fsts-union.cc
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// fstbin/fsts-union.cc
// Copyright 2016 Johns Hopkins University (Authors: Jan "Yenda" Trmal)
// 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-utils.h"
#include "fstext/kaldi-fst-io.h"
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
using namespace fst;
typedef kaldi::int32 int32;
typedef kaldi::uint64 uint64;
const char *usage =
"Reads a kaldi archive of FSTs. Performs the FST operation union on\n"
"all fsts sharing the same key. Assumes the archive is sorted by key.\n"
"\n"
"Usage: fsts-union [options] <fsts-rspecifier> <fsts-wspecifier>\n"
" e.g.: fsts-union ark:keywords_tmp.fsts ark,t:keywords.fsts\n"
"\n"
"see also: fstunion (from the OpenFst toolkit)\n";
ParseOptions po(usage);
po.Read(argc, argv);
if (po.NumArgs() != 2) {
po.PrintUsage();
exit(1);
}
std::string fsts_rspecifier = po.GetArg(1),
fsts_wspecifier = po.GetArg(2);
SequentialTableReader<VectorFstHolder> fst_reader(fsts_rspecifier);
TableWriter<VectorFstHolder> fst_writer(fsts_wspecifier);
int32 n_out_done = 0,
n_in_done = 0;
std::string res_key = "";
VectorFst<StdArc> res_fst;
for (; !fst_reader.Done(); fst_reader.Next()) {
std::string key = fst_reader.Key();
VectorFst<StdArc> fst(fst_reader.Value());
n_in_done++;
if (key == res_key) {
fst::Union(&res_fst, fst);
} else {
if (res_key != "") {
VectorFst<StdArc> out_fst;
fst::Determinize(res_fst, &out_fst);
fst::Minimize(&out_fst);
fst::RmEpsilon(&out_fst);
fst_writer.Write(res_key, out_fst);
n_out_done++;
}
res_fst = fst;
res_key = key;
}
}
if (res_key != "") {
VectorFst<StdArc> out_fst;
fst::Determinize(res_fst, &out_fst);
fst::Minimize(&out_fst);
fst::RmEpsilon(&out_fst);
fst_writer.Write(res_key, out_fst);
n_out_done++;
}
KALDI_LOG << "Applied fst union on " << n_in_done
<< " FSTs, produced " << n_out_done << " FSTs";
return (n_out_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}