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Prototypical Networks for Few-shot Learning

Prototypical Networks for Few-shot LearningJake SnellUniversity of Toronto Vector InstituteKevin SwerskyTwitterRichard ZemelUniversity of TorontoVector InstituteCanadian Institute for Advanced ResearchAbstractWe proposePrototypical Networksfor the problem of Few-shot classification, wherea classifier must generalize to new classes not seen in the training set, given onlya small number of examples of each new class. Prototypical Networks learn ametric space in which classification can be performed by computing distancesto prototype representations of each class. Compared to recent approaches forfew-shot Learning , they reflect a simpler inductive bias that is beneficial in thislimited-data regime, and achieve excellent results.

˚: RD!RMwith learnable parameters ˚. Each prototype is the mean vector of the embedded support points belonging to its class: c k= 1 jS kj X (x i;y i)2S k f ˚(x i) (1) Given a distance function d: R M R ![0;+1), Prototypical Networks produce a distribution over classes for a query point x based on a softmax over distances to the prototypes ...

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