lattice-expand-ngram.cc
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// latbin/lattice-expand-ngram.cc
// Copyright 2014 Telepoint Global Hosting Service, LLC. (Author: David Snyder)
// 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"
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
typedef kaldi::int32 int32;
typedef kaldi::int64 int64;
using fst::SymbolTable;
using fst::VectorFst;
using kaldi::CompactLatticeArc;
const char *usage =
"Expand lattices so that each arc has a unique n-label history, for\n"
"a specified n (defaults to 3).\n"
"Usage: lattice-expand-ngram [options] lattice-rspecifier "
"lattice-wspecifier\n"
"e.g.: lattice-expand-ngram --n=3 ark:lat ark:expanded_lat\n";
ParseOptions po(usage);
int32 n = 3;
std::string word_syms_filename;
po.Register("n", &n, "n-gram context to expand to.");
po.Read(argc, argv);
if (po.NumArgs() != 2) {
po.PrintUsage();
exit(1);
}
KALDI_ASSERT(n > 0);
std::string lats_rspecifier = po.GetArg(1),
lats_wspecifier = po.GetOptArg(2);
fst::UnweightedNgramFst<CompactLatticeArc> expand_fst(n);
SequentialCompactLatticeReader lat_reader(lats_rspecifier);
CompactLatticeWriter lat_writer(lats_wspecifier);
int32 n_done = 0, n_fail = 0;
for (; !lat_reader.Done(); lat_reader.Next()) {
std::string key = lat_reader.Key();
KALDI_LOG << "Processing lattice for key " << key;
CompactLattice lat = lat_reader.Value();
CompactLattice expanded_lat;
ComposeDeterministicOnDemand(lat, &expand_fst, &expanded_lat);
if (expanded_lat.Start() == fst::kNoStateId) {
KALDI_WARN << "Empty lattice for utterance " << key;
n_fail++;
} else {
if (lat.NumStates() == expanded_lat.NumStates()) {
KALDI_LOG << "Lattice for key " << key
<< " did not need to be expanded for order " << n << ".";
} else {
KALDI_LOG << "Lattice expanded from " << lat.NumStates() << " to "
<< expanded_lat.NumStates() << " states for order " << n << ".";
}
lat_writer.Write(key, expanded_lat);
n_done++;
}
lat_reader.FreeCurrent();
}
KALDI_LOG << "Processed " << n_done << " lattices with " << n_fail
<< " failures.";
return 0;
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}