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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 ...

my $cmp2 = $embedding->comparator($embed2);
# classify target embeddings according to which they are most similar 
+to
for my $next_embed (@targets) {
...
    push @closer_to_embed2, $next_embed;
  }
}