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#! /usr/bin/perl
#*****************************************************************************
# IrstLM: IRST Language Model Toolkit
# Copyright (C) 2007 Marcello Federico, ITC-irst Trento, Italy
# This library 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 2.1 of the License, or (at your option) any later version.
# This library 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 library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#******************************************************************************
#usage:
#split-dict.pl <input> <output> <parts>
#It splits the <input> dictionary into <parts> dictionaries
#(named <output000>, ... <output999>)
#splitting is balanced wrt to frequency of the <input> dictionary
#if not available a frequency of 1 is considered
use strict;
use Getopt::Long "GetOptions";
use File::Basename;
my ($help,$input,$output,$parts)=();
$help=1 unless
&GetOptions('input=s' => \$input,
'output=s' => \$output,
'parts=i' => \$parts,
'h|help' => \$help,);
if ($help || !$input || !$output || !$parts) {
my $cmnd = basename($0);
print "\n$cmnd - splits a dictionary into frequency-balanced partitions\n",
"\nUSAGE:\n",
" $cmnd [options]\n",
"\nDESCRIPTION:\n",
" $cmnd splits a dictionary into frequency-balanced partitions.\n",
" The dictionary must be generated with IRSTLM command dict.\n",
" If dictionary does not contain frequencies, then a frequency 1 is\n",
" assumed for all words.\n",
"\nOPTIONS:\n",
" --input <string> input dictionary with frequencies\n",
" --output <string> prefix of output dictionaries\n",
" --parts <int> number of partitions to create\n",
" -h, --help (optional) print these instructions\n",
"\n";
exit(1);
}
my $freqflag=0;
my ($w,$f,$globf,$thr);
my (@D,@F,%S,@C);
open(IN,"$input");
chomp($_=<IN>);
#if input is a dictionary.
if (/^dictionary[ \t]+\d+[ \t]+\d+$/i){
my ($dummy,$size);
($dummy,$dummy,$size)=split(/[ \t]+/,$_);
$freqflag=1 if /DICTIONARY/;
}
$globf=0;
while(chomp($_=<IN>)){
if ($freqflag){
($w,$f)=split(/[ \t]+/,$_);
}
else{
$w=$_;
$f=1;
}
push @D, $w;
push @F, $f;
$globf+=$f;
}
close (IN);
$thr=$globf/$parts;
my $totf=0;
print STDERR "Dictionary 0: (thr: $thr , $globf, $totf , $parts)\n";
my $sfx=0;
my $w;
for (my $i=0;$i<=$#D;$i++){
# if the remaining words are less than or equal to
# the number of remaining sub-dictionaries to create
# put only one word per each sub-dictionary.
if (($totf>0) && ($#D+1-$i) <= ($parts-1-$sfx)){
# recompute threshold on the remaining global frequency
# according to the number of remaining parts
$sfx++;
$globf-=$totf;
$thr=($globf)/($parts-$sfx);
print STDERR "Dictionary $sfx: (thr: $thr , $globf , $totf , ",($parts-$sfx),")\n";
$totf=0;
}
$totf+=$F[$i];
$w=$D[$i];
$S{$w}=$sfx;
$C[$sfx]++;
if ($totf>$thr){
# recompute threshold on the remaining global frequency
# according to the number of remaining parts
$sfx++;
$globf-=$totf;
$thr=($globf)/($parts-$sfx);
print STDERR "Dictionary $sfx: (thr: $thr , $globf , $totf , ",($parts-$sfx),")\n";
$totf=0;
}
}
my $oldsfx=-1;
for (my $i=0;$i<=$#D;$i++){
$w=$D[$i];
$sfx="0000$S{$w}";
$sfx=~s/.+(\d{3})/$1/;
if ($sfx != $oldsfx){
#print STDERR "opening $output$sfx\n";
close (OUT) if $oldsfx!= -1;
open(OUT,">$output$sfx");
if ($freqflag){
print OUT "DICTIONARY 0 $C[$sfx]\n";
}
else{
print OUT "dictionary 0 $C[$sfx]\n";
}
$oldsfx=$sfx;
}
if ($freqflag){
print OUT "$w $F[$i]\n";
}
else{
print OUT "$w\n";
}
}
close (OUT) if $oldsfx!= -1;
my $numdict=$S{$D[$#D]}+1;
die "Only $numdict dictionaries were crested instead of $parts!" if ($numdict != $parts);
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