modify-cmvn-stats.cc
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// featbin/modify-cmvn-stats.cc
// Copyright 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 "matrix/kaldi-matrix.h"
#include "transform/cmvn.h"
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
const char *usage =
"Copy cepstral mean/variance stats so that some dimensions have 'fake' stats\n"
"that will skip normalization\n"
"Usage: modify-cmvn-stats [options] [<fake-dims>] <in-rspecifier> <out-wspecifier>\n"
"e.g.: modify-cmvn-stats 13:14:15 ark:- ark:-\n"
"or: modify-cmvn-stats --convert-to-mean-and-var=true ark:- ark:-\n"
"See also: compute-cmvn-stats\n";
bool convert_to_mean_and_var = false;
ParseOptions po(usage);
po.Register("convert-to-mean-and-var", &convert_to_mean_and_var,
"If true, convert the stats to a matrix containing the mean "
"and the centered variance in each dimension");
po.Read(argc, argv);
if (po.NumArgs() != 2 && po.NumArgs() != 3) {
po.PrintUsage();
exit(1);
}
int32 num_done = 0;
std::string skip_dims_str, rspecifier, wspecifier;
if (po.NumArgs() == 3) {
skip_dims_str = po.GetArg(1);
rspecifier = po.GetArg(2);
wspecifier = po.GetArg(3);
} else {
rspecifier = po.GetArg(1);
wspecifier = po.GetArg(2);
}
std::vector<int32> skip_dims;
if (!SplitStringToIntegers(skip_dims_str, ":", false, &skip_dims)) {
KALDI_ERR << "Bad first argument (should be colon-separated list of "
<< "integers)";
}
SequentialDoubleMatrixReader reader(rspecifier);
DoubleMatrixWriter writer(wspecifier);
for (; !reader.Done(); reader.Next()) {
Matrix<double> mat(reader.Value());
if (mat.NumRows() != 2)
KALDI_ERR << "Expected input to be CMVN stats (should have two rows)";
FakeStatsForSomeDims(skip_dims, &mat);
if (!convert_to_mean_and_var) {
writer.Write(reader.Key(), mat);
num_done++;
} else {
int32 dim = mat.NumCols() - 1;
double count = mat(0, dim);
Matrix<double> modified_mat(2, dim);
if (count <= 0.0) {
KALDI_WARN << "Zero or negative count for speaker " << reader.Key()
<< ", not outputting mean and variance stats.";
continue;
}
for (int32 i = 0; i < dim; i++) {
double mean = mat(0, i) / count,
variance = mat(1, i) / count - mean * mean;
modified_mat(0, i) = mean;
modified_mat(1, i) = variance;
}
writer.Write(reader.Key(), modified_mat);
num_done++;
}
}
KALDI_LOG << "Modified " << num_done << " sets of stats.";
return (num_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}