Adaptation to the Range in $K$-Armed Bandits

We consider stochastic bandit problems with $K$ arms, each associated with a bounded distribution supported on the range $[m,M]$. We do not assume that the range $[m,M]$ is known and show that there is a cost for learning this range. Indeed, a new trade-off between distribution-dependent and distribution-free regret bounds arises, which prevents from simultaneously achieving the typical $ln T$ and smash{$sqrt{T}$} bounds. For instance, a smash{$sqrt{T}$} distribution-free regret bound may only be achieved if the distribution-dependent regret bounds are at least of order smash{$sqrt{T}$}. We exhibit a strategy achieving the rates for regret indicated by the new trade-off.