/**
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* Copyright FunASR (https://github.com/alibaba-damo-academy/FunASR). All Rights Reserved.
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* MIT License (https://opensource.org/licenses/MIT)
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*/
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#include "precomp.h"
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#include "paraformer-torch.h"
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#include "encode_converter.h"
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#include <cstddef>
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using namespace std;
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namespace funasr {
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ParaformerTorch::ParaformerTorch()
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:use_hotword(false){
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}
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// offline
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void ParaformerTorch::InitAsr(const std::string &am_model, const std::string &am_cmvn, const std::string &am_config, int thread_num){
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LoadConfigFromYaml(am_config.c_str());
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// knf options
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fbank_opts_.frame_opts.dither = 0;
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fbank_opts_.mel_opts.num_bins = n_mels;
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fbank_opts_.frame_opts.samp_freq = asr_sample_rate;
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fbank_opts_.frame_opts.window_type = window_type;
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fbank_opts_.frame_opts.frame_shift_ms = frame_shift;
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fbank_opts_.frame_opts.frame_length_ms = frame_length;
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fbank_opts_.energy_floor = 0;
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fbank_opts_.mel_opts.debug_mel = false;
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vocab = new Vocab(am_config.c_str());
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phone_set_ = new PhoneSet(am_config.c_str());
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LoadCmvn(am_cmvn.c_str());
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torch::DeviceType device = at::kCPU;
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#ifdef USE_GPU
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if (!torch::cuda::is_available()) {
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LOG(ERROR) << "CUDA is not available! Please check your GPU settings";
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exit(-1);
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} else {
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LOG(INFO) << "CUDA is available, running on GPU";
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device = at::kCUDA;
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}
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#endif
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#ifdef USE_IPEX
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torch::jit::setTensorExprFuserEnabled(false);
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#endif
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try {
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torch::jit::script::Module model = torch::jit::load(am_model, device);
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model_ = std::make_shared<TorchModule>(std::move(model));
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LOG(INFO) << "Successfully load model from " << am_model;
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} catch (std::exception const &e) {
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LOG(ERROR) << "Error when load am model: " << e.what();
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exit(-1);
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}
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}
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void ParaformerTorch::InitLm(const std::string &lm_file,
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const std::string &lm_cfg_file,
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const std::string &lex_file) {
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try {
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lm_ = std::shared_ptr<fst::Fst<fst::StdArc>>(
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fst::Fst<fst::StdArc>::Read(lm_file));
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if (lm_){
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lm_vocab = new Vocab(lm_cfg_file.c_str(), lex_file.c_str());
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LOG(INFO) << "Successfully load lm file " << lm_file;
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}else{
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LOG(ERROR) << "Failed to load lm file " << lm_file;
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}
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} catch (std::exception const &e) {
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LOG(ERROR) << "Error when load lm file: " << e.what();
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exit(0);
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}
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}
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void ParaformerTorch::LoadConfigFromYaml(const char* filename){
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YAML::Node config;
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try{
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config = YAML::LoadFile(filename);
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}catch(exception const &e){
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LOG(ERROR) << "Error loading file, yaml file error or not exist.";
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exit(-1);
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}
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try{
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YAML::Node frontend_conf = config["frontend_conf"];
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this->asr_sample_rate = frontend_conf["fs"].as<int>();
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YAML::Node lang_conf = config["lang"];
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if (lang_conf.IsDefined()){
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language = lang_conf.as<string>();
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}
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}catch(exception const &e){
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LOG(ERROR) << "Error when load argument from vad config YAML.";
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exit(-1);
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}
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}
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void ParaformerTorch::InitHwCompiler(const std::string &hw_model, int thread_num) {
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// TODO
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use_hotword = true;
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}
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void ParaformerTorch::InitSegDict(const std::string &seg_dict_model) {
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seg_dict = new SegDict(seg_dict_model.c_str());
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}
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ParaformerTorch::~ParaformerTorch()
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{
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if(vocab){
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delete vocab;
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}
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if(lm_vocab){
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delete lm_vocab;
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}
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if(seg_dict){
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delete seg_dict;
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}
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if(phone_set_){
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delete phone_set_;
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}
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}
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void ParaformerTorch::StartUtterance()
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{
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}
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void ParaformerTorch::EndUtterance()
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{
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}
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void ParaformerTorch::Reset()
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{
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}
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void ParaformerTorch::FbankKaldi(float sample_rate, const float* waves, int len, std::vector<std::vector<float>> &asr_feats) {
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knf::OnlineFbank fbank_(fbank_opts_);
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std::vector<float> buf(len);
