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tiedeman committed cf4f79e

a blacklist classifier as a proper Perl module and a structure in the repository

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COPYING.LESSER.txt

-                   GNU LESSER GENERAL PUBLIC LICENSE
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COPYING.txt

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Lingua-Identify-Blacklists/Changes

+
+0.01	Tue Oct  9 14:48:09 CEST 2012
+	- first version of the blacklist classifier as a perl module
+

Lingua-Identify-Blacklists/Makefile.PL

+use inc::Module::Install;
+
+name          'Lingua::Identify::Blacklists';
+all_from      'lib/Lingua/Identify/Blacklists.pm';
+
+install_script 'bin/blacklist_classifier';
+install_share;
+
+# requires 'Getopt::Std'     => 0;
+# requires 'FindBin'     => 0;
+
+WriteAll;

Lingua-Identify-Blacklists/README

Empty file added.

Lingua-Identify-Blacklists/bin/blacklist_classifier

+#!/usr/bin/env perl
+#-*-perl-*-
+#
+#    Classifier for language discrimination based on blacklists v0.1
+#    Copyright 2012 Joerg Tiedemann
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Lesser General Public License as published
+#    by the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+#    GNU Lesser General Public License for more details.
+#
+#    You should have received a copy of the GNU Lesser General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+#-----------------------------------------------------------------------------
+# USAGE:
+#-----------------------------------------------------------------------------
+# classification:
+#   blacklist_classifier.pl [OPTIONS] lang1 lang2 ... < file
+#
+# training:
+#   blacklist_classifier.pl -n [OPTIONS] text1 text2 > blacklist.txt
+#   blacklist_classifier.pl [OPTIONS] -t "t1.txt t2.txt ..." lang1 lang2 ...
+#
+# run experiments:
+#   blacklist_classifier.pl -t "t1.txt t2.txt ..." \
+#                           -e "e1.txt e2.txt ..." \
+#                           lang1 lang2 ...
+#
+#-----------------------------------------------------------------------------
+#
+# - lang1 lang2 ... are language ID's
+# - blacklists are expected in <BlackListDir>/<lang1-lang2.txt
+# - t1.txt t2.txt ... are training data files (in UTF-8)
+# - e1.txt e2.txt ... are training data files (in UTF-8)
+# - the order of languages needs to be the same for training data, eval data
+#   as given by the command line arguments (lang1 lang2 ..)
+#
+#-----------------------------------------------------------------------------
+#
+# OPTIONS:
+#
+# -a <freq> ...... min freq for common words
+# -b <freq> ...... max freq for uncommon words
+# -c <score> ..... min difference score to be relevant
+# -d <dir> ....... directory of black lists
+# -i ............. classify each line separately
+# -m <number> .... use approximately <number> tokens to traing/classify
+# -n ............. train a new black list
+# -v ............. verbose mode
+#
+# -U ............. don't lowercase
+# -S ............. don't tokenize (use the string as it is)
+# -A ............. don't discard tokens with non-alphabetic characters
+
+
