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src/ivectorbin/ivector-subtract-global-mean.cc
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// ivectorbin/ivector-subtract-global-mean.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"
int main(int argc, char *argv[]) {
using namespace kaldi;
typedef kaldi::int32 int32;
try {
const char *usage =
"Copies a table of iVectors but subtracts the global mean as
"
"it does so. The mean may be specified as the first argument; if not,
"
"the sum of the input iVectors is used.
"
"
"
"Usage: ivector-subtract-global-mean <ivector-rspecifier> <ivector-wspecifier>
"
"or: ivector-subtract-global-mean <mean-rxfliename> <ivector-rspecifier> <ivector-wspecifier>
"
"e.g.: ivector-subtract-global-mean scp:ivectors.scp ark:-
"
"or: ivector-subtract-global-mean mean.vec scp:ivectors.scp ark:-
"
"See also: ivector-mean
";
ParseOptions po(usage);
bool subtract_mean = true;
po.Register("subtract-mean", &subtract_mean,
"If true, subtract mean; if false, just copy the input.");
po.Read(argc, argv);
if (po.NumArgs() < 2 || po.NumArgs() > 3) {
po.PrintUsage();
exit(1);
}
int64 num_done = 0;
if (po.NumArgs() == 2) {
std::string ivector_rspecifier = po.GetArg(1),
ivector_wspecifier = po.GetArg(2);
Vector<double> sum;
std::vector<std::pair<std::string, Vector<BaseFloat>*> > ivectors;
SequentialBaseFloatVectorReader ivector_reader(ivector_rspecifier);
BaseFloatVectorWriter ivector_writer(ivector_wspecifier);
for (; !ivector_reader.Done(); ivector_reader.Next()) {
std::string key = ivector_reader.Key();
const Vector<BaseFloat> &ivector = ivector_reader.Value();
if (sum.Dim() == 0) sum.Resize(ivector.Dim());
sum.AddVec(1.0, ivector);
num_done++;
ivectors.push_back(std::make_pair(key, new Vector<BaseFloat>(ivector)));
}
KALDI_LOG << "Read " << num_done << " iVectors.";
if (num_done != 0) {
KALDI_LOG << "Norm of iVector mean was " << (sum.Norm(2.0) / num_done);
for (size_t i = 0; i < ivectors.size(); i++) {
std::string key = ivectors[i].first;
Vector<BaseFloat> *ivector = ivectors[i].second;
if (subtract_mean)
ivector->AddVec(-1.0 / num_done, sum);
ivector_writer.Write(key, *ivector);
delete ivector;
ivectors[i].second = NULL;
}
}
} else {
// po.NumArgs() == 3
std::string mean_rxfilename = po.GetArg(1),
ivector_rspecifier = po.GetArg(2),
ivector_wspecifier = po.GetArg(3);
Vector<BaseFloat> mean;
ReadKaldiObject(mean_rxfilename, &mean);
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();
ivector.AddVec(-1.0, mean);
ivector_writer.Write(key, ivector);
num_done++;
}
}
KALDI_LOG << "Wrote " << num_done << " mean-subtracted iVectors";
return (num_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
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