From 171a0e2b42e1dea669056bbc6093e572e1c88e0a Mon Sep 17 00:00:00 2001
From: tensor-tang <tangjian03@baidu.com>
Date: Mon, 13 Aug 2018 18:01:43 +0800
Subject: [PATCH] add some comment

---
 paddle/fluid/operators/gru_op.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/paddle/fluid/operators/gru_op.cc b/paddle/fluid/operators/gru_op.cc
index 2b5094925..087f903a8 100644
--- a/paddle/fluid/operators/gru_op.cc
+++ b/paddle/fluid/operators/gru_op.cc
@@ -276,6 +276,7 @@ class GRUCPUKernel : public framework::OpKernel<T> {
         context.Attr<std::string>("gate_activation"));
 
 #ifdef PADDLE_WITH_MKLML
+    // use MKL packed to speedup GEMM
     if (FLAGS_paddle_num_threads >= 4) {
       auto blas = math::GetBlas<DeviceContext, T>(dev_ctx);
       T* packed_gate = blas.GEMM_ALLOC(CblasBMatrix, 1 /*height of C*/,
-- 
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