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for (int32_t i = 0; i != len; ++i) {
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buf[i] = waves[i] * 32768;
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}
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fbank_.AcceptWaveform(sample_rate, buf.data(), buf.size());
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int32_t frames = fbank_.NumFramesReady();
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for (int32_t i = 0; i != frames; ++i) {
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const float *frame = fbank_.GetFrame(i);
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std::vector<float> frame_vector(frame, frame + fbank_opts_.mel_opts.num_bins);
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asr_feats.emplace_back(frame_vector);
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}
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}
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void ParaformerTorch::LoadCmvn(const char *filename)
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{
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ifstream cmvn_stream(filename);
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if (!cmvn_stream.is_open()) {
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LOG(ERROR) << "Failed to open file: " << filename;
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exit(-1);
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}
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string line;
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while (getline(cmvn_stream, line)) {
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istringstream iss(line);
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vector<string> line_item{istream_iterator<string>{iss}, istream_iterator<string>{}};
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if (line_item[0] == "<AddShift>") {
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getline(cmvn_stream, line);
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istringstream means_lines_stream(line);
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vector<string> means_lines{istream_iterator<string>{means_lines_stream}, istream_iterator<string>{}};
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if (means_lines[0] == "<LearnRateCoef>") {
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for (int j = 3; j < means_lines.size() - 1; j++) {
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means_list_.push_back(stof(means_lines[j]));
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}
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continue;
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}
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}
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else if (line_item[0] == "<Rescale>") {
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getline(cmvn_stream, line);
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istringstream vars_lines_stream(line);
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vector<string> vars_lines{istream_iterator<string>{vars_lines_stream}, istream_iterator<string>{}};
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if (vars_lines[0] == "<LearnRateCoef>") {
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for (int j = 3; j < vars_lines.size() - 1; j++) {
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vars_list_.push_back(stof(vars_lines[j])*scale);
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}
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continue;
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}
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}
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}
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}
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string ParaformerTorch::GreedySearch(float * in, int n_len, int64_t token_nums, bool is_stamp, std::vector<float> us_alphas, std::vector<float> us_cif_peak)
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{
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vector<int> hyps;
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int Tmax = n_len;
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for (int i = 0; i < Tmax; i++) {
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int max_idx;
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float max_val;
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FindMax(in + i * token_nums, token_nums, max_val, max_idx);
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hyps.push_back(max_idx);
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}
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if(!is_stamp){
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return vocab->Vector2StringV2(hyps, language);
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}else{
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std::vector<string> char_list;
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std::vector<std::vector<float>> timestamp_list;
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std::string res_str;
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vocab->Vector2String(hyps, char_list);
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std::vector<string> raw_char(char_list);
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TimestampOnnx(us_alphas, us_cif_peak, char_list, res_str, timestamp_list);
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return PostProcess(raw_char, timestamp_list);
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}
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}
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string ParaformerTorch::BeamSearch(WfstDecoder* &wfst_decoder, float *in, int len, int64_t token_nums)
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{
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return wfst_decoder->Search(in, len, token_nums);
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}
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string ParaformerTorch::FinalizeDecode(WfstDecoder* &wfst_decoder,
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bool is_stamp, std::vector<float> us_alphas, std::vector<float> us_cif_peak)
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{
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return wfst_decoder->FinalizeDecode(is_stamp, us_alphas, us_cif_peak);
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}
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void ParaformerTorch::LfrCmvn(std::vector<std::vector<float>> &asr_feats) {
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std::vector<std::vector<float>> out_feats;
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int T = asr_feats.size();
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int T_lrf = ceil(1.0 * T / lfr_n);
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// Pad frames at start(copy first frame)
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for (int i = 0; i < (lfr_m - 1) / 2; i++) {
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asr_feats.insert(asr_feats.begin(), asr_feats[0]);
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}
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// Merge lfr_m frames as one,lfr_n frames per window
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T = T + (lfr_m - 1) / 2;
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std::vector<float> p;
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for (int i = 0; i < T_lrf; i++) {
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if (lfr_m <= T - i * lfr_n) {
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for (int j = 0; j < lfr_m; j++) {
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p.insert(p.end(), asr_feats[i * lfr_n + j].begin(), asr_feats[i * lfr_n + j].end());
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}
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out_feats.emplace_back(p);
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p.clear();
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} else {
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// Fill to lfr_m frames at last window if less than lfr_m frames (copy last frame)
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int num_padding = lfr_m - (T - i * lfr_n);
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for (int j = 0; j < (asr_feats.size() - i * lfr_n); j++) {
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p.insert(p.end(), asr_feats[i * lfr_n + j].begin(), asr_feats[i * lfr_n + j].end());
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}
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for (int j = 0; j < num_padding; j++) {
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p.insert(p.end(), asr_feats[asr_feats.size() - 1].begin(), asr_feats[asr_feats.size() - 1].end());
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}
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out_feats.emplace_back(p);
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p.clear();
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}
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}
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// Apply cmvn
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for (auto &out_feat: out_feats) {
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for (int j = 0; j < means_list_.size(); j++) {
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out_feat[j] = (out_feat[j] + means_list_[j]) * vars_list_[j];
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}
