add note for use mkldnn

Author: tensor-tang

paddle/fluid/inference/api/analysis_predictor.cc

@@ -77,7 +77,7 @@ bool AnalysisPredictor::Init(
 
   OptimizeInferenceProgram();
   ctx_ = executor_->Prepare(*inference_program_, 0);
-  if (config_.use_mkldnn) {
+  if (config_._use_mkldnn) {
     executor_->EnableMKLDNN(*inference_program_);
   }
 

paddle/fluid/inference/api/api_impl.cc

@@ -106,7 +106,7 @@ bool NativePaddlePredictor::Init(
   }
 
   ctx_ = executor_->Prepare(*inference_program_, 0);
-  if (config_.use_mkldnn) {
+  if (config_._use_mkldnn) {
     executor_->EnableMKLDNN(*inference_program_);
   }
   executor_->CreateVariables(*inference_program_,

paddle/fluid/inference/api/paddle_inference_api.h

@@ -121,8 +121,8 @@ struct NativeConfig : public PaddlePredictor::Config {
   bool use_gpu{false};
   int device{0};
   float fraction_of_gpu_memory{-1.f};  // Negative to notify initialization.
-  // MKLDNN related fields.
-  bool use_mkldnn{false};
+  // NOTE: NOT use it, just for the internal test, will discard later
+  bool _use_mkldnn{false};
   // Specify the variable's name of each input.
   bool specify_input_name{false};
 

paddle/fluid/inference/tests/api/analyzer_vis_tester.cc

@@ -72,7 +72,7 @@ void TestVisualPrediction(bool use_mkldnn) {
   cfg.param_file = FLAGS_infer_model + "/__params__";
   cfg.prog_file = FLAGS_infer_model + "/__model__";
   cfg.use_gpu = false;
-  cfg.use_mkldnn = use_mkldnn;
+  cfg._use_mkldnn = use_mkldnn;
   cfg.device = 0;
   cfg.enable_ir_optim = true;
   cfg.ir_passes.push_back("fc_gru_fuse_pass");