A Combinatorial Characterization of Supervised Online Learnability

7 Jul 2023  ·  Vinod Raman, Unique Subedi, Ambuj Tewari ·

We study the online learnability of hypothesis classes with respect to arbitrary, but bounded loss functions. No characterization of online learnability is known at this level of generality. We give a new scale-sensitive combinatorial dimension, named the sequential minimax dimension, and show that it gives a tight quantitative characterization of online learnability. In addition, we show that the sequential minimax dimension subsumes most existing combinatorial dimensions in online learning theory.

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