Dimension-Free Exponentiated Gradient

We present a new online learning algorithm that extends the exponentiated gradient to infinite dimensional spaces. Our analysis shows that the algorithm is implicitly able to estimate the $L_2$ norm of the unknown competitor, $U$, achieving a regret bound of the order of $O(U \log (U T+1))\sqrt{T})$, instead of the standard $O((U^2 +1) \sqrt{T})$, achievable without knowing $U$... (read more)

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