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egs/mini_librispeech/s5/local/kws/generate_hitlist.pl
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#!/usr/bin/env perl
#===============================================================================
# Copyright 2018 (Author: Yenda Trmal <jtrmal@gmail.com>)
#
# 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.
#===============================================================================
# this will generate the hitlist (list of all hits) using the word-level
# alignments
# Format of the file
# utt-id word-1 duration-1 ; word-2 duration-2 ; ....
# it is exactly the same format that you can get from ali-to-phones with
# parameter --write-lengths (see the script create_hitlist.sh for complete
# example)
# The script is not very optimized -- the finding of the hits in the utterance
# is done by concatenating the word_ids sequence using '|' and then by searching
# for a substring processed the same way. After that, we workout the word-level
# indices of the individual hits (remember, there may be more hits per utterance)
# Probably still faster than rolling our own searching algorithm due to the fact
# that it goes directly to (optimized) perl's runtime function
use strict;
use warnings;
use utf8;
if ((scalar @ARGV > 2) || (scalar @ARGV < 1)) {
print STDERR "Usage: $0 <keywords.int> [<alignment>]
";
print STDERR "E.g.
";
print STDERR " $0 data/train_clean_5/kws/keywords.int < exp/tri3b_ali_train_clean_5/align.txt
";
die "Incorrect number of arguments."
}
my $keyword_file = shift @ARGV;
open(my $keywords, "<$keyword_file") or
die "Cannot open $keyword_file for reading";
my @KW;
while (<$keywords>) {
chomp;
next unless $_;
my @F = split;
my $kwid = shift @F;
push @KW, [$kwid, \@F];
}
while (<>) {
chomp;
next unless $_;
my @F = split(" ", $_, 2);
my $utt_id = shift @F;
@F = split(/ ; /, $F[0]);
my $frames_prev = 0;
my @UTT;
foreach my $entry (@F) {
(my $word, my $frames) = split(" ", $entry, 2);
if ($word ne 0) {
my $frames_start = $frames_prev;
my $frames_end = $frames_start + $frames;
$frames_prev = $frames_end;
push @UTT, [$word + 0, $frames_start, $frames_end];
} else {
$frames_prev += $frames;
}
}
my $utt_string = '|' . join('|', map { $_->[0] } @UTT) . '|';
my %utt_indices;
my $counter = 0;
my $idx = 0;
#mapping between the position in the utt_string and the position of
#the word in the original utterance
while () {
$idx = index($utt_string, '|', $idx);
last if $idx == -1;
$utt_indices{$idx} = $counter;
$idx += 1;
$counter +=1
}
foreach my $kw (@KW) {
my $kw_string = "|" . join('|', @{$kw->[1]}) . '|';
my $kwlen = scalar @{$kw->[1]};
my $idx = 0;
my @all_idx;
while () {
$idx = index($utt_string, $kw_string, $idx);
last if $idx == -1;
push @all_idx, $idx;
$idx += 1;
}
foreach my $hit (@all_idx) {
my $start_idx = $utt_indices{$hit};
my $end_idx = $start_idx + $kwlen - 1;
my $start = $UTT[$start_idx]->[1];
my $end = $UTT[$end_idx]->[2];
print "$kw->[0] $utt_id $start $end 0
";
}
}
}
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