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195 lines
6.6 KiB
195 lines
6.6 KiB
#!/usr/bin/env perl
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# Copyright 2010-2011 Microsoft Corporation
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# 2013-2016 Johns Hopkins University (author: Daniel Povey)
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# 2015 Hainan Xu
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# 2015 Guoguo Chen
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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# WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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# MERCHANTABLITY OR NON-INFRINGEMENT.
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# See the Apache 2 License for the specific language governing permissions and
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# limitations under the License.
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# Adds disambiguation symbols to a lexicon.
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# Outputs still in the normal lexicon format.
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# Disambig syms are numbered #1, #2, #3, etc. (#0
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# reserved for symbol in grammar).
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# Outputs the number of disambig syms to the standard output.
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# With the --pron-probs option, expects the second field
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# of each lexicon line to be a pron-prob.
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# With the --sil-probs option, expects three additional
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# fields after the pron-prob, representing various components
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# of the silence probability model.
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$pron_probs = 0;
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$sil_probs = 0;
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$first_allowed_disambig = 1;
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for ($n = 1; $n <= 3 && @ARGV > 0; $n++) {
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if ($ARGV[0] eq "--pron-probs") {
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$pron_probs = 1;
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shift @ARGV;
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}
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if ($ARGV[0] eq "--sil-probs") {
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$sil_probs = 1;
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shift @ARGV;
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}
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if ($ARGV[0] eq "--first-allowed-disambig") {
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$first_allowed_disambig = 0 + $ARGV[1];
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if ($first_allowed_disambig < 1) {
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die "add_lex_disambig.pl: invalid --first-allowed-disambig option: $first_allowed_disambig\n";
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}
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shift @ARGV;
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shift @ARGV;
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}
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}
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if (@ARGV != 2) {
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die "Usage: add_lex_disambig.pl [opts] <lexicon-in> <lexicon-out>\n" .
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"This script adds disambiguation symbols to a lexicon in order to\n" .
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"make decoding graphs determinizable; it adds pseudo-phone\n" .
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"disambiguation symbols #1, #2 and so on at the ends of phones\n" .
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"to ensure that all pronunciations are different, and that none\n" .
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"is a prefix of another.\n" .
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"It prints to the standard output the number of the largest-numbered" .
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"disambiguation symbol that was used.\n" .
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"\n" .
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"Options: --pron-probs Expect pronunciation probabilities in the 2nd field\n" .
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" --sil-probs [should be with --pron-probs option]\n" .
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" Expect 3 extra fields after the pron-probs, for aspects of\n" .
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" the silence probability model\n" .
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" --first-allowed-disambig <n> The number of the first disambiguation symbol\n" .
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" that this script is allowed to add. By default this is\n" .
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" #1, but you can set this to a larger value using this option.\n" .
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"e.g.:\n" .
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" add_lex_disambig.pl lexicon.txt lexicon_disambig.txt\n" .
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" add_lex_disambig.pl --pron-probs lexiconp.txt lexiconp_disambig.txt\n" .
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" add_lex_disambig.pl --pron-probs --sil-probs lexiconp_silprob.txt lexiconp_silprob_disambig.txt\n";
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}
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$lexfn = shift @ARGV;
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$lexoutfn = shift @ARGV;
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open(L, "<$lexfn") || die "Error opening lexicon $lexfn";
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# (1) Read in the lexicon.
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@L = ( );
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while(<L>) {
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@A = split(" ", $_);
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push @L, join(" ", @A);
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}
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# (2) Work out the count of each phone-sequence in the
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# lexicon.
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foreach $l (@L) {
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@A = split(" ", $l);
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shift @A; # Remove word.
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if ($pron_probs) {
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$p = shift @A;
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if (!($p > 0.0 && $p <= 1.0)) { die "Bad lexicon line $l (expecting pron-prob as second field)"; }
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}
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if ($sil_probs) {
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$silp = shift @A;
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if (!($silp > 0.0 && $silp <= 1.0)) { die "Bad lexicon line $l for silprobs"; }
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$correction = shift @A;
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if ($correction <= 0.0) { die "Bad lexicon line $l for silprobs"; }
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$correction = shift @A;
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if ($correction <= 0.0) { die "Bad lexicon line $l for silprobs"; }
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}
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if (!(@A)) {
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die "Bad lexicon line $1, no phone in phone list";
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}
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$count{join(" ",@A)}++;
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}
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# (3) For each left sub-sequence of each phone-sequence, note down
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# that it exists (for identifying prefixes of longer strings).
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foreach $l (@L) {
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@A = split(" ", $l);
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shift @A; # Remove word.
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if ($pron_probs) { shift @A; } # remove pron-prob.
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if ($sil_probs) {
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shift @A; # Remove silprob
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shift @A; # Remove silprob
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}
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while(@A > 0) {
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pop @A; # Remove last phone
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$issubseq{join(" ",@A)} = 1;
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}
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}
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# (4) For each entry in the lexicon:
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# if the phone sequence is unique and is not a
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# prefix of another word, no diambig symbol.
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# Else output #1, or #2, #3, ... if the same phone-seq
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# has already been assigned a disambig symbol.
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open(O, ">$lexoutfn") || die "Opening lexicon file $lexoutfn for writing.\n";
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# max_disambig will always be the highest-numbered disambiguation symbol that
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# has been used so far.
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$max_disambig = $first_allowed_disambig - 1;
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foreach $l (@L) {
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@A = split(" ", $l);
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$word = shift @A;
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if ($pron_probs) {
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$pron_prob = shift @A;
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}
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if ($sil_probs) {
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$sil_word_prob = shift @A;
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$word_sil_correction = shift @A;
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$prev_nonsil_correction = shift @A
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}
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$phnseq = join(" ", @A);
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if (!defined $issubseq{$phnseq}
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&& $count{$phnseq} == 1) {
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; # Do nothing.
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} else {
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if ($phnseq eq "") { # need disambig symbols for the empty string
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# that are not use anywhere else.
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$max_disambig++;
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$reserved_for_the_empty_string{$max_disambig} = 1;
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$phnseq = "#$max_disambig";
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} else {
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$cur_disambig = $last_used_disambig_symbol_of{$phnseq};
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if (!defined $cur_disambig) {
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$cur_disambig = $first_allowed_disambig;
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} else {
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$cur_disambig++; # Get a number that has not been used yet for
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# this phone sequence.
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}
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while (defined $reserved_for_the_empty_string{$cur_disambig}) {
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$cur_disambig++;
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}
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if ($cur_disambig > $max_disambig) {
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$max_disambig = $cur_disambig;
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}
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$last_used_disambig_symbol_of{$phnseq} = $cur_disambig;
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$phnseq = $phnseq . " #" . $cur_disambig;
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}
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}
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if ($pron_probs) {
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if ($sil_probs) {
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print O "$word\t$pron_prob\t$sil_word_prob\t$word_sil_correction\t$prev_nonsil_correction\t$phnseq\n";
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} else {
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print O "$word\t$pron_prob\t$phnseq\n";
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}
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} else {
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print O "$word\t$phnseq\n";
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}
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}
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print $max_disambig . "\n"; |