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Bayesian Meta-Learning for the Few-Shot Setting via Deep Kernels

Massimiliano Patacchiola, Jack Turner, Elliot Crowley, Michael O'Boyle, Amos Storkey

Spotlight presentation: Orals & Spotlights Track 16: Continual/Meta/Misc Learning
on Wed, Dec 9th, 2020 @ 15:20 – 15:30 GMT
Poster Session 4 (more posters)
on Wed, Dec 9th, 2020 @ 17:00 – 19:00 GMT
Abstract: Recently, different machine learning methods have been introduced to tackle the challenging few-shot learning scenario that is, learning from a small labeled dataset related to a specific task. Common approaches have taken the form of meta-learning: learning to learn on the new problem given the old. Following the recognition that meta-learning is implementing learning in a multi-level model, we present a Bayesian treatment for the meta-learning inner loop through the use of deep kernels. As a result we can learn a kernel that transfers to new tasks; we call this Deep Kernel Transfer (DKT). This approach has many advantages: is straightforward to implement as a single optimizer, provides uncertainty quantification, and does not require estimation of task-specific parameters. We empirically demonstrate that DKT outperforms several state-of-the-art algorithms in few-shot classification, and is the state of the art for cross-domain adaptation and regression. We conclude that complex meta-learning routines can be replaced by a simpler Bayesian model without loss of accuracy.

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