+use strict;
+use vars qw($opt_a $opt_b $opt_c $opt_m $opt_n $opt_d $opt_v $opt_i
+            $opt_t $opt_e $opt_F $opt_T $opt_L $opt_U $opt_S $opt_A $opt_M);
+use Getopt::Std;
+use FindBin qw($Bin);
+
+use lib "$Bin/../lib";
+use Lingua::Identify::Blacklists qw/:all/;
+
+
+getopts('a:b:c:d:im:nvt:e:F:T:L:USAM:');
+
+binmode(STDIN,":encoding(UTF-8)");
+binmode(STDOUT,":encoding(UTF-8)");
+binmode(STDERR,":encoding(UTF-8)");
+
+my %blacklists=();
+
+my $min_high = defined $opt_a ? $opt_a : 10;
+my $max_low  = defined $opt_b ? $opt_b : 3;
+my $min_diff = defined $opt_c ? $opt_c : 0.8;
+
+
+$Lingua::Identify::Blacklists::VERBOSE      = 1 if ($opt_v);
+$Lingua::Identify::Blacklists::BLACKLISTDIR = $opt_d if ($opt_d);
+
+unless (-d $Lingua::Identify::Blacklists::BLACKLISTDIR){
+    $Lingua::Identify::Blacklists::BLACKLISTDIR = "$Bin/../share/blacklists";
+}
+
+my $BlackListDir = $Lingua::Identify::Blacklists::BLACKLISTDIR;
+
+
+
+
+
+# run experiments with a given set of training corpora and 
+# a set of evaluation corpora
+
+if ($opt_e){
+    my @langs = @ARGV;
+    # run an experiment with exponentially increasing training sizes
+    # from $opt_F to $opt_T
+    if ($opt_F && $opt_T && $opt_L){
+        $opt_m = $opt_F;
+        while ($opt_m < $opt_T){
+            %blacklists=();
+            print "train with ca $opt_m tokens\n";
+            &run_experiment($opt_t,$opt_e,@langs);
+            $opt_m *= $opt_L;
+        }
+    }
+    &run_experiment($opt_t,$opt_e,@langs);
+    exit;
+}
+
+
+# train new black lists
+
+if ($opt_t){
+    my @traindata = split(/\s+/,$opt_t);
+    my @langs = @ARGV;
+    &batch_train(\@langs,\@traindata);
+}
+elsif ($opt_n){
+    my $file1=shift(@ARGV);
+    my $file2=shift(@ARGV);
+    &train($file1,$file2);
+}
+
+
+# classify
+
+else{
+    my @langs = @ARGV;
+    @ARGV = ();
+    my @predictions = &identify_stdin( langs => \@langs, every_line => $opt_i );
+    print join("\n",@predictions);
+    print "\n";
+}
+
+
+
+
+
+sub batch_train{
+    my $langs = shift;
+    my $traindata = shift;
+
+    die "no languages given\n" unless (ref($langs) eq 'ARRAY');
+    die "no training data given\n" unless (ref($traindata) eq 'ARRAY');
+    die "number of languages and training data does not match\n" 
+        unless ($#{$traindata} == $#{$langs});
+
+    for my $s (0..$#{$langs}){
+        for my $t ($s+1..$#{$langs}){
+            print STDERR "traing blacklist for $$langs[$s]-$$langs[$t]\n";
+            &train($$traindata[$s],$$traindata[$t],
+                   "$Lingua::Identify::Blacklists::BLACKLISTDIR/$$langs[$s]-$$langs[$t].txt");
+        }
+    }
+}
+
+
+sub train{
+    my ($file1,$file2,$outfile) = @_;
+
+    my %dic1=();
+    my %dic2=();
+
+    my ($total1,$total2);
+
+    my $total1 = &Lingua::Identify::Blacklists::read_file($file1,\%dic1,$opt_m);
+    my $total2 = &Lingua::Identify::Blacklists::read_file($file2,\%dic2,$opt_m);
+
+    if ($outfile){
+        system("mkdir -p $Lingua::Identify::Blacklists::BLACKLISTDIR") unless (-d $Lingua::Identify::Blacklists::BLACKLISTDIR);
+        open O,">$outfile" || die "cannot write to $outfile\n";
+        binmode(O,":encoding(UTF-8)");
