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src/gmmbin/gmm-rescore-lattice.cc
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// gmmbin/gmm-rescore-lattice.cc
// Copyright 2009-2011 Saarland University (Author: Arnab Ghoshal)
// Cisco Systems (Author: Neha Agrawal)
// 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 "util/stl-utils.h"
#include "gmm/am-diag-gmm.h"
#include "hmm/transition-model.h"
#include "fstext/fstext-lib.h"
#include "lat/kaldi-lattice.h"
#include "lat/lattice-functions.h"
#include "gmm/decodable-am-diag-gmm.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 =
"Replace the acoustic scores on a lattice using a new model.
"
"Usage: gmm-rescore-lattice [options] <model-in> <lattice-rspecifier> "
"<feature-rspecifier> <lattice-wspecifier>
"
" e.g.: gmm-rescore-lattice 1.mdl ark:1.lats scp:trn.scp ark:2.lats
";
kaldi::BaseFloat old_acoustic_scale = 0.0;
kaldi::ParseOptions po(usage);
po.Register("old-acoustic-scale", &old_acoustic_scale,
"Add in the scores in the input lattices with this scale, rather "
"than discarding them.");
po.Read(argc, argv);
if (po.NumArgs() != 4) {
po.PrintUsage();
exit(1);
}
std::string model_filename = po.GetArg(1),
lats_rspecifier = po.GetArg(2),
feature_rspecifier = po.GetArg(3),
lats_wspecifier = po.GetArg(4);
AmDiagGmm am_gmm;
TransitionModel trans_model;
{
bool binary;
Input ki(model_filename, &binary);
trans_model.Read(ki.Stream(), binary);
am_gmm.Read(ki.Stream(), binary);
}
RandomAccessBaseFloatMatrixReader feature_reader(feature_rspecifier);
// Read as regular lattice
SequentialCompactLatticeReader compact_lattice_reader(lats_rspecifier);
// Write as compact lattice.
CompactLatticeWriter compact_lattice_writer(lats_wspecifier);
int32 num_done = 0, num_err = 0;
int64 num_frames = 0;
for (; !compact_lattice_reader.Done(); compact_lattice_reader.Next()) {
std::string key = compact_lattice_reader.Key();
if (!feature_reader.HasKey(key)) {
KALDI_WARN << "No feature found for utterance " << key << ". Skipping";
num_err++;
continue;
}
CompactLattice clat = compact_lattice_reader.Value();
compact_lattice_reader.FreeCurrent();
if (old_acoustic_scale != 1.0)
fst::ScaleLattice(fst::AcousticLatticeScale(old_acoustic_scale), &clat);
const Matrix<BaseFloat> &feats = feature_reader.Value(key);
DecodableAmDiagGmm gmm_decodable(am_gmm, trans_model, feats);
if (kaldi::RescoreCompactLattice(&gmm_decodable, &clat)) {
compact_lattice_writer.Write(key, clat);
num_done++;
num_frames += feats.NumRows();
} else num_err++;
}
KALDI_LOG << "Done " << num_done << " lattices with errors on "
<< num_err << ", #frames is " << num_frames;
return (num_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
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