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}
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asr_feats = out_feats;
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}
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string ParaformerTorch::Forward(float* din, int len, bool input_finished, const std::vector<std::vector<float>> &hw_emb, void* decoder_handle)
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{
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WfstDecoder* wfst_decoder = (WfstDecoder*)decoder_handle;
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int32_t in_feat_dim = fbank_opts_.mel_opts.num_bins;
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std::vector<std::vector<float>> asr_feats;
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FbankKaldi(asr_sample_rate, din, len, asr_feats);
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if(asr_feats.size() == 0){
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return "";
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}
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LfrCmvn(asr_feats);
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int32_t feat_dim = lfr_m*in_feat_dim;
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int32_t num_frames = asr_feats.size();
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std::vector<float> wav_feats;
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for (const auto &frame_feat: asr_feats) {
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wav_feats.insert(wav_feats.end(), frame_feat.begin(), frame_feat.end());
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}
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std::vector<int32_t> paraformer_length;
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paraformer_length.emplace_back(num_frames);
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torch::NoGradGuard no_grad;
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model_->eval();
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torch::Tensor feats =
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torch::from_blob(wav_feats.data(),
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{1, num_frames, feat_dim}, torch::kFloat).contiguous();
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torch::Tensor feat_lens = torch::from_blob(paraformer_length.data(),
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{1}, torch::kInt32);
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// 2. forward
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#ifdef USE_GPU
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feats = feats.to(at::kCUDA);
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feat_lens = feat_lens.to(at::kCUDA);
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#endif
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std::vector<torch::jit::IValue> inputs = {feats, feat_lens};
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string result="";
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try {
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auto outputs = model_->forward(inputs).toTuple()->elements();
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torch::Tensor am_scores;
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torch::Tensor valid_token_lens;
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#ifdef USE_GPU
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am_scores = outputs[0].toTensor().to(at::kCPU);
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valid_token_lens = outputs[1].toTensor().to(at::kCPU);
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#else
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am_scores = outputs[0].toTensor();
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valid_token_lens = outputs[1].toTensor();
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#endif
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// timestamp
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if(outputs.size() == 4){
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torch::Tensor us_alphas_tensor;
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torch::Tensor us_peaks_tensor;
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#ifdef USE_GPU
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us_alphas_tensor = outputs[2].toTensor().to(at::kCPU);
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us_peaks_tensor = outputs[3].toTensor().to(at::kCPU);
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#else
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us_alphas_tensor = outputs[2].toTensor();
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us_peaks_tensor = outputs[3].toTensor();
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#endif
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int us_alphas_shape_1 = us_alphas_tensor.size(1);
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float* us_alphas_data = us_alphas_tensor.data_ptr<float>();
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std::vector<float> us_alphas(us_alphas_shape_1);
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for (int i = 0; i < us_alphas_shape_1; i++) {
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us_alphas[i] = us_alphas_data[i];
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}
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int us_peaks_shape_1 = us_peaks_tensor.size(1);
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float* us_peaks_data = us_peaks_tensor.data_ptr<float>();
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std::vector<float> us_peaks(us_peaks_shape_1);
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for (int i = 0; i < us_peaks_shape_1; i++) {
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us_peaks[i] = us_peaks_data[i];
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}
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if (lm_ == nullptr) {
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result = GreedySearch(am_scores[0].data_ptr<float>(), valid_token_lens[0].item<int>(), am_scores.size(2), true, us_alphas, us_peaks);
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} else {
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result = BeamSearch(wfst_decoder, am_scores[0].data_ptr<float>(), valid_token_lens[0].item<int>(), am_scores.size(2));
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if (input_finished) {
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result = FinalizeDecode(wfst_decoder, true, us_alphas, us_peaks);
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}
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}
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}else{
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if (lm_ == nullptr) {
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result = GreedySearch(am_scores[0].data_ptr<float>(), valid_token_lens[0].item<int>(), am_scores.size(2));
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} else {
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result = BeamSearch(wfst_decoder, am_scores[0].data_ptr<float>(), valid_token_lens[0].item<int>(), am_scores.size(2));
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if (input_finished) {
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result = FinalizeDecode(wfst_decoder);
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}
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}
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}
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}
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catch (std::exception const &e)
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{
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LOG(ERROR)<<e.what();
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}
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return result;
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}
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std::vector<std::vector<float>> ParaformerTorch::CompileHotwordEmbedding(std::string &hotwords) {
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// TODO
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std::vector<std::vector<float>> result(1, std::vector<float>(10, 0.0f));
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return result;
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}
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Vocab* ParaformerTorch::GetVocab()
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{
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return vocab;
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}
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Vocab* ParaformerTorch::GetLmVocab()
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{
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return lm_vocab;
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}
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PhoneSet* ParaformerTorch::GetPhoneSet()
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{
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return phone_set_;
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}
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string ParaformerTorch::Rescoring()
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{
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LOG(ERROR)<<"Not Imp!!!!!!";
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return "";
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}
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} // namespace funasr
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