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src/latbin/lattice-difference.cc
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// latbin/lattice-difference.cc
// Copyright 2009-2011 Chao Weng
// 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;
using fst::SymbolTable;
using fst::VectorFst;
using fst::StdArc;
const char *usage =
"Compute FST difference on lattices (remove sequences in first lattice
"
" that appear in second lattice)
"
"Useful for the denominator lattice for MCE.
"
"Usage: lattice-difference [options] "
"lattice1-rspecifier lattice2-rspecifier lattice-wspecifier
"
" e.g.: lattice-difference ark:den.lats ark:num.lats ark:den_mce.lats
";
ParseOptions po(usage);
po.Read(argc, argv);
if (po.NumArgs() != 3) {
po.PrintUsage();
exit(1);
}
std::string lats1_rspecifier = po.GetArg(1);
std::string lats2_rspecifier = po.GetArg(2);
std::string lats_wspecifier = po.GetArg(3);
SequentialCompactLatticeReader compact_lattice_reader1(lats1_rspecifier);
RandomAccessCompactLatticeReader compact_lattice_reader2(lats2_rspecifier);
CompactLatticeWriter compact_lattice_writer(lats_wspecifier);
int32 n_done = 0, n_no_lat = 0, n_only_transcription = 0;
for (; !compact_lattice_reader1.Done(); compact_lattice_reader1.Next()) {
std::string key = compact_lattice_reader1.Key();
const CompactLattice &clat1 = compact_lattice_reader1.Value();
if (compact_lattice_reader2.HasKey(key)) {
CompactLattice clat2 (compact_lattice_reader2.Value(key));
// "Difference" requires clat2 to be unweighted, deterministic and epsilon-free.
// So we remove the weights, remove epsilons and determinize.
RemoveWeights(&clat2);
RmEpsilon(&clat2);
{ CompactLattice clat_tmp(clat2); Determinize(clat_tmp, &clat2); }
CompactLattice clat_out;
Difference(clat1, clat2, &clat_out);
if (clat_out.Start() == 0) {
compact_lattice_writer.Write(key, clat_out);
n_done++;
} else {
// In this case, the lattice only contains the transcription
KALDI_WARN << "Skipping utterance " << key
<< " because difference is empty.";
n_only_transcription++;
}
} else {
KALDI_WARN << "No lattice found for utterance " << key << " in "
<< lats2_rspecifier;
n_no_lat++;
}
}
KALDI_LOG << "Total " << n_done << " lattices written; "
<< n_only_transcription
<< " lattices had empty difference; "
<< n_no_lat << " missing lattices in second archive ";
return (n_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
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