=13=    my $FUZZ = 5; # permitted average deviation in the vector elements
   
...   

=66=      BUCKET: for my $bucket (@buckets) {
=67=        my $error = 0;
=68=        INDEX: for my $index (0..$#vector) {
=69=          $error += abs($bucket->[0][$index] - $vector[$index]);
=70=          next BUCKET if $error > $FUZZ * @vector;
=71=        }
...

##</code><code>##

$pattern_sum += @pattern_vector;
$upper_bound  = $pattern_sum + $FUZZ * @pattern_vector;
$lower_bound  = $pattern_sum + $FUZZ * @pattern_vector;

BUCKET: for my $bucket (@buckets) {
   my $bucket_sum += @{$bucket->[0]};
   next BUCKET 
       if ($bucket_sum > $upper_bound || $bucket_sum < $lower_bound);
   # found, do something
}