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Open Problem: Is There an Online Learning Algorithm That Learns Whenever Online Learning Is Possible?
Steve Hanneke · 2021-07-20 · via math.PR updates on arXiv.org

This open problem asks whether there exists an online learning algorithm for binary classification that guarantees, for all target concepts, to make a sublinear number of mistakes, under only the assumption that the (possibly random) sequence of points X allows that such a learning algorithm can exist for that sequence. As a secondary problem, it also asks whether a specific concise condition completely determines whether a given (possibly random) sequence of points X admits the existence of online learning algorithms guaranteeing a sublinear number of mistakes for all target concepts.

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