Regret to the Best vs. Regret to the Average
Description
We study regret minimization algorithms, focusing not only on their regret to the best
expert, but also on their regret to the average of all experts and to the worst expert. We show
that any algorithm that achieves only O(pT) regret to the best expert must, in the worst case,
suffer regret
(pT) to the average, and that for a wide class of update rules that includes
many existing no-regret algorithms (such as weighted majority, exponential weights, follow the
perturbed leader, and others), the product of the regret to the best and the regret to the average
is
(T). We describe and analyze a new algorithm, based on the exponential weights algorithm,
that achieves cumulative regret only O(pT log(T)) to the best expert and has a constant regret
to the average (with no dependence on either T or N). We also give a simple algorithm whose
payoff is always better (or equal) to the worst expert and has regret of O(pT) to the best expert.
| Slides | |
| 0:00 | Regret to the Best vs. Regret to the Average |
| 0:05 | The No-Regret Setting |
| 1:39 | This Work |
| 3:27 | Our Results |
| 5:31 | Oscillations: The Cost of an Update |
| 7:33 | A Bad Sequence |
| 8:42 | A Simple Trade-off: The ?(T) Barrier |
| 11:06 | Exponential Weights [F94] |
| 12:35 | So far… |
| 12:52 | An Unrestricted Lower Bound |
| 13:52 | A Simple Additive Algorithm |
| 15:01 | Breaking the ?(T) Barrier |
| 16:02 | Staying in the Loop |
| 18:03 | Exiting the Loop |
| 19:58 | Obliterating the ?(T) Barrier |
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