encoder only trt ep for transducer (#1130)

@@ -33,7 +33,9 @@ namespace sherpa_onnx {
 OnlineZipformer2TransducerModel::OnlineZipformer2TransducerModel(
     const OnlineModelConfig &config)
     : env_(ORT_LOGGING_LEVEL_WARNING),
-      sess_opts_(GetSessionOptions(config)),
+      encoder_sess_opts_(GetSessionOptions(config)),
+      decoder_sess_opts_(GetSessionOptions(config, "decoder")),
+      joiner_sess_opts_(GetSessionOptions(config, "joiner")),
       config_(config),
       allocator_{} {
   {
@@ -57,7 +59,9 @@ OnlineZipformer2TransducerModel::OnlineZipformer2TransducerModel(
     AAssetManager *mgr, const OnlineModelConfig &config)
     : env_(ORT_LOGGING_LEVEL_WARNING),
       config_(config),
-      sess_opts_(GetSessionOptions(config)),
+      encoder_sess_opts_(GetSessionOptions(config)),
+      decoder_sess_opts_(GetSessionOptions(config)),
+      joiner_sess_opts_(GetSessionOptions(config)),
       allocator_{} {
   {
     auto buf = ReadFile(mgr, config.transducer.encoder);
@@ -79,7 +83,7 @@ OnlineZipformer2TransducerModel::OnlineZipformer2TransducerModel(
 void OnlineZipformer2TransducerModel::InitEncoder(void *model_data,
                                                   size_t model_data_length) {
   encoder_sess_ = std::make_unique<Ort::Session>(env_, model_data,
-                                                 model_data_length, sess_opts_);
+                      model_data_length, encoder_sess_opts_);
 
   GetInputNames(encoder_sess_.get(), &encoder_input_names_,
                 &encoder_input_names_ptr_);
@@ -132,7 +136,7 @@ void OnlineZipformer2TransducerModel::InitEncoder(void *model_data,
 void OnlineZipformer2TransducerModel::InitDecoder(void *model_data,
                                                   size_t model_data_length) {
   decoder_sess_ = std::make_unique<Ort::Session>(env_, model_data,
-                                                 model_data_length, sess_opts_);
+                      model_data_length, decoder_sess_opts_);
 
   GetInputNames(decoder_sess_.get(), &decoder_input_names_,
                 &decoder_input_names_ptr_);
@@ -157,7 +161,7 @@ void OnlineZipformer2TransducerModel::InitDecoder(void *model_data,
 void OnlineZipformer2TransducerModel::InitJoiner(void *model_data,
                                                  size_t model_data_length) {
   joiner_sess_ = std::make_unique<Ort::Session>(env_, model_data,
-                                                model_data_length, sess_opts_);
+                      model_data_length, joiner_sess_opts_);
 
   GetInputNames(joiner_sess_.get(), &joiner_input_names_,
                 &joiner_input_names_ptr_);

@@ -65,7 +65,10 @@ class OnlineZipformer2TransducerModel : public OnlineTransducerModel {
 
  private:
   Ort::Env env_;
-  Ort::SessionOptions sess_opts_;
+  Ort::SessionOptions encoder_sess_opts_;
+  Ort::SessionOptions decoder_sess_opts_;
+  Ort::SessionOptions joiner_sess_opts_;
+
   Ort::AllocatorWithDefaultOptions allocator_;
 
   std::unique_ptr<Ort::Session> encoder_sess_;

@@ -94,7 +94,6 @@ static Ort::SessionOptions GetSessionOptionsImpl(int32_t num_threads,
           std::to_string(trt_config.trt_timing_cache_enable);
       auto trt_dump_subgraphs =
           std::to_string(trt_config.trt_dump_subgraphs);
-
       std::vector<TrtPairs> trt_options = {
         {"device_id", device_id.c_str()},
         {"trt_max_workspace_size", trt_max_workspace_size.c_str()},
@@ -223,6 +222,21 @@ Ort::SessionOptions GetSessionOptions(const OnlineModelConfig &config) {
         config.provider_config.provider, &config.provider_config);
 }
 
+Ort::SessionOptions GetSessionOptions(const OnlineModelConfig &config,
+      const std::string &model_type) {
+  /*
+    Transducer models : Only encoder will run with tensorrt,
+                        decoder and joiner will run with cuda
+  */
+  if(config.provider_config.provider == "trt" &&
+      (model_type == "decoder" || model_type == "joiner")) {
+    return GetSessionOptionsImpl(config.num_threads,
+        "cuda", &config.provider_config);
+  }
+  return GetSessionOptionsImpl(config.num_threads,
+        config.provider_config.provider, &config.provider_config);
+}
+
 Ort::SessionOptions GetSessionOptions(const OfflineModelConfig &config) {
   return GetSessionOptionsImpl(config.num_threads, config.provider);
 }

@@ -24,6 +24,9 @@ namespace sherpa_onnx {
 
 Ort::SessionOptions GetSessionOptions(const OnlineModelConfig &config);
 
+Ort::SessionOptions GetSessionOptions(const OnlineModelConfig &config,
+      const std::string &model_type);
+
 Ort::SessionOptions GetSessionOptions(const OfflineModelConfig &config);
 
 Ort::SessionOptions GetSessionOptions(const OfflineLMConfig &config);