+    }
+
+    foreach my $w (keys %dic1){
+	next if ($dic1{$w}<$min_high && $dic2{$w}<$min_high);
+	next if ($dic1{$w}>$max_low && $dic2{$w}>$max_low);
+
+        my $s1 = $dic1{$w} * $total2;
+        my $s2 = $dic2{$w} * $total1;
+        my $diff = ($s1 - $s2) / ($s1 + $s2);
+
+	if (abs($diff) > $min_diff){
+            if ($outfile){
+                print O "$diff\t$w\t$dic1{$w}\t$dic2{$w}\n";
+            }
+            else{
+                print "$diff\t$w\t$dic1{$w}\t$dic2{$w}\n";
+            }
+	}
+    }
+    # don't forget words that do NOT appear in dic1!!!
+    foreach my $w (keys %dic2){
+	next if (exists $dic1{$w});
+	next if ($dic2{$w}<10);
+        if ($outfile){
+            print O "-1\t$w\t$dic1{$w}\t$dic2{$w}\n";
+        }
+        else{
+            print "-1\t$w\t$dic1{$w}\t$dic2{$w}\n";
+        }
+    }
+    close O if ($outfile);
+}
+
+
+
+
+
+
+sub run_experiment{
+
+    use Benchmark;
+
+    my $trainfiles = shift;
+    my $evalfiles = shift;
+
+    my @traindata = split(/\s+/,$trainfiles);
+    my @evaldata = split(/\s+/,$evalfiles);
+    my @langs = @_;
+
+    die "no languages given!\n" unless (@langs);
+    die "no training nor evaluation data given!\n" 
+        unless ($#traindata == $#evaldata || $#traindata == $#langs);
+
+    # train blacklists
+
+    if ($#traindata == $#langs){
+        $Lingua::Identify::Blacklists::BLACKLISTDIR = $opt_d || "blacklist-experiment";
+        my $t1 = new Benchmark;
+        &batch_train(\@langs,\@traindata);
+        print STDERR "training took: ".
+            timestr(timediff(new Benchmark, $t1)).".\n";
+    }
+
+    # classify test data
+
+    if ($#evaldata == $#langs){
+        print STDERR "classify ....\n";
+
+        my $correct=0;
+        my $count=0;
+        my %guesses=();
+
+        my %correct_lang=();
+        my %count_lang=();
+
+        my $t1 = new Benchmark;
+        foreach my $i (0..$#langs){
+            open IN,"<:encoding(UTF-8)",$evaldata[$i] || die "...";
+            while (<IN>){
+                chomp;
+                my %dic = ();
+                &Lingua::Identify::Blacklists::process_string($_,\%dic);
+                my $guess = &Lingua::Identify::Blacklists::classify(\%dic,@langs);
+                $count++;
+                $count_lang{$langs[$i]}++;
+                if ($guess eq $langs[$i]){
+                    $correct++;
+                    $correct_lang{$langs[$i]}++;
+                }
+                $guesses{$langs[$i]}{$guess}++;
+            }
+            close IN;
+        }
+        print STDERR "classification took: ".
+            timestr(timediff(new Benchmark, $t1)).".\n";
+
+        printf "accuracy: %6.4f\n   ",$correct/$count;
+        foreach my $c (@langs){
+            print "  $c";
+        }
+        print "\n";
+        foreach my $c (@langs){
+            print "$c ";
+            foreach my $g (@langs){
+                printf "%4d",$guesses{$c}{$g};
+            }
+            printf "  %6.4f",$correct_lang{$c}/$count_lang{$c};
+            print "\n";
+        }
+    }
+    system("wc -l $Lingua::Identify::Blacklists::BLACKLISTDIR/*.txt");
+}
+

