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src/online2bin/ivector-randomize.cc
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// online2bin/ivector-randomize.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/transform-common.h"
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
const char *usage =
"Copy matrices of online-estimated iVectors, but randomize them;
"
"this is intended primarily for training the online nnet2 setup
"
"with iVectors. For each input matrix, each row with index t is,
"
"with probability given by the option --randomize-prob, replaced
"
"with the contents an input row chosen randomly from the interval [t, T]
"
"where T is the index of the last row of the matrix.
"
"
"
"Usage: ivector-randomize [options] <ivector-rspecifier> <ivector-wspecifier>
"
" e.g.: ivector-randomize ark:- ark:-
"
"See also: ivector-extract-online, ivector-extract-online2, subsample-feats
";
int32 srand_seed = 0;
BaseFloat randomize_prob = 0.5;
ParseOptions po(usage);
po.Register("srand", &srand_seed, "Seed for random number generator");
po.Register("randomize-prob", &randomize_prob, "For each row, replace it with a "
"random row with this probability.");
po.Read(argc, argv);
if (po.NumArgs() != 2) {
po.PrintUsage();
exit(1);
}
std::string ivector_rspecifier = po.GetArg(1),
ivector_wspecifier = po.GetArg(2);
int num_done = 0;
SequentialBaseFloatMatrixReader reader(ivector_rspecifier);
BaseFloatMatrixWriter writer(ivector_wspecifier);
for (; !reader.Done(); reader.Next(), num_done++) {
std::string utt = reader.Key();
const Matrix<BaseFloat> &ivectors_in = reader.Value();
int32 T = ivectors_in.NumRows(), dim = ivectors_in.NumCols();
Matrix<BaseFloat> ivectors_out(T, dim, kUndefined);
for (int32 t = 0; t < T; t++) {
int32 t_src;
if (WithProb(randomize_prob)) t_src = RandInt(t, T-1);
else t_src = t;
ivectors_out.Row(t).CopyFromVec(ivectors_in.Row(t_src));
}
writer.Write(utt, ivectors_out);
num_done++;
}
KALDI_LOG << "Randomized " << num_done << " iVectors.";
return (num_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
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