gmm-transform-means-global.cc
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// gmmbin/gmm-transform-means-global.cc
// Copyright 2009-2011 Microsoft Corporation
// 2012-2014 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 "base/kaldi-common.h"
#include "util/common-utils.h"
#include "gmm/diag-gmm.h"
#include "tree/context-dep.h"
#include "hmm/transition-model.h"
#include "transform/mllt.h"
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
typedef kaldi::int32 int32;
const char *usage =
"Transform GMM means with linear or affine transform\n"
"This version for a single GMM, e.g. a UBM.\n"
"Useful when estimating MLLT/STC\n"
"Usage: gmm-transform-means-global <transform-matrix> <gmm-in> <gmm-out>\n"
"e.g.: gmm-transform-means-global 2.mat 2.dubm 3.dubm\n";
bool binary = true; // write in binary if true.
ParseOptions po(usage);
po.Register("binary", &binary, "Write output in binary mode");
po.Read(argc, argv);
if (po.NumArgs() != 3) {
po.PrintUsage();
exit(1);
}
std::string mat_rxfilename = po.GetArg(1),
gmm_in_rxfilename = po.GetArg(2),
gmm_out_wxfilename = po.GetArg(3);
Matrix<BaseFloat> mat;
ReadKaldiObject(mat_rxfilename, &mat);
DiagGmm gmm;
ReadKaldiObject(gmm_in_rxfilename, &gmm);
int32 dim = gmm.Dim();
if (mat.NumRows() != dim)
KALDI_ERR << "Transform matrix has " << mat.NumRows() << " rows but "
"model has dimension " << gmm.Dim();
if (mat.NumCols() != dim
&& mat.NumCols() != dim+1)
KALDI_ERR << "Transform matrix has " << mat.NumCols() << " columns but "
"model has dimension " << gmm.Dim() << " (neither a linear nor an "
"affine transform";
Matrix<BaseFloat> means;
gmm.GetMeans(&means);
Matrix<BaseFloat> new_means(means.NumRows(), means.NumCols());
if (mat.NumCols() == dim) { // linear case
// Right-multiply means by mat^T (equivalent to left-multiplying each
// row by mat).
new_means.AddMatMat(1.0, means, kNoTrans, mat, kTrans, 0.0);
} else { // affine case
Matrix<BaseFloat> means_ext(means.NumRows(), means.NumCols()+1);
means_ext.Set(1.0); // set all elems to 1.0
SubMatrix<BaseFloat> means_part(means_ext, 0, means.NumRows(),
0, means.NumCols());
means_part.CopyFromMat(means); // copy old part...
new_means.AddMatMat(1.0, means_ext, kNoTrans, mat, kTrans, 0.0);
}
gmm.SetMeans(new_means);
gmm.ComputeGconsts();
WriteKaldiObject(gmm, gmm_out_wxfilename, binary);
KALDI_LOG << "Written model to " << gmm_out_wxfilename;
return 0;
} catch(const std::exception &e) {
std::cerr << e.what() << '\n';
return -1;
}
}