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src/ivectorbin/ivector-normalize-length.cc
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// ivectorbin/ivector-normalize-length.cc
// Copyright 2013 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/am-diag-gmm.h"
#include "ivector/ivector-extractor.h"
#include "util/kaldi-thread.h"
int main(int argc, char *argv[]) {
using namespace kaldi;
typedef kaldi::int32 int32;
try {
const char *usage =
"Normalize length of iVectors to equal sqrt(feature-dimension)
"
"
"
"Usage: ivector-normalize-length [options] <ivector-rspecifier> "
"<ivector-wspecifier>
"
"e.g.:
"
" ivector-normalize-length ark:ivectors.ark ark:normalized_ivectors.ark
";
ParseOptions po(usage);
bool normalize = true;
po.Register("normalize", &normalize,
"Set this to false to disable normalization");
bool scaleup = true;
po.Register("scaleup", &scaleup,
"If 'true', the normalized iVector is scaled-up by 'sqrt(dim)'");
po.Read(argc, argv);
if (po.NumArgs() != 2) {
po.PrintUsage();
exit(1);
}
std::string ivector_rspecifier = po.GetArg(1),
ivector_wspecifier = po.GetArg(2);
int32 num_done = 0;
double tot_ratio = 0.0, tot_ratio2 = 0.0;
SequentialBaseFloatVectorReader ivector_reader(ivector_rspecifier);
BaseFloatVectorWriter ivector_writer(ivector_wspecifier);
for (; !ivector_reader.Done(); ivector_reader.Next()) {
std::string key = ivector_reader.Key();
Vector<BaseFloat> ivector = ivector_reader.Value();
BaseFloat norm = ivector.Norm(2.0);
BaseFloat ratio = norm / sqrt(ivector.Dim()); // how much larger it is
// than it would be, in
// expectation, if normally
if (!scaleup) ratio = norm;
KALDI_VLOG(2) << "Ratio for key " << key << " is " << ratio;
if (ratio == 0.0) {
KALDI_WARN << "Zero iVector";
} else {
if (normalize) ivector.Scale(1.0 / ratio);
}
ivector_writer.Write(key, ivector);
tot_ratio += ratio;
tot_ratio2 += ratio * ratio;
num_done++;
}
KALDI_LOG << "Processed " << num_done << " iVectors.";
if (num_done != 0) {
BaseFloat avg_ratio = tot_ratio / num_done,
ratio_stddev = sqrt(tot_ratio2 / num_done - avg_ratio * avg_ratio);
KALDI_LOG << "Average ratio of iVector to expected length was "
<< avg_ratio << ", standard deviation was " << ratio_stddev;
}
return (num_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
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