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|
#!/usr/bin/perl -w
use strict;
use Getopt::Long "GetOptions";
my @grammars;
my $OUTPUTPREFIX = './giwork/bo.hier.grammar';
my $backoff_levels = 1;
my $glue_levels = 1;
my %FREQ_HIER = ();
usage() unless &GetOptions('grmr=s@' => \ @grammars,
'outprefix=s' => \ $OUTPUTPREFIX,
'bo-lvls=i' => \ $backoff_levels,
'glue-lvls=i' => \ $glue_levels,
);
my $OUTDIR = $OUTPUTPREFIX . '/hier';
my %grmr = ();
foreach my $grammar (@grammars) {
$grammar =~ m/\/[^\/]*\.t(\d+)\.[^\/]*$/;
my $grains = $1;
$grmr{$grains} = $grammar;
}
my @index = sort keys %grmr;
$OUTDIR = $OUTDIR . join('-',@index);
my $BACKOFF_GRMR = $OUTDIR . '/backoff.gz';
my $GLUE_GRMR = $OUTDIR . '/glue.gz';
my $joinedgrammars = $OUTDIR . '/grammar.hier.gz';
join_grammars();
for my $i (0..(scalar @index)-2) {
my $freqs = extract_freqs($index[$i], $index[$i+1]);
if ($i < $backoff_levels) {
create_backoff_rules($index[$i],$index[$i+1],$freqs);
}
if ($i < $glue_levels) {
add_glue_rules($index[$i]);
}
}
output_grammar_info();
sub usage {
print <<EOT;
Usage: $0 [OPTIONS] corpus.fr-en-al
Induces a grammar using Pitman-Yor topic modeling or Posterior Regularisation.
EOT
exit 1;
};
sub safesystem {
print STDERR "Executing: @_\n";
system(@_);
if ($? == -1) {
print STDERR "ERROR: Failed to execute: @_\n $!\n";
exit(1);
}
elsif ($? & 127) {
printf STDERR "ERROR: Execution of: @_\n died with signal %d, %s coredump\n",
($? & 127), ($? & 128) ? 'with' : 'without';
exit(1);
}
else {
my $exitcode = $? >> 8;
print STDERR "Exit code: $exitcode\n" if $exitcode;
return ! $exitcode;
}
}
sub join_grammars {
safesystem("echo \"\" | gzip > $joinedgrammars");
foreach my $i (@index) {
my $g = $grmr{$i};
safesystem("zcat $g | sed -r -e 's/(X[0-9]+)/\\1-$i/g' - | gzip > $g");
safesystem("zcat $joinedgrammars $g | gzip > $joinedgrammars");
}
}
sub extract_freqs {
my($grmr1,$grmr2) = @_;
print STDERR "\n!!!EXTRACTING FREQUENCIES: $grmr1->$grmr2\n";
my $IN_COARSE = substr($grammars{$grmr1},0,index($grammars{$grmr1},".grammar/")) . "/labeled_spans.txt";
my $IN_FINE = substr($grammars{$grmr2},0,index($grammars{$grmr2},".grammar/")) . "/labeled_spans.txt";
my $OUT_SPANS = "$OUTDIR/labeled_spans.hier$NUM_TOPICS_COARSE-$NUM_TOPICS_FINE.txt";
my $FREQS = "$OUTDIR/label_freq.hier$NUM_TOPICS_COARSE-$NUM_TOPICS_FINE.txt";
my %finehier = ();
if (-e $OUT_SPANS) {
print STDERR "$OUT_SPANS exists, reusing...\n";
} else {
safesystem("paste -d ' ' $IN_COARSE $IN_FINE > $OUT_SPANS");
}
open SPANS, $OUT_SPANS or die $!;
while (<SPANS>) {
my ($tmp, $coarse, $fine) = split /\|\|\|/;
my @coarse_spans = $coarse =~ /\d+-\d+:X(\d+)/g;
my @fine_spans = $fine =~ /\d+-\d+:X(\d+)/g;
foreach my $i (0..(scalar @coarse_spans)-1) {
my $coarse_cat = $coarse_spans[$i];
my $fine_cat = $fine_spans[$i];
$FREQ_HIER{$coarse_cat}{$fine_cat}++;
}
}
close SPANS;
foreach (values %FREQ_HIER) {
my $coarse_freq = $_;
my $total = 0;
$total+=$_ for (values %{ $coarse_freq });
$coarse_freq->{$_}=log($coarse_freq->{$_}/$total) for (keys %{ $coarse_freq });
}
open FREQS, ">", $FREQS or die $!;
foreach my $coarse_cat (keys %FREQ_HIER) {
print FREQS "$coarse_cat |||";
foreach my $fine_cat (keys %{$FREQ_HIER{$coarse_cat}}) {
my $freq = $FREQ_HIER{$coarse_cat}{$fine_cat};
print FREQS " $fine_cat:$freq";
if(! exists $finehier{$fine_cat} || $finehier{$fine_cat} < $freq) {
$finehier{$fine_cat} = $coarse_cat;
}
}
print FREQS "\n";
}
# foreach my $fine_cat (keys %finehier) {
# print FREQS "$fine_cat -> $finehier{$fine_cat}\n";
# }
close FREQS;
return $FREQS;
}
sub create_backoff_rules {
my ($grmr1, $grmr2, $freq) = @_;
open FREQS, $freqs or die $!;
open TMP, ">", "tmp" or die $!;
while (<FREQS>) {
my $coarse = m/^(\d+) \|\|\|/;
if ($coarse == $grmr1) {
my @finefreq = m/(\d+):(-?\d+\.?\d*)/g;
for(my $i = 0; $i < scalar @finefreq; $i+=2) {
my $finecat = @finefreq[$i];
my $finefreq = @finefreq[$i+1];
print TMP "[X$coarse-$grmr1] ||| [X$finecat-$grmr2,1]\t[1] ||| BackoffRule=$finefreq\n";
}
}
}
close TMP;
close FREQS;
safesystem('zcat $BACKOFF_GRMR | cat - tmp | gzip > $BACKOFF_GRMR');
}
sub add_glue_rules {
my ($grmr) = @_;
open TMP, ">", "tmp" or die $!;
for my $i (0..($grmr-1)) {
print TMP "[S] ||| [S,1] [X$i-$grmr,2] ||| [1] [2] ||| Glue=1\n";
print TMP "[S] ||| [X$i-$grmr,1] ||| [1] ||| GlueTop=1\n";
}
close TMP;
safesystem('zcat $GLUE_GRMR | cat - tmp | gzip > $GLUE_GRMR');
}
sub output_grammar_info {
print STDOUT "GRAMMAR: \t$joinedgrammars\n";
print STDOUT "GLUE: \t$GLUE_GRMR\n";
print STDOUT "BACKOFF: \t$BACKOFF_GRAMMAR\n";
}
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