giza2bal.pl.svn-base

解码器是基于短语的统计机器翻译系统的核心模块

#! /usr/bin/perl

#Converts direct and inverted alignments into a more compact 
#bi-alignment format. It optionally reads the counting file 
#produced by giza containing the frequency of each traning sentence.

#Copyright Marcello Federico, November 2004

($cnt,$dir,$inv)=();

while ($w=shift @ARGV){
  $dir=shift(@ARGV),next  if $w eq "-d";
  $inv=shift(@ARGV),next  if $w eq "-i";
  $cnt=shift(@ARGV),next  if $w eq "-c";
} 

if (!$dir || !inv){
 print  "usage: giza2bal.pl [-c <count-file>] -d <dir-align-file> -i <inv-align-file>\n"; 
 print  "input files can be also commands, e.g. -d \"gunzip -c file.gz\"\n";
 exit(0);
}

$|=1;

open(DIR,"<$dir") || open(DIR,"$dir|") || die "cannot open $dir\n";
open(INV,"<$inv") || open(INV,"$inv|") || die "cannot open $dir\n";

if ($cnt){
open(CNT,"<$cnt") || open(CNT,"$cnt|") || die "cannot open $dir\n";
}


sub ReadBiAlign{
    local($fd0,$fd1,$fd2,*s1,*s2,*a,*b,*c)=@_;
    local($dummy,$n);

    chop($c=<$fd0>); ## count
    $dummy=<$fd0>; ## header
    $dummy=<$fd0>; ## header
    $c=1 if !$c;

    $dummy=<$fd1>; ## header
    chop($s1=<$fd1>);
    chop($t1=<$fd1>);

    $dummy=<$fd2>; ## header
    chop($s2=<$fd2>);
    chop($t2=<$fd2>);

    @a=@b=();

    #get target statistics
    $n=1;
    $t1=~s/NULL \(\{(( \d+)*) \}\)//;
    while ($t1=~s/(\S+) \(\{(( \d+)*) \}\)//){
        grep($a[$_]=$n,split(/ /,$2));
        $n++;
    }

    $m=1;
    $t2=~s/NULL \(\{(( \d+)*) \}\)//;
    while ($t2=~s/(\S+) \(\{(( \d+)*) \}\)//){
        grep($b[$_]=$m,split(/ /,$2));
        $m++;
    }

    $M=split(/ /,$s1);
    $N=split(/ /,$s2);

    return 0 if $m != ($M+1) || $n != ($N+1);

    for ($j=1;$j<$m;$j++){
        $a[$j]=0 if !$a[$j];
    }

    for ($i=1;$i<$n;$i++){
        $b[$i]=0 if !$b[$i];
    }


    return 1;
}

$skip=0;
$ccc=0;
while(!eof(DIR)){

    if (ReadBiAlign(CNT,DIR,INV,*src,*tgt,*a,*b,*c))
    {
	$ccc++;
        print "$c\n";
        print $#a," $src \# @a[1..$#a]\n";
        print $#b," $tgt \# @b[1..$#b]\n";
    }
    else{
        print STDERR "." if !(++$skip % 1000);
    }
};
print STDERR "skip=<$skip> counts=<$ccc>\n";