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// bin/thresh-post.cc
// Copyright 2012 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 "gmm/am-diag-gmm.h"
#include "hmm/transition-model.h"
#include "hmm/hmm-utils.h"
#include "hmm/posterior.h"
int main(int argc, char *argv[]) {
using namespace kaldi;
typedef kaldi::int32 int32;
try {
const char *usage =
"Down-weight posteriors that are lower than a supplied confidence threshold.\n"
"(for those below the weight, rather than set to zero we downweight according\n"
"to the --weight option)\n"
"\n"
"Usage: thresh-post [options] <posteriors-rspecifier> <posteriors-wspecifier>\n"
"e.g.: thresh-post --threshold=0.9 --scale=0.1 ark:- ark:-\n";
ParseOptions po(usage);
BaseFloat threshold = 0.9;
BaseFloat scale = 0.1;
po.Register("threshold", &threshold, "Threshold below which we down-weight posteriors.");
po.Register("scale", &scale, "Scale which we apply to posteriors below the threshold.");
po.Read(argc, argv);
if (po.NumArgs() != 2) {
po.PrintUsage();
exit(1);
}
std::string posteriors_rspecifier = po.GetArg(1),
posteriors_wspecifier = po.GetArg(2);
KALDI_ASSERT(threshold < 1.0 && threshold >= 0.0 && scale >= 0.0 && scale <= 1.0);
int32 num_posteriors = 0;
double total_weight_in = 0.0, total_weight_out = 0.0;
SequentialPosteriorReader posterior_reader(posteriors_rspecifier);
PosteriorWriter posterior_writer(posteriors_wspecifier);
for (; !posterior_reader.Done(); posterior_reader.Next()) {
num_posteriors++;
// Posterior is vector<vector<pair<int32, BaseFloat> > >
const Posterior &posterior = posterior_reader.Value();
// Posterior is vector<vector<pair<int32, BaseFloat> > >
Posterior new_post(posterior.size());
for (size_t i = 0; i < posterior.size(); i++) {
for (size_t j = 0; j < posterior[i].size(); j++) {
int32 tid = posterior[i][j].first;
double weight = posterior[i][j].second;
total_weight_in += weight;
if (weight < threshold) weight *= scale;
total_weight_out += weight;
if (weight != 0.0)
new_post[i].push_back(std::make_pair(tid, static_cast<BaseFloat>(weight)));
}
}
posterior_writer.Write(posterior_reader.Key(), new_post);
}
KALDI_LOG << "thresh-post: thresholded " << num_posteriors
<< " posteriors, reduced them by a factor of "
<< (total_weight_out/total_weight_in) << " on average.";
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}