lattice-1best.cc
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// latbin/lattice-1best.cc
// Copyright 2009-2012 Stefan Kombrink Johns Hopkins University (Author: Daniel Povey)
// 2018 Music Technology Group, Universitat Pompeu Fabra (Rong Gong)
// 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 "base/kaldi-common.h"
#include "util/common-utils.h"
#include "fstext/fstext-lib.h"
#include "lat/kaldi-lattice.h"
#include "lat/lattice-functions.h"
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
typedef kaldi::int32 int32;
typedef kaldi::int64 int64;
using fst::VectorFst;
using fst::StdArc;
const char *usage =
"Compute best path through lattices and write out as FSTs\n"
"Note: differs from lattice-nbest with --n=1 because we won't\n"
"append -1 to the utterance-ids. Differs from lattice-best-path\n"
"because output is FST.\n"
"\n"
"Usage: lattice-1best [options] <lattice-rspecifier> <lattice-wspecifier>\n"
" e.g.: lattice-1best --acoustic-scale=0.1 ark:1.lats ark:1best.lats\n";
ParseOptions po(usage);
BaseFloat acoustic_scale = 1.0;
BaseFloat lm_scale = 1.0;
BaseFloat word_ins_penalty = 0.0;
po.Register("acoustic-scale", &acoustic_scale,
"Scaling factor for acoustic likelihoods");
po.Register("lm-scale", &lm_scale,
"Scaling factor for language model scores.");
po.Register("word-ins-penalty", &word_ins_penalty,
"Word insertion penality.");
po.Read(argc, argv);
if (po.NumArgs() != 2) {
po.PrintUsage();
exit(1);
}
std::string lats_rspecifier = po.GetArg(1),
lats_wspecifier = po.GetArg(2);
SequentialCompactLatticeReader clat_reader(lats_rspecifier);
// Write as compact lattice.
CompactLatticeWriter compact_1best_writer(lats_wspecifier);
int32 n_done = 0, n_err = 0;
if (acoustic_scale == 0.0 || lm_scale == 0.0)
KALDI_ERR << "Do not use exactly zero acoustic or LM scale (cannot be inverted)";
for (; !clat_reader.Done(); clat_reader.Next()) {
std::string key = clat_reader.Key();
CompactLattice clat = clat_reader.Value();
clat_reader.FreeCurrent();
fst::ScaleLattice(fst::LatticeScale(lm_scale, acoustic_scale), &clat);
if (word_ins_penalty > 0.0) {
AddWordInsPenToCompactLattice(word_ins_penalty, &clat);
}
CompactLattice best_path;
CompactLatticeShortestPath(clat, &best_path);
if (best_path.Start() == fst::kNoStateId) {
KALDI_WARN << "Possibly empty lattice for utterance-id " << key
<< "(no output)";
n_err++;
} else {
if (word_ins_penalty > 0.0) {
AddWordInsPenToCompactLattice(-word_ins_penalty, &best_path);
}
fst::ScaleLattice(fst::LatticeScale(1.0 / lm_scale, 1.0/acoustic_scale),
&best_path);
compact_1best_writer.Write(key, best_path);
n_done++;
}
}
KALDI_LOG << "Done converting " << n_done << " to best path, "
<< n_err << " had errors.";
return (n_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}