offline-rnn-lm.cc
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// sherpa-onnx/csrc/offline-rnn-lm.cc
//
// Copyright (c) 2023 Xiaomi Corporation
#include "sherpa-onnx/csrc/offline-rnn-lm.h"
#include <string>
#include <utility>
#include <vector>
#include "onnxruntime_cxx_api.h" // NOLINT
#include "sherpa-onnx/csrc/macros.h"
#include "sherpa-onnx/csrc/onnx-utils.h"
#include "sherpa-onnx/csrc/text-utils.h"
#include "sherpa-onnx/csrc/session.h"
namespace sherpa_onnx {
class OfflineRnnLM::Impl {
public:
explicit Impl(const OfflineLMConfig &config)
: config_(config),
env_(ORT_LOGGING_LEVEL_ERROR),
sess_opts_{GetSessionOptions(config)},
allocator_{} {
Init(config);
}
Ort::Value Rescore(Ort::Value x, Ort::Value x_lens) {
std::array<Ort::Value, 2> inputs = {std::move(x), std::move(x_lens)};
auto out =
sess_->Run({}, input_names_ptr_.data(), inputs.data(), inputs.size(),
output_names_ptr_.data(), output_names_ptr_.size());
return std::move(out[0]);
}
private:
void Init(const OfflineLMConfig &config) {
auto buf = ReadFile(config_.model);
sess_ = std::make_unique<Ort::Session>(env_, buf.data(), buf.size(),
sess_opts_);
GetInputNames(sess_.get(), &input_names_, &input_names_ptr_);
GetOutputNames(sess_.get(), &output_names_, &output_names_ptr_);
}
private:
OfflineLMConfig config_;
Ort::Env env_;
Ort::SessionOptions sess_opts_;
Ort::AllocatorWithDefaultOptions allocator_;
std::unique_ptr<Ort::Session> sess_;
std::vector<std::string> input_names_;
std::vector<const char *> input_names_ptr_;
std::vector<std::string> output_names_;
std::vector<const char *> output_names_ptr_;
};
OfflineRnnLM::OfflineRnnLM(const OfflineLMConfig &config)
: impl_(std::make_unique<Impl>(config)) {}
OfflineRnnLM::~OfflineRnnLM() = default;
Ort::Value OfflineRnnLM::Rescore(Ort::Value x, Ort::Value x_lens) {
return impl_->Rescore(std::move(x), std::move(x_lens));
}
} // namespace sherpa_onnx