contrast to learning as a dictionary lookup task where you're saying that okay hey I want to identify if two things are the same so I present one thing treated as a query and whatever I want to pair with is also present and a bunch of keys I have and there are also lots of other keys which could serve as negatives and I want to identify what is the right positive among these bunch of keys so you in Korea query you encode all your keys and you compute the pairwise similarities you know that true target which is because you know the