Yang Zhou
2 years ago
parent
642e0840b4
commit
2455d88997
@ -1,50 +1,66 @@
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// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "decoder/ctc_tlg_decoder.h"
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namespace ppspeech {
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TLGDecoder::TLGDecoder(TLGDecoderOptions opts) {
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fst_.reset(fst::Fst<fst::StdArc>::Read(opts.fst_path));
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CHECK(fst_ != nullptr);
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word_symbol_table_.reset(fst::SymbolTable::ReadText(opts.word_symbol_table));
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word_symbol_table_.reset(
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fst::SymbolTable::ReadText(opts.word_symbol_table));
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decoder_.reset(new kaldi::LatticeFasterOnlineDecoder(*fst_, opts.opts));
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decoder_->InitDecoding();
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frame_decoded_size_ = 0;
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}
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void TLGDecoder::InitDecoder() {
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decoder_->InitDecoding();
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frame_decoded_size_ = 0;
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}
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void TLGDecoder::AdvanceDecode(const std::shared_ptr<kaldi::DecodableInterface>& decodable) {
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while (1) {
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AdvanceDecoding(decodable.get());
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if (decodable->IsLastFrame(num_frame_decoded_)) break;
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void TLGDecoder::AdvanceDecode(
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const std::shared_ptr<kaldi::DecodableInterface>& decodable) {
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while (!decodable->IsLastFrame(frame_decoded_size_)) {
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LOG(INFO) << "num frame decode: " << frame_decoded_size_;
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AdvanceDecoding(decodable.get());
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}
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}
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void TLGDecoder::AdvanceDecoding(kaldi::DecodableInterface* decodable) {
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// skip blank frame?
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decoder_->AdvanceDecoding(decodable, 1);
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num_frame_decoded_++;
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decoder_->AdvanceDecoding(decodable, 1);
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frame_decoded_size_++;
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}
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void TLGDecoder::Reset() {
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decoder_->InitDecoding();
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return;
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InitDecoder();
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return;
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}
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std::string TLGDecoder::GetFinalBestPath() {
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decoder_->FinalizeDecoding();
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kaldi::Lattice lat;
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kaldi::LatticeWeight weight;
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std::vector<int> alignment;
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std::vector<int> words_id;
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decoder_->GetBestPath(&lat, true);
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fst::GetLinearSymbolSequence(lat, &alignment, &words_id, &weight);
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std::string words;
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for (int32 idx = 0; idx < words_id.size(); ++idx) {
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std::string word = word_symbol_table_->Find(words_id[idx]);
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words += word;
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}
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return words;
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decoder_->FinalizeDecoding();
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kaldi::Lattice lat;
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kaldi::LatticeWeight weight;
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std::vector<int> alignment;
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std::vector<int> words_id;
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decoder_->GetBestPath(&lat, true);
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fst::GetLinearSymbolSequence(lat, &alignment, &words_id, &weight);
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std::string words;
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for (int32 idx = 0; idx < words_id.size(); ++idx) {
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std::string word = word_symbol_table_->Find(words_id[idx]);
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words += word;
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}
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return words;
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}
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}
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