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stat.ML updates on arXiv.org

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Improved Algorithms for Efficient Active Learning Halfspa...
Chicheng Zhang, Yinan Li · 2021-02-10 · via stat.ML updates on arXiv.org

We give a computationally-efficient PAC active learning algorithm for $d$-dimensional homogeneous halfspaces that can tolerate Massart noise (Massart and Nédélec, 2006) and Tsybakov noise (Tsybakov, 2004). Specialized to the $η$-Massart noise setting, our algorithm achieves an information-theoretically near-optimal label complexity of $\tilde{O}\left( \frac{d}{(1-2η)^2} \mathrm{polylog}(\frac1ε) \right)$ under a wide range of unlabeled data distributions (specifically, the family of "structured distributions" defined in Diakonikolas et al. (2020)). Under the more challenging Tsybakov noise condition, we identify two subfamilies of noise conditions, under which our efficient algorithm provides label complexity guarantees strictly lower than passive learning algorithms.