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Adaptivity to Noise Parameters in Nonparametric Active Learning

Abstract · Mar 16, 2017 22:37 ·

stat-ml

Arxiv Abstract

  • Andrea Locatelli
  • Alexandra Carpentier
  • Samory Kpotufe

This work addresses various open questions in the theory of active learning for nonparametric classification. Our contributions are both statistical and algorithmic: -We establish new minimax-rates for active learning under common \textit{noise conditions}. These rates display interesting transitions – due to the interaction between noise \textit{smoothness and margin} – not present in the passive setting. Some such transitions were previously conjectured, but remained unconfirmed. -We present a generic algorithmic strategy for adaptivity to unknown noise smoothness and margin; our strategy achieves optimal rates in many general situations; furthermore, unlike in previous work, we avoid the need for \textit{adaptive confidence sets}, resulting in strictly milder distributional requirements.

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