add partial result

speechx/examples/ds2_ol/websocket/websocket_server.sh

@@ -45,7 +45,7 @@ export GLOG_logtostderr=1
 
 # 3. gen cmvn 
 cmvn=$data/cmvn.ark
-cmvn-json2kaldi --json_file=$ckpt_dir/data/mean_std.json --cmvn_write_path=$cmvn
+cmvn_json2kaldi_main --json_file=$ckpt_dir/data/mean_std.json --cmvn_write_path=$cmvn
 
 
 wfst=$data/wfst/

speechx/speechx/decoder/ctc_tlg_decoder.cc

@@ -47,6 +47,26 @@ void TLGDecoder::Reset() {
     return;
 }
 
+std::string TLGDecoder::GetPartialResult() {
+    if (frame_decoded_size_ == 0) {
+        // Assertion failed: (this->NumFramesDecoded() > 0 && "You cannot call
+        // BestPathEnd if no frames were decoded.")
+        return std::string("");
+    }
+    kaldi::Lattice lat;
+    kaldi::LatticeWeight weight;
+    std::vector<int> alignment;
+    std::vector<int> words_id;
+    decoder_->GetBestPath(&lat, false);
+    fst::GetLinearSymbolSequence(lat, &alignment, &words_id, &weight);
+    std::string words;
+    for (int32 idx = 0; idx < words_id.size(); ++idx) {
+        std::string word = word_symbol_table_->Find(words_id[idx]);
+        words += word;
+    }
+    return words; 
+}
+
 std::string TLGDecoder::GetFinalBestPath() {
     if (frame_decoded_size_ == 0) {
         // Assertion failed: (this->NumFramesDecoded() > 0 && "You cannot call

speechx/speechx/decoder/ctc_tlg_decoder.h

@@ -38,6 +38,7 @@ class TLGDecoder {
     std::string GetBestPath();
     std::vector<std::pair<double, std::string>> GetNBestPath();
     std::string GetFinalBestPath();
+    std::string GetPartialResult();
     int NumFrameDecoded();
     int DecodeLikelihoods(const std::vector<std::vector<BaseFloat>>& probs,
                           std::vector<std::string>& nbest_words);

speechx/speechx/decoder/recognizer.cc

@@ -44,6 +44,10 @@ std::string Recognizer::GetFinalResult() {
     return decoder_->GetFinalBestPath();
 }
 
+std::string Recognizer::GetPartialResult() {
+    return decoder_->GetPartialResult();
+}
+
 void Recognizer::SetFinished() {
     feature_pipeline_->SetFinished();
     input_finished_ = true;

speechx/speechx/decoder/recognizer.h

@@ -43,6 +43,7 @@ class Recognizer {
     void Accept(const kaldi::Vector<kaldi::BaseFloat>& waves);
     void Decode();
     std::string GetFinalResult();
+    std::string GetPartialResult();
     void SetFinished();
     bool IsFinished();
     void Reset();

speechx/speechx/websocket/websocket_client.cc

@@ -67,6 +67,9 @@ void WebSocketClient::ReadLoopFunc() {
             if (obj["type"] == "final_result") {
                 result_ = obj["result"].as_string().c_str();
             }
+            if (obj["type"] == "partial_result") {
+                partial_result_ = obj["partial_result"].as_string().c_str();
+            }
             if (obj["type"] == "speech_end") {
                 done_ = true;
                 break;

speechx/speechx/websocket/websocket_client.h

@@ -41,11 +41,13 @@ class WebSocketClient {
     void SendDataEnd();
     bool Done() const { return done_; }
     std::string GetResult() { return result_; }
+    std::string GetPartialResult() { return partial_result_; }
 
   private:
     void Connect();
     std::string host_;
     std::string result_;
+    std::string partial_result_;
     int port_;
     bool done_ = false;
     asio::io_context ioc_;

speechx/speechx/websocket/websocket_client_main.cc

@@ -59,7 +59,6 @@ int main(int argc, char* argv[]) {
             client.SendBinaryData(wav_chunk.data(),
                                   wav_chunk.size() * sizeof(int16));
 
-
             sample_offset += cur_chunk_size;
             LOG(INFO) << "Send " << cur_chunk_size << " samples";
             std::this_thread::sleep_for(

speechx/speechx/websocket/websocket_server.cc

@@ -75,9 +75,10 @@ void ConnectionHandler::OnSpeechData(const beast::flat_buffer& buffer) {
     CHECK(recognizer_ != nullptr);
     recognizer_->Accept(pcm_data);
 
-    // TODO: return lpartial result
+    std::string partial_result = recognizer_->GetPartialResult();
+    
     json::value rv = {
-        {"status", "ok"}, {"type", "partial_result"}, {"result", "TODO"}};
+        {"status", "ok"}, {"type", "partial_result"}, {"partial_result", partial_result}};
     ws_.text(true);
     ws_.write(asio::buffer(json::serialize(rv)));
 }

speechx/speechx/websocket/websocket_server.h

@@ -44,7 +44,6 @@ class ConnectionHandler {
     void OnFinish();
     void OnSpeechData(const beast::flat_buffer& buffer);
     void OnError(const std::string& message);
-    void OnPartialResult(const std::string& result);
     void OnFinalResult(const std::string& result);
     void DecodeThreadFunc();
     std::string SerializeResult(bool finish);