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arxiv 2502.14379 v2 pith:QCMZBWV3 submitted 2025-02-20 cs.LG cs.DS

Achieving adaptivity and optimality for multi-armed bandits using Exponential-Kullback Leibler Maillard Sampling

classification cs.LG cs.DS
keywords optimalitycriteriaalgorithmsachieveasymptoticbanditsbeenbound
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We study the problem of $K$-armed bandits with reward distributions belonging to a one-parameter exponential distribution family. In the literature, several criteria have been proposed to evaluate the performance of such algorithms, including Asymptotic Optimality, Minimax Optimality, Sub-UCB, and variance-adaptive worst-case regret bound. Thompson Sampling-based and Upper Confidence Bound-based algorithms have been employed to achieve some of these criteria. However, none of these algorithms simultaneously satisfy all the aforementioned criteria. In this paper, we design an algorithm, Exponential Kullback-Leibler Maillard Sampling (abbrev. Exp-KL-MS), that can achieve multiple optimality criteria simultaneously, including Asymptotic Optimality, Minimax Optimality with a $\sqrt{\ln (K)}$ factor, Sub-UCB, and variance-adaptive worst-case regret bound.

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  1. Bandits for Efficient Experimentation: Adapting to Control Group, Preferences, and Context Drifts

    cs.LG 2026-06 unverdicted novelty 5.0

    Dri-MED achieves Õ(κ d² log T / Δ̃) regret and Õ(d) constraint violations for drifting contextual bandits with personalized preferences and baseline constraints under practitioner-friendly assumptions.