Seminar: Sebastian Farquhar - University of Oxford

Date September 16, 2022
Author Hrvoje Stojic

Unbiased Active Learning and Testing

Abstract

Active learning is a powerful tool when labelling data is expensive, but it introduces a bias because the training data no longer follows the population distribution. We can, in fact, remove this bias using corrective weights based on importance sampling. This has two main consequences: first, we show that the bias is actually useful for active learning, especially with overparameterized models like neural networks; second, this technique enables active testing---a new way of doing model evaluation with limited data.

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