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scripts/rnnlm/initialize_matrix.pl
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#!/usr/bin/env perl
# Copyright 2017 Hossein Hadian
# 2017 Aswin Shanmugam Subramanian
$randseed = 0;
$shifted = 0;
do {
$shifted=0;
if ($ARGV[0] eq "--first-column") {
$first_column = $ARGV[1];
shift @ARGV; shift @ARGV;
$shifted = 1;
}
if ($ARGV[0] eq "--first-element") {
$first_element = $ARGV[1];
shift @ARGV; shift @ARGV;
$shifted = 1;
}
if ($ARGV[0] eq "--srand") {
$randseed = $ARGV[1];
shift @ARGV; shift @ARGV;
$shifted = 1;
}
if ($ARGV[0] eq "--stddev") {
$stddev = $ARGV[1];
shift @ARGV; shift @ARGV;
$shifted = 1;
}
} while ($shifted);
if(@ARGV != 2) {
die "Usage: $0 [--srand <int>] [--first-column <float>] [--first-element <float>]" .
"[--stddev <float>] <num-rows> <num-cols> > matrix.txt
" .
"This script is used to randomly initialize
" .
"Kaldi-format matrices, with supplied dimensions and
" .
"standard deviation.
"
}
($num_rows, $num_cols) = @ARGV;
$stddev = 1.0 / sqrt($num_cols) if not defined $stddev;
srand($randseed);
my $pi2 = 6.2831853;
print "[ ";
for ($i = 0; $i < $num_rows; $i++) {
for ($j = 0; $j < $num_cols; $j++) {
$flag = 0;
if ($j == 0 && defined $first_column) {
$element1 = $first_column;
$flag = 1;
} elsif ($i == 0 && $j == 0 && defined $first_element) {
$element1 = $first_element;
$flag = 1;
} elsif ($stddev == 0) {
$element1 = 0;
$element2 = 0;
} else {
$a = rand();
$b = rand();
$u1 = sqrt(-2 * log($a));
$u2 = $pi2*$b;
$element1 = $u1 * cos($u2);
$element2 = $u1 * sin($u2);
$element1 = $element1 * $stddev;
$element2 = $element2 * $stddev;
}
printf "%0.2f ", $element1;
if ($j != $num_cols - 1 && $flag != 1) {
printf "%0.2f ", $element2;
$j = $j + 1;
}
}
print "
";
}
print "]
";
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