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129 lines
4.0 KiB
129 lines
4.0 KiB
// 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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#pragma once
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#include "base/common.h"
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#include "decoder/decoder_itf.h"
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#include "kaldi/decoder/lattice-faster-online-decoder.h"
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#include "util/parse-options.h"
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DECLARE_string(word_symbol_table);
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DECLARE_string(graph_path);
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DECLARE_int32(max_active);
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DECLARE_double(beam);
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DECLARE_double(lattice_beam);
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DECLARE_int32(nbest);
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namespace ppspeech {
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struct TLGDecoderOptions {
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kaldi::LatticeFasterDecoderConfig opts{};
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// todo remove later, add into decode resource
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std::string word_symbol_table;
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std::string fst_path;
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int nbest;
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TLGDecoderOptions() : word_symbol_table(""), fst_path(""), nbest(10) {}
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static TLGDecoderOptions InitFromFlags() {
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TLGDecoderOptions decoder_opts;
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decoder_opts.word_symbol_table = FLAGS_word_symbol_table;
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decoder_opts.fst_path = FLAGS_graph_path;
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LOG(INFO) << "fst path: " << decoder_opts.fst_path;
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LOG(INFO) << "fst symbole table: " << decoder_opts.word_symbol_table;
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decoder_opts.opts.max_active = FLAGS_max_active;
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decoder_opts.opts.beam = FLAGS_beam;
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decoder_opts.opts.lattice_beam = FLAGS_lattice_beam;
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decoder_opts.nbest = FLAGS_nbest;
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LOG(INFO) << "LatticeFasterDecoder max active: "
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<< decoder_opts.opts.max_active;
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LOG(INFO) << "LatticeFasterDecoder beam: " << decoder_opts.opts.beam;
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LOG(INFO) << "LatticeFasterDecoder lattice_beam: "
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<< decoder_opts.opts.lattice_beam;
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return decoder_opts;
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}
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};
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class TLGDecoder : public DecoderBase {
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public:
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explicit TLGDecoder(TLGDecoderOptions opts);
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~TLGDecoder() = default;
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void InitDecoder() override;
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void Reset() override;
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void AdvanceDecode(
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const std::shared_ptr<kaldi::DecodableInterface>& decodable) override;
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void Decode();
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std::string GetFinalBestPath() override;
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std::string GetPartialResult() override;
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const std::shared_ptr<fst::SymbolTable> WordSymbolTable() const override {
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return word_symbol_table_;
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}
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int DecodeLikelihoods(const std::vector<std::vector<BaseFloat>>& probs,
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const std::vector<std::string>& nbest_words);
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void FinalizeSearch() override;
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const std::vector<std::vector<int>>& Inputs() const override {
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return hypotheses_;
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}
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const std::vector<std::vector<int>>& Outputs() const override {
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return olabels_;
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} // outputs_; }
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const std::vector<float>& Likelihood() const override {
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return likelihood_;
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}
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const std::vector<std::vector<int>>& Times() const override {
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return times_;
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}
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protected:
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std::string GetBestPath() override {
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CHECK(false);
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return {};
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}
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std::vector<std::pair<double, std::string>> GetNBestPath() override {
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CHECK(false);
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return {};
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}
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std::vector<std::pair<double, std::string>> GetNBestPath(int n) override {
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CHECK(false);
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return {};
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}
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private:
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void AdvanceDecoding(kaldi::DecodableInterface* decodable);
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int num_frame_decoded_;
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std::vector<std::vector<int>> hypotheses_;
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std::vector<std::vector<int>> olabels_;
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std::vector<float> likelihood_;
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std::vector<std::vector<int>> times_;
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std::shared_ptr<kaldi::LatticeFasterOnlineDecoder> decoder_;
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std::shared_ptr<fst::Fst<fst::StdArc>> fst_;
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std::shared_ptr<fst::SymbolTable> word_symbol_table_;
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TLGDecoderOptions opts_;
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};
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} // namespace ppspeech
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