EigenGemm.cpp)
+if(USE_EIGEN_FOR_BLAS)
+  list(APPEND cpp_files EigenGemm.cpp)
+endif(USE_EIGEN_FOR_BLAS)
 
 if(WITH_GPU)
     file(GLOB cu_files . *OpGpu.cu)

paddle/function/EigenGemm.cpp

@@ -77,8 +77,7 @@ struct EigenBlasGemm {
     } else if (alpha == T(1) && beta == T(1)) {
       c.device(device) += a.contract(b, dims);
     } else {
-      c.device(device) =
-          c.constant(alpha) * a.contract(b, dims) + c.constant(beta) * c;
+      c.device(device) = alpha * a.contract(b, dims) + beta * c;
     }
   }
 };