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src/ivectorbin/ivector-compute-dot-products.cc
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// ivectorbin/ivector-compute-dot-products.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;
typedef kaldi::int64 int64;
try {
const char *usage =
"Computes dot-products between iVectors; useful in application of an
"
"iVector-based system. The 'trials-file' has lines of the form
"
"<key1> <key2>
"
"and the output will have the form
"
"<key1> <key2> [<dot-product>]
"
"(if either key could not be found, the dot-product field in the output
"
"will be absent, and this program will print a warning)
"
"
"
"Usage: ivector-compute-dot-products [options] <trials-in> "
"<ivector1-rspecifier> <ivector2-rspecifier> <scores-out>
"
"e.g.:
"
" ivector-compute-dot-products trials ark:train_ivectors.scp ark:test_ivectors.scp trials.scored
"
"See also: ivector-plda-scoring
";
ParseOptions po(usage);
po.Read(argc, argv);
if (po.NumArgs() != 4) {
po.PrintUsage();
exit(1);
}
std::string trials_rxfilename = po.GetArg(1),
ivector1_rspecifier = po.GetArg(2),
ivector2_rspecifier = po.GetArg(3),
scores_wxfilename = po.GetArg(4);
int64 num_done = 0, num_err = 0;
RandomAccessBaseFloatVectorReader ivector1_reader(ivector1_rspecifier);
RandomAccessBaseFloatVectorReader ivector2_reader(ivector2_rspecifier);
Input ki(trials_rxfilename);
bool binary = false;
Output ko(scores_wxfilename, binary);
double sum = 0.0, sumsq = 0.0;
std::string line;
while (std::getline(ki.Stream(), line)) {
std::vector<std::string> fields;
SplitStringToVector(line, " \t
\r", true, &fields);
if (fields.size() != 2) {
KALDI_ERR << "Bad line " << (num_done + num_err) << " in input "
<< "(expected two fields: key1 key2): " << line;
}
std::string key1 = fields[0], key2 = fields[1];
if (!ivector1_reader.HasKey(key1)) {
KALDI_WARN << "Key " << key1 << " not present in 1st table of ivectors.";
num_err++;
continue;
}
if (!ivector2_reader.HasKey(key2)) {
KALDI_WARN << "Key " << key2 << " not present in 2nd table of ivectors.";
num_err++;
continue;
}
const Vector<BaseFloat> &ivector1 = ivector1_reader.Value(key1),
&ivector2 = ivector2_reader.Value(key2);
// The following will crash if the dimensions differ, but
// they would likely also differ for all the ivectors so it's probably
// best to just crash.
BaseFloat dot_prod = VecVec(ivector1, ivector2);
sum += dot_prod;
sumsq += dot_prod * dot_prod;
num_done++;
ko.Stream() << key1 << ' ' << key2 << ' ' << dot_prod << std::endl;
}
if (num_done != 0) {
BaseFloat mean = sum / num_done, scatter = sumsq / num_done,
variance = scatter - mean * mean, stddev = sqrt(variance);
KALDI_LOG << "Mean dot-product was " << mean << ", standard deviation was "
<< stddev;
}
KALDI_LOG << "Processed " << num_done << " trials " << num_err
<< " had errors.";
return (num_done != 0 ? 0 : 1);
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}
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