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src/online2/online-nnet2-decoding.cc
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// online2/online-nnet2-decoding.cc
// Copyright 2013-2014 Johns Hopkins University (author: Daniel Povey)
// See ../../COPYING for clarification regarding multiple authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.
#include "online2/online-nnet2-decoding.h"
#include "lat/lattice-functions.h"
#include "lat/determinize-lattice-pruned.h"
namespace kaldi {
SingleUtteranceNnet2Decoder::SingleUtteranceNnet2Decoder(
const OnlineNnet2DecodingConfig &config,
const TransitionModel &tmodel,
const nnet2::AmNnet &model,
const fst::Fst<fst::StdArc> &fst,
OnlineFeatureInterface *feature_pipeline):
config_(config),
feature_pipeline_(feature_pipeline),
tmodel_(tmodel),
decodable_(model, tmodel, config.decodable_opts, feature_pipeline),
decoder_(fst, config.decoder_opts) {
decoder_.InitDecoding();
}
void SingleUtteranceNnet2Decoder::AdvanceDecoding() {
decoder_.AdvanceDecoding(&decodable_);
}
void SingleUtteranceNnet2Decoder::FinalizeDecoding() {
decoder_.FinalizeDecoding();
}
int32 SingleUtteranceNnet2Decoder::NumFramesDecoded() const {
return decoder_.NumFramesDecoded();
}
void SingleUtteranceNnet2Decoder::GetLattice(bool end_of_utterance,
CompactLattice *clat) const {
if (NumFramesDecoded() == 0)
KALDI_ERR << "You cannot get a lattice if you decoded no frames.";
Lattice raw_lat;
decoder_.GetRawLattice(&raw_lat, end_of_utterance);
if (!config_.decoder_opts.determinize_lattice)
KALDI_ERR << "--determinize-lattice=false option is not supported at the moment";
BaseFloat lat_beam = config_.decoder_opts.lattice_beam;
DeterminizeLatticePhonePrunedWrapper(
tmodel_, &raw_lat, lat_beam, clat, config_.decoder_opts.det_opts);
}
void SingleUtteranceNnet2Decoder::GetBestPath(bool end_of_utterance,
Lattice *best_path) const {
decoder_.GetBestPath(best_path, end_of_utterance);
}
bool SingleUtteranceNnet2Decoder::EndpointDetected(
const OnlineEndpointConfig &config) {
return kaldi::EndpointDetected(config, tmodel_,
feature_pipeline_->FrameShiftInSeconds(),
decoder_);
}
} // namespace kaldi
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