online-transducer-model.cc
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// sherpa-onnx/csrc/online-transducer-model.cc
//
// Copyright (c) 2023 Xiaomi Corporation
#include "sherpa-onnx/csrc/online-transducer-model.h"
#include <memory>
#include <sstream>
#include <string>
#include "sherpa-onnx/csrc/online-lstm-transducer-model.h"
#include "sherpa-onnx/csrc/online-zipformer-transducer-model.h"
#include "sherpa-onnx/csrc/onnx-utils.h"
namespace sherpa_onnx {
enum class ModelType {
kLstm,
kZipformer,
kUnkown,
};
static ModelType GetModelType(const OnlineTransducerModelConfig &config) {
Ort::Env env(ORT_LOGGING_LEVEL_WARNING);
Ort::SessionOptions sess_opts;
auto sess = std::make_unique<Ort::Session>(
env, SHERPA_MAYBE_WIDE(config.encoder_filename).c_str(), sess_opts);
Ort::ModelMetadata meta_data = sess->GetModelMetadata();
if (config.debug) {
std::ostringstream os;
PrintModelMetadata(os, meta_data);
fprintf(stderr, "%s\n", os.str().c_str());
}
Ort::AllocatorWithDefaultOptions allocator;
auto model_type =
meta_data.LookupCustomMetadataMapAllocated("model_type", allocator);
if (!model_type) {
fprintf(stderr, "No model_type in the metadata!\n");
return ModelType::kUnkown;
}
if (model_type.get() == std::string("lstm")) {
return ModelType::kLstm;
} else if (model_type.get() == std::string("zipformer")) {
return ModelType::kZipformer;
} else {
fprintf(stderr, "Unsupported model_type: %s\n", model_type.get());
return ModelType::kUnkown;
}
}
std::unique_ptr<OnlineTransducerModel> OnlineTransducerModel::Create(
const OnlineTransducerModelConfig &config) {
auto model_type = GetModelType(config);
switch (model_type) {
case ModelType::kLstm:
return std::make_unique<OnlineLstmTransducerModel>(config);
case ModelType::kZipformer:
return std::make_unique<OnlineZipformerTransducerModel>(config);
case ModelType::kUnkown:
return nullptr;
}
// unreachable code
return nullptr;
}
} // namespace sherpa_onnx