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src/fstbin/fstrmepslocal.cc
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// fstbin/fstrmepslocal.cc
// Copyright 2009-2011 Microsoft Corporation
// 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/kaldi-io.h"
#include "util/parse-options.h"
#include "util/text-utils.h"
#include "fst/fstlib.h"
#include "fstext/determinize-star.h"
#include "fstext/fstext-utils.h"
#include "fstext/kaldi-fst-io.h"
/*
A test example:
( echo "0 1 1 0"; echo "1 2 0 2"; echo "2 0"; ) | fstcompile | fstrmepslocal | fstprint
# prints:
# 0 1 1 2
# 1
( echo "0 1 0 0"; echo "0 0"; echo "1 0" ) | fstcompile | fstrmepslocal | fstprint
# 0
( echo "0 1 0 0"; echo "0 0"; echo "1 0" ) | fstcompile | fstrmepslocal | fstprint
( echo "0 1 0 0"; echo "0 0"; echo "1 0" ) | fstcompile | fstrmepslocal --use-log=true | fstprint
# 0 -0.693147182
*/
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
using namespace fst;
using kaldi::int32;
const char *usage =
"Removes some (but not all) epsilons in an algorithm that will always reduce the number of
"
"arcs+states. Option to preserves equivalence in tropical or log semiring, and
"
"if in tropical, stochasticit in either log or tropical.
"
"
"
"Usage: fstrmepslocal [in.fst [out.fst] ]
";
ParseOptions po(usage);
bool use_log = false;
bool stochastic_in_log = true;
po.Register("use-log", &use_log,
"Preserve equivalence in log semiring [false->tropical]
");
po.Register("stochastic-in-log", &stochastic_in_log,
"Preserve stochasticity in log semiring [false->tropical]
");
po.Read(argc, argv);
if (po.NumArgs() > 2) {
po.PrintUsage();
exit(1);
}
std::string fst_in_filename = po.GetOptArg(1),
fst_out_filename = po.GetOptArg(2);
VectorFst<StdArc> *fst = ReadFstKaldi(fst_in_filename);
if (!use_log && stochastic_in_log) {
RemoveEpsLocalSpecial(fst);
} else if (use_log && !stochastic_in_log) {
std::cerr << "fstrmsymbols: invalid combination of flags
";
return 1;
} else if (use_log) {
VectorFst<LogArc> log_fst;
Cast(*fst, &log_fst);
delete fst;
RemoveEpsLocal(&log_fst);
fst = new VectorFst<StdArc>;
Cast(log_fst, fst);
} else {
RemoveEpsLocal(fst);
}
WriteFstKaldi(*fst, fst_out_filename);
delete fst;
return 0;
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
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