my $cmp1 = $embedding->comparator($embed1);
my $diff2 = $cmp1->($embed2);   # Compares $embed2 to $embed1
my $diff3 = $cmp1->($embed3);   # Compares $embed3 to $embed1
my $diff4 = $cmp1->($embed4);   # Compares $embed4 to $embed1
# ... etc ...