Newer
Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
// bin/scale-post.cc
// Copyright 2009-2011 Chao Weng
// 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[]) {
try {
using namespace kaldi;
typedef kaldi::int32 int32;
const char *usage =
"compute the scale of MCE, which is used to scale posteriors\n"
"Usage: computer-mce-scale [option] num-score-rspecifier "
"den-score-rspecifier out-scale-wspecifier\n";
ParseOptions po(usage);
kaldi::BaseFloat mce_alpha = 1.0, mce_beta = 0.0;
po.Register("mce-alpha", &mce_alpha, "alpha parameter for sigmoid");
po.Register("mce-beta", &mce_beta, "beta parameter for sigmoid");
po.Read(argc, argv);
if (po.NumArgs() != 3) {
po.PrintUsage();
exit(1);
}
std::string num_score_rspecifier = po.GetArg(1);
std::string den_score_rspecifier = po.GetArg(2);
std::string scale_wspecifier = po.GetArg(3);
kaldi::SequentialBaseFloatReader num_score_reader(num_score_rspecifier);
kaldi::RandomAccessBaseFloatReader den_score_reader(den_score_rspecifier);
kaldi::BaseFloatWriter scale_writer(scale_wspecifier);
int32 num_scaled = 0, num_no_score = 0;
for (; !num_score_reader.Done(); num_score_reader.Next()) {
std::string key = num_score_reader.Key();
kaldi::BaseFloat num_score = num_score_reader.Value();
num_score_reader.FreeCurrent();
if (!den_score_reader.HasKey(key)) {
num_no_score++;
} else {
//calculat the sigmoid scaling factor for MCE
// = \alpha * sigmoid(num - den) * (1 - sigmoid(num - den))
BaseFloat den_score = den_score_reader.Value(key);
BaseFloat score_difference = mce_alpha * (num_score - den_score) + mce_beta;
BaseFloat sigmoid_difference = 1.0 / (1.0 + exp(score_difference));
BaseFloat scale = mce_alpha * sigmoid_difference * (1 - sigmoid_difference);
scale_writer.Write(key, scale);
num_scaled++;
}
}
KALDI_LOG << num_scaled << " scales generated; " << num_no_score
<< " had no num/den scores.";
return (num_scaled != 0 ? 0 : 1);
} catch(const std::exception& e) {
std::cerr << e.what();
return -1;
}
}