use the default constructor of base class

test=develop

Author: Shixiaowei02

paddle/fluid/inference/anakin/engine.cc

@@ -46,10 +46,9 @@ AnakinEngine<TargetT, PrecisionType, RunType>::AnakinEngine(
       max_input_shape_(max_input_shape),
       program_inputs_(program_inputs),
       auto_config_layout_(auto_config_layout) {
-  std::call_once(init_anakin_, [this]() {
-    ::anakin::TargetWrapper<TargetT>::set_device(device_);
-    ::anakin::Env<TargetT>::env_init();
-  });
+  ::anakin::TargetWrapper<TargetT>::set_device(device_);
+  std::call_once(init_anakin_,
+                 [this]() { ::anakin::Env<TargetT>::env_init(); });
   graph_.reset(new AnakinGraphT<TargetT, PrecisionType>());
   net_.reset(new AnakinNetT<TargetT, PrecisionType, RunType>(need_summary));
 }

paddle/fluid/inference/api/api_anakin_engine.cc

@@ -34,8 +34,8 @@ extern std::once_flag PaddleInferenceAnakinPredictor<T, P, R>::init_anakin_;
 
 template <typename T, Precision P, OpRunType R>
 void PaddleInferenceAnakinPredictor<T, P, R>::InitEnv() {
+  anakin::TargetWrapper<T>::set_device(this->config_.device_id);
   std::call_once(this->init_anakin_, [this]() {
-    anakin::TargetWrapper<T>::set_device(this->config_.device_id);
     anakin::Env<T>::env_init(this->config_.max_stream);
   });
 }

paddle/fluid/inference/api/api_anakin_engine.h

@@ -37,7 +37,7 @@ using anakin::OpRunType;
 template <typename T, Precision P, OpRunType R>
 class PaddleInferenceAnakinPredictor : public PaddlePredictor {
  public:
-  PaddleInferenceAnakinPredictor() : config_() { this->InitEnv(); }
+  PaddleInferenceAnakinPredictor() = default;
 
   explicit PaddleInferenceAnakinPredictor(const AnakinConfig& config)
       : config_(config) {
@@ -79,7 +79,7 @@ class PaddleInferenceAnakinPredictor : public PaddlePredictor {
 
 #ifdef ANAKIN_MLU_PLACE
 template <Precision P, OpRunType R>
-class PaddleInferenceAnakinMLUPredictor
+class PaddleInferenceAnakinMLUPredictor final
     : public PaddleInferenceAnakinPredictor<anakin::MLU, P, R> {
  public:
   explicit PaddleInferenceAnakinMLUPredictor(const AnakinConfig& config) {