lattice-add-trans-probs.cc
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// latbin/lattice-add-trans-probs.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/common-utils.h"
#include "fstext/fstext-lib.h"
#include "lat/kaldi-lattice.h"
#include "lat/lattice-functions.h"
#include "hmm/transition-model.h"
#include "hmm/hmm-utils.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 =
"Add transition probabilities into graph part of lattice scores,\n"
"controlled by options --transition-scale and --self-loop-scale, which\n"
"for compatibility with the original graph, would normally be set to the same\n"
"values used in graph compilatoin\n"
"\n"
"Usage: lattice-add-trans-probs [options] model lattice-rspecifier lattice-wspecifier\n"
" e.g.: lattice-add-trans-probs --transition-scale=1.0 --self-loop-scale=0.1 1.mdl ark:in.lats ark:out.lats\n";
ParseOptions po(usage);
BaseFloat transition_scale = 1.0, self_loop_scale = 1.0;
po.Register("transition-scale", &transition_scale,
"Scale for transition probabilities (excluding self-loops)");
po.Register("self-loop-scale", &self_loop_scale,
"Probability scale for self-loop vs. non-self-loop "
"probability mass.");
po.Read(argc, argv);
if (po.NumArgs() != 3) {
po.PrintUsage();
exit(1);
}
std::string
model_rxfilename = po.GetArg(1),
lats_rspecifier = po.GetArg(2),
lats_wspecifier = po.GetArg(3);
int32 n_done = 0;
TransitionModel trans_model;
ReadKaldiObject(model_rxfilename, &trans_model);
SequentialLatticeReader lattice_reader(lats_rspecifier); // read as
// regular lattice.
CompactLatticeWriter clat_writer(lats_wspecifier); // write as compact.
for (; !lattice_reader.Done(); lattice_reader.Next(), n_done++) {
Lattice lat(lattice_reader.Value());
AddTransitionProbs(trans_model, transition_scale, self_loop_scale, &lat);
CompactLattice clat;
ConvertLattice(lat, &clat);
clat_writer.Write(lattice_reader.Key(), clat);
n_done++;
}
KALDI_LOG << "Done adding transition probabilities to " << n_done << " lattices.";
return (n_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}