Как вычислить (взвешенное) большинство по столбцам?

#!/usr/bin/perl

use List::MoreUtils qw(pairwise);
use List::Util qw(sum);
use strict;

sub read_file {
    my ($filename) = @_;
    open F, '<', $filename or die "Could not open $filename: $!";
    my %data;
    while (<F>) {
        my ($id, @data) = split;
        $data{$id} = \@data;
    }
    close F;
    return %data;
}

sub output_file {
    my ($filename, %data) = @_;
    open F, '>', $filename or die "Could not open $filename: $!";
    for (sort keys %data) {
        print F "$_\t$data{$_}\n";
    }
    close F;
}

my %votes = read_file 'votes.tsv';
my %weights = read_file 'weights.tsv';

my %unweighted;
while (my ($id, $data) = each(%votes)) {
    my $sum = List::Util::sum(@$data);
    $unweighted{$id} = $sum < 0 ? -1 :
                       $sum > 0 ? +1 : 0;
}
output_file('unweighted.tsv', %unweighted);

my %weighted;
while (my ($id, $data) = each(%weights)) {
    my $dot_prod = sum(pairwise { $a * $b } @{$votes{$id}}, @$data);
    $weighted{$id} = $dot_prod < 0 ? -1 :
                     $dot_prod > 0 ? +1 : 0;
}
output_file('weighted.tsv', %weighted);