lattice-minimize.cc
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// latbin/lattice-minimize.cc
// Copyright 2013 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 "base/kaldi-common.h"
#include "util/common-utils.h"
#include "fstext/fstext-lib.h"
#include "lat/kaldi-lattice.h"
#include "lat/minimize-lattice.h"
#include "lat/push-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 fst::StdArc;
const char *usage =
"Minimize lattices, in CompactLattice format. Should be applied to\n"
"determinized lattices (e.g. produced with --determinize-lattice=true)\n"
"Note: by default this program\n"
"pushes the strings and weights prior to minimization."
"Usage: lattice-minimize [options] lattice-rspecifier lattice-wspecifier\n"
" e.g.: lattice-minimize ark:1.lats ark:2.lats\n";
ParseOptions po(usage);
bool push_strings = true;
bool push_weights = true;
po.Register("push-strings", &push_strings, "If true, push the strings in the "
"lattice to the start.");
po.Register("push-weights", &push_weights, "If true, push the weights in the "
"lattice to the start.");
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);
CompactLatticeWriter clat_writer(lats_wspecifier);
int32 n_done = 0, n_err = 0;
for (; !clat_reader.Done(); clat_reader.Next()) {
std::string key = clat_reader.Key();
CompactLattice clat = clat_reader.Value();
KALDI_VLOG(1) << "Processing lattice for utterance " << key;
if (push_strings && !PushCompactLatticeStrings(&clat)) {
KALDI_WARN << "Failure in pushing lattice strings (bad lattice?), "
<< "for key " << key;
n_err++;
continue;
}
if (push_weights && !PushCompactLatticeWeights(&clat)) {
KALDI_WARN << "Failure in pushing lattice weights (bad lattice?),"
<< "for key " << key ;
n_err++;
continue;
}
if (!MinimizeCompactLattice(&clat)) {
KALDI_WARN << "Failure in minimizing lattice (bad lattice?),"
<< "for key " << key ;
n_err++;
continue;
}
if (clat.NumStates() == 0) {
KALDI_WARN << "Empty lattice for key " << key;
n_err++;
continue;
}
clat_writer.Write(key, clat);
n_done++;
}
KALDI_LOG << "Minimized " << n_done << " lattices, errors on " << n_err;
return (n_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}