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// bin/add-self-loops.cc
// Copyright 2009-2011 Microsoft Corporation
// 2015 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 "hmm/transition-model.h"
#include "hmm/hmm-utils.h"
#include "tree/context-dep.h"
#include "util/common-utils.h"
#include "fst/fstlib.h"
#include "fstext/table-matcher.h"
#include "fstext/fstext-utils.h"
#include "fstext/context-fst.h"
/** @brief Add self-loops and transition probabilities to transducer, expanding to transition-ids.
*/
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 =
"Add self-loops and transition probabilities to transducer. Input transducer
"
"has transition-ids on the input side, but only the forward transitions, not the
"
"self-loops. Output transducer has transition-ids on the input side, but with
"
"self-loops added. The --reorder option controls whether the loop is added before
"
"the forward transition (if false), or afterward (if true). The default (true)
"
"is recommended as the decoding will in that case be faster.
"
"Usage: add-self-loops [options] transition-gmm/acoustic-model [fst-in] [fst-out]
"
"e.g.:
"
" add-self-loops --self-loop-scale=0.1 1.mdl HCLGa.fst HCLG.fst
"
"or: add-self-loops --self-loop-scale=0.1 1.mdl <HCLGa.fst >HCLG.fst
";
BaseFloat self_loop_scale = 1.0;
bool reorder = true;
std::string disambig_in_filename;
ParseOptions po(usage);
po.Register("self-loop-scale", &self_loop_scale,
"Scale for self-loop probabilities relative to LM.");
po.Register("disambig-syms", &disambig_in_filename,
"List of disambiguation symbols on input of fst-in [input file]");
po.Register("reorder", &reorder,
"If true, reorder symbols for more decoding efficiency");
po.Read(argc, argv);
if (po.NumArgs() < 1 || po.NumArgs() > 3) {
po.PrintUsage();
exit(1);
}
std::string model_in_filename = po.GetArg(1);
std::string fst_in_filename = po.GetOptArg(2);
if (fst_in_filename == "-") fst_in_filename = "";
std::string fst_out_filename = po.GetOptArg(3);
if (fst_out_filename == "-") fst_out_filename = "";
#if _MSC_VER
if (fst_in_filename == "")
_setmode(_fileno(stdin), _O_BINARY);
if (fst_out_filename == "")
_setmode(_fileno(stdout), _O_BINARY);
#endif
std::vector<int32> disambig_syms_in;
if (disambig_in_filename != "") {
if (disambig_in_filename == "-") disambig_in_filename = "";
if (!ReadIntegerVectorSimple(disambig_in_filename, &disambig_syms_in))
KALDI_ERR << "add-self-loops: could not read disambig symbols from "
<<(disambig_in_filename == "" ?
"standard input" : disambig_in_filename);
}
TransitionModel trans_model;
ReadKaldiObject(model_in_filename, &trans_model);
fst::VectorFst<fst::StdArc> *fst =
fst::VectorFst<fst::StdArc>::Read(fst_in_filename);
if (!fst)
KALDI_ERR << "add-self-loops: error reading input FST.";
bool check_no_self_loops = true;
// The work gets done here.
AddSelfLoops(trans_model,
disambig_syms_in,
self_loop_scale,
reorder, check_no_self_loops, fst);
if (! fst->Write(fst_out_filename) )
KALDI_ERR << "add-self-loops: error writing FST to "
<< (fst_out_filename == "" ?
"standard output" : fst_out_filename);
delete fst;
return 0;
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
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