Lingua-Identify-Blacklists/lib/Lingua/Identify/Blacklists.pm

+#-*-perl-*-
+
+package Lingua::Identify::Blacklists;
+
+use 5.008;
+use strict;
+use warnings;
+
+use File::ShareDir 'dist_dir';
+
+use Exporter 'import';
+our @EXPORT = qw( identify identify_file identify_stdin );
+our %EXPORT_TAGS = ( all => \@EXPORT );
+
+=encoding UTF-8
+
+=head1 NAME
+
+Lingua::Identify::Blacklists - Language identification for related languages based on blacklists
+
+=head1 VERSION
+
+Version 0.01
+
+=cut
+
+our $VERSION = '0.01';
+our $VERBOSE = 0;
+
+
+our $BLACKLISTDIR;
+eval{ $BLACKLISTDIR = &dist_dir('Lingua-Identify-Blacklists') . '/blacklists' };
+
+our $LOWERCASE = 1;
+our $TOKENIZE = 1;
+our $ALPHA_ONLY = 1;
+
+my %blacklists = ();
+
+
+
+sub identify{
+  my $text = shift;
+  my %options = @_;
+
+  my %dic = ();
+  my $total = 0;
+
+  &process_string( $text, \%dic, $total );
+  return &classify( \%dic, %options );
+}
+
+
+sub identify_stdin{
+    return identify_file( undef, @_ );
+}
+
+
+sub identify_file{
+    my $file = shift;
+    my %options = @_;
+    
+    my %dic = ();
+    my $total = 0;
+    my @predictions = ();
+    
+    my $fh = *STDIN;
+    if (defined $file){
+	open $fh,"<$file" || die "cannot read from '$file'\n";
+	binmode($fh,":encoding(UTF-8)");
+    }
+    
+    while (<$fh>){
+	chomp;
+	&process_string($_,\%dic,$total);
+	if ($options{every_line}){                        # classify every line separately
+            push( @predictions, &classify( \%dic, %options ) );
+            %dic=();
+	}
+	elsif ($options{text_size}){                     # use only a certain number of words
+	    if ($total > $options{text_size}){
+		print STDERR "use $total tokens for classification\n" if ($VERBOSE);
+		last;
+	    }
+	}
+    }
+    unless ($options{every_line}){
+	push( @predictions, &classify( \%dic, %options ) );
+    }
+    return @predictions;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+sub classify{
+    my $dic         = shift;
+    my %options     = @_;
+    $options{langs} = '' unless ($options{langs});
+
+    my @langs = ref($options{langs}) eq 'ARRAY' ? 
+	@{$options{langs}} : split( /\s+/, $options{langs} ) ;
+
+    @langs = available_languages() unless (@langs);
+
+    return &classify_with_margin( $dic, $options{use_margin}, @langs ) 
+	if ($options{use_margin});
+    return &classify_cascaded( $dic, @langs );
+}
+
+
+
+
+sub available_languages{
+    unless (keys %blacklists){
+	&load_all_blacklists( $BLACKLISTDIR );
+    }
+    my %langs = ();
+    foreach (keys %blacklists){
+	my ($lang1,$lang2) = split(/\-/);
+	$langs{$lang1}=1;
+	$langs{$lang2}=1;
+    }
+    return keys %langs;
+}
+
+
+
+sub classify_cascaded{
+    my $dic = shift;
+    my @langs = @_;
+
+    my $lang1 = shift(@langs);
+    foreach my $lang2 (@langs){
+
+        # load blacklists on demand
+        unless (exists $blacklists{"$lang1-$lang2"}){
+            $blacklists{"$lang1-$lang2"}={};
+            &load_blacklist($blacklists{"$lang1-$lang2"},
+                            $BLACKLISTDIR,$lang1,$lang2);
+        }
+        my $list = $blacklists{"$lang1-$lang2"};
+
+        my $score = 0;
+	foreach my $w (keys %{$dic}){
+	    if (exists $$list{$w}){
+                $score += $$dic{$w} * $$list{$w};
+                print STDERR "$$dic{$w} x $w found ($$list{$w})\n" if ($VERBOSE);
+            }
+        }
+        if ($score < 0){
+            $lang1 = $lang2;
+        }
+        print STDERR "select $lang1 ($score)\n" if ($VERBOSE);
+    }
+    return $lang1;
+}
+
+
+# OTHER WAY OF CLASSIFYING
+# test all against all ...
+
+sub classify_with_margin{
+    my $dic = shift;
+    my $margin = shift;
+    my @langs = @_;
+
+    my %selected = ();
