bugfix for unique_ptr of IOptimizationProfile (#23917) (#26806)

This commit fixs the compiling bug regarding unique_ptr of IOptimizationProfile.

IOptimizationProfile has protected dtor and is controlled by TensorRT
internally. Application shouldn't delete the pointer of IOptimizationProfile.
See TensorRT document: https://docs.nvidia.com/deeplearning/sdk/tensorrt-api/c_api/classnvinfer1_1_1_i_builder.html#a9ac47e100454151d8206ac91d543299a
test=develop
Co-authored-by: NJeng Bai-Cheng <jeng1220@users.noreply.github.com>

paddle/fluid/inference/tensorrt/engine.cc

@@ -39,7 +39,7 @@ void TensorRTEngine::InitNetwork() {
             nvinfer1::NetworkDefinitionCreationFlag::kEXPLICIT_BATCH)));
     infer_builder_config_.reset(infer_builder_->createBuilderConfig());
     infer_ptr<nvinfer1::IBuilderConfig> infer_builder_config_;
-    optim_profile_.reset(infer_builder_->createOptimizationProfile());
+    optim_profile_ = infer_builder_->createOptimizationProfile();
 #endif
   } else {
     infer_network_.reset(infer_builder_->createNetwork());
@@ -185,7 +185,7 @@ void TensorRTEngine::FreezeNetwork() {
           input.first.c_str(), nvinfer1::OptProfileSelector::kOPT,
           Vec2TRT_Dims(optim_input_shape_[input.first], input.first, true));
     }
-    infer_builder_config_->addOptimizationProfile(optim_profile_.get());
+    infer_builder_config_->addOptimizationProfile(optim_profile_);
     if (WithFp16()) {
       infer_builder_config_->setFlag(nvinfer1::BuilderFlag::kFP16);
       if (disable_trt_plugin_fp16()) {

paddle/fluid/inference/tensorrt/engine.h

@@ -354,7 +354,7 @@ class TensorRTEngine {
   infer_ptr<nvinfer1::INetworkDefinition> infer_networkv2_;
 #if IS_TRT_VERSION_GE(6000)
   infer_ptr<nvinfer1::IBuilderConfig> infer_builder_config_;
-  std::unique_ptr<nvinfer1::IOptimizationProfile> optim_profile_;
+  nvinfer1::IOptimizationProfile* optim_profile_;
   std::vector<std::unique_ptr<plugin::DynamicPluginTensorRT>> owned_pluginv2_;
 #endif
   std::mutex mutex_;