Merge pull request #4141 from PaddlePaddle/revert-4138-feature/do_not_invoke_gpu_method_when_use_gpu_off

Revert "Do not invoke GPU method when use_gpu=false"

paddle/gserver/gradientmachines/RecurrentGradientMachine.cpp

@@ -18,7 +18,6 @@ limitations under the License. */
 #include <cmath>
 #include <functional>
 #include <limits>
-#include <memory>
 #include "NeuralNetwork.h"
 #include "paddle/gserver/layers/AgentLayer.h"
 #include "paddle/utils/Flags.h"
@@ -430,11 +429,7 @@ void RecurrentGradientMachine::reorganizeInput(PassType passType) {
   }
 
   {
-    std::unique_ptr<AsyncGpuBlock> asyncBlock;
-
-    if (useGpu_) {
-      asyncBlock.reset(new AsyncGpuBlock());
-    }
+    AsyncGpuBlock asyncGpuBlock;
 
     // inFrameLine select rows in real layer one time
     for (size_t i = 0; i < inFrameLines_.size(); i++) {