+    while (@langs){
+        my $lang1 = shift(@langs);
+        foreach my $lang2 (@langs){
+
+            # load blacklists on demand
+            unless (exists $blacklists{"$lang1-$lang2"}){
+                $blacklists{"$lang1-$lang2"}={};
+                &load_blacklist($blacklists{"$lang1-$lang2"},
+                                $BLACKLISTDIR,$lang1,$lang2);
+            }
+            my $list = $blacklists{"$lang1-$lang2"};
+
+            my $score = 0;
+            foreach my $w (keys %{$dic}){
+                if (exists $$list{$w}){
+                    $score += $$dic{$w} * $$list{$w};
+                    print STDERR "$$dic{$w} x $w found ($$list{$w})\n" 
+                        if ($VERBOSE);
+                }
+            }
+            next if (abs($score) < $margin);
+            if ($score < 0){
+                # $selected{$lang2}-=$score;
+                $selected{$lang2}++;
+                print STDERR "select $lang2 ($score)\n" if ($VERBOSE);
+            }
+            else{
+                # $selected{$lang1}+=$score;
+                $selected{$lang1}++;
+                print STDERR "select $lang1 ($score)\n" if ($VERBOSE);
+            }
+        }
+    }
+    my ($best) = sort { $selected{$b} <=> $selected{$a} } keys %selected;
+    return $best;
+}
+
+
+
+
+sub load_all_blacklists{
+    my $dir = shift;
+
+    opendir(my $dh, $dir) || die "cannot read directory '$dir'\n";
+    while(readdir $dh) {
+	if (/^(.*)-(.*).txt$/){
+	    $blacklists{"$1-$2"}={};
+	    &load_blacklist($blacklists{"$1-$2"}, $dir, $1, $2);
+	}
+    }
+    closedir $dh;
+}
+
+
+sub load_blacklist{
+    my ($list,$dir,$lang1,$lang2) = @_;
+
+    my $inverse = 0;
+    if (! -e "$dir/$lang1-$lang2.txt"){
+	($lang1,$lang2) = ($lang2,$lang1);
+        $inverse = 1;
+    }
+
+    open F,"<:encoding(UTF-8)","$dir/$lang1-$lang2.txt" || die "...";
+    while (<F>){
+	chomp;
+	my ($score,$word) = split(/\t/);
+        $$list{$word} = $inverse ? 0-$score : $score;
+    }
+    close F;
+}
+
+
+
+
+
+
+sub read_file{
+    my ($file,$dic,$max)=@_;
+    my $total = 0;
+    if ($file=~/\.gz$/){
+	open F,"gzip -cd < $file |" || die "...";
+	binmode(F,":encoding(UTF-8)");
+    }
+    else{
+	open F,"<:encoding(UTF-8)",$file || die "...";
+    }
+    while (<F>){
+	chomp;
+        &process_string($_,$dic,$total);
+        if ($max){
+            if ($total > $max){
+                print STDERR "read $total tokens from $file\n";
+                last;
+            }
+        }
+    }
+    close F;
+    return $total;
+}
+
+
+
+
+# process_string($string,\%dic,\$wordcount)
+
+sub process_string{
+    $_[0]=lc($_[0]) if ($LOWERCASE);
+    $_[0]=~s/((\A|\s)\P{IsAlpha}+|\P{IsAlpha}+(\s|\Z))/ /gs if ($TOKENIZE);
+
+    my @words = $ALPHA_ONLY ? 
+        grep(/^\p{IsAlpha}/,split(/\s+/,$_[0])) :
+        split(/\s+/,$_[0]);
+
+    foreach my $w (@words){${$_[1]}{$w}++;$_[2]++;}
+}
+
+
+1;
+
+
+__END__
+
+
+=head1 AUTHOR
+
+Jörg Tiedemann, L<https://bitbucket.org/tiedemann>
+
+=head1 BUGS
+
+Please report any bugs or feature requests to
+L<https://bitbucket.org/tiedemann/blacklist-classifier>.  I will be notified,
+and then you'll automatically be notified of progress on your bug as I
+make changes.
+
+=head1 SUPPORT
+
+You can find documentation for this module with the perldoc command.
+
+    perldoc Lingua::Identify::Blacklists
+
+=head1 LICENSE AND COPYRIGHT
+
+   Copyright 2012 Jörg Tiedemann.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as published
+   by the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+=cut

Lingua-Identify-Blacklists/share/blacklists/hr-bs.txt

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