offline-ctc-model.cc
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// sherpa-onnx/csrc/offline-ctc-model.cc
//
// Copyright (c) 2022-2023 Xiaomi Corporation
#include "sherpa-onnx/csrc/offline-ctc-model.h"
#include <algorithm>
#include <memory>
#include <sstream>
#include <string>
#include "sherpa-onnx/csrc/macros.h"
#include "sherpa-onnx/csrc/offline-nemo-enc-dec-ctc-model.h"
#include "sherpa-onnx/csrc/offline-tdnn-ctc-model.h"
#include "sherpa-onnx/csrc/offline-zipformer-ctc-model.h"
#include "sherpa-onnx/csrc/onnx-utils.h"
namespace {
enum class ModelType {
kEncDecCTCModelBPE,
kTdnn,
kZipformerCtc,
kUnkown,
};
}
namespace sherpa_onnx {
static ModelType GetModelType(char *model_data, size_t model_data_length,
bool debug) {
Ort::Env env(ORT_LOGGING_LEVEL_WARNING);
Ort::SessionOptions sess_opts;
auto sess = std::make_unique<Ort::Session>(env, model_data, model_data_length,
sess_opts);
Ort::ModelMetadata meta_data = sess->GetModelMetadata();
if (debug) {
std::ostringstream os;
PrintModelMetadata(os, meta_data);
SHERPA_ONNX_LOGE("%s", os.str().c_str());
}
Ort::AllocatorWithDefaultOptions allocator;
auto model_type =
meta_data.LookupCustomMetadataMapAllocated("model_type", allocator);
if (!model_type) {
SHERPA_ONNX_LOGE(
"No model_type in the metadata!\n"
"If you are using models from NeMo, please refer to\n"
"https://huggingface.co/csukuangfj/"
"sherpa-onnx-nemo-ctc-en-citrinet-512/blob/main/add-model-metadata.py"
"\n"
"for how to add metadta to model.onnx\n");
return ModelType::kUnkown;
}
if (model_type.get() == std::string("EncDecCTCModelBPE")) {
return ModelType::kEncDecCTCModelBPE;
} else if (model_type.get() == std::string("tdnn")) {
return ModelType::kTdnn;
} else if (model_type.get() == std::string("zipformer2_ctc")) {
return ModelType::kZipformerCtc;
} else {
SHERPA_ONNX_LOGE("Unsupported model_type: %s", model_type.get());
return ModelType::kUnkown;
}
}
std::unique_ptr<OfflineCtcModel> OfflineCtcModel::Create(
const OfflineModelConfig &config) {
ModelType model_type = ModelType::kUnkown;
std::string filename;
if (!config.nemo_ctc.model.empty()) {
filename = config.nemo_ctc.model;
} else if (!config.tdnn.model.empty()) {
filename = config.tdnn.model;
} else if (!config.zipformer_ctc.model.empty()) {
filename = config.zipformer_ctc.model;
} else {
SHERPA_ONNX_LOGE("Please specify a CTC model");
exit(-1);
}
{
auto buffer = ReadFile(filename);
model_type = GetModelType(buffer.data(), buffer.size(), config.debug);
}
switch (model_type) {
case ModelType::kEncDecCTCModelBPE:
return std::make_unique<OfflineNemoEncDecCtcModel>(config);
break;
case ModelType::kTdnn:
return std::make_unique<OfflineTdnnCtcModel>(config);
break;
case ModelType::kZipformerCtc:
return std::make_unique<OfflineZipformerCtcModel>(config);
break;
case ModelType::kUnkown:
SHERPA_ONNX_LOGE("Unknown model type in offline CTC!");
return nullptr;
}
return nullptr;
}
#if __ANDROID_API__ >= 9
std::unique_ptr<OfflineCtcModel> OfflineCtcModel::Create(
AAssetManager *mgr, const OfflineModelConfig &config) {
ModelType model_type = ModelType::kUnkown;
std::string filename;
if (!config.nemo_ctc.model.empty()) {
filename = config.nemo_ctc.model;
} else if (!config.tdnn.model.empty()) {
filename = config.tdnn.model;
} else if (!config.zipformer_ctc.model.empty()) {
filename = config.zipformer_ctc.model;
} else {
SHERPA_ONNX_LOGE("Please specify a CTC model");
exit(-1);
}
{
auto buffer = ReadFile(mgr, filename);
model_type = GetModelType(buffer.data(), buffer.size(), config.debug);
}
switch (model_type) {
case ModelType::kEncDecCTCModelBPE:
return std::make_unique<OfflineNemoEncDecCtcModel>(mgr, config);
break;
case ModelType::kTdnn:
return std::make_unique<OfflineTdnnCtcModel>(mgr, config);
break;
case ModelType::kZipformerCtc:
return std::make_unique<OfflineZipformerCtcModel>(mgr, config);
break;
case ModelType::kUnkown:
SHERPA_ONNX_LOGE("Unknown model type in offline CTC!");
return nullptr;
}
return nullptr;
}
#endif
} // namespace sherpa_onnx