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Near-optimal Adaptive Pool-based Active Learning with General Loss
Proceedings of the 30th Conference on Uncertainty in Artificial Intelligence, PMLR R12:156-165, 2014.
Abstract
We consider adaptive pool-based active learning in a Bayesian setting. We first analyze two com- monly used greedy active learning criteria: the maximum entropy criterion, which selects the example with the highest entropy, and the least confidence criterion, which selects the example whose most probable label has the least probabil- ity value. We show that unlike the non-adaptive case, the maximum entropy criterion is not able to achieve an approximation that is within a con- stant factor of optimal policy entropy. For the least confidence criterion, we show that it is able to achieve a constant factor approximation to the optimal version space reduction in a worst-case setting, where the probability of labelings that have not been eliminated is considered as the ver- sion space. We consider a third greedy active learning criterion, the Gibbs error criterion, and generalize it to handle arbitrary loss functions be- tween labelings. We analyze the properties of the generalization and its variants, and show that they perform well in practice.