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arXiv 1704.04567stat.MLcs.LG
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基于经验方差引导的异步并行算法求解持票强盗问题

Asynchronous Parallel Empirical Variance Guided Algorithms for the Thresholding Bandit Problem

University of Rochester(罗切斯特大学)

Jie Zhong, Yijun Huang, Ji Liu

摘要:

本文考虑了Locatelli等人最近提出的多臂阈值强盗问题-通过尽可能少的拉动(或回合)来识别预期奖励高于预定义阈值的所有手臂。虽然Locatelli等人提出的算法。[2016]在一定意义上实现了最优轮复杂度,但仍然存在未解决的问题。本文提出了一种异步并行阈值算法及其无参数版本,以提高效率和适用性。一方面,这两种算法在每轮都使用经验方差来指导拉取决策,显著提高了“最优”算法在所有手臂高阶矩有界时的轮复杂度。所提出的算法可以被证明是最优的。另一方面,大多数强盗算法假设在拉取之后可以立即观察到奖励,或者在观察到所有奖励之前不会做出下一个决定。我们提出的异步并行算法允许选择下一个拉与未观察到的奖励从早期的拉,这避免了这样一个不切实际的假设,并显着提高了识别过程。我们的理论分析证明了所提出的异步并行算法的有效性和效率。

英文摘要:

This paper considers the multi-armed thresholding bandit problem -- identifying all arms whose expected rewards are above a predefined threshold via as few pulls (or rounds) as possible -- proposed by Locatelli et al. [2016] recently. Although the proposed algorithm in Locatelli et al. [2016] achieves the optimal round complexity in a certain sense, there still remain unsolved issues. This paper proposes an asynchronous parallel thresholding algorithm and its parameter-free version to improve the efficiency and the applicability. On one hand, the proposed two algorithms use the empirical variance to guide the pull decision at each round, and significantly improve the round complexity of the "optimal" algorithm when all arms have bounded high order moments. The proposed algorithms can be proven to be optimal. On the other hand, most bandit algorithms assume that the reward can be observed immediately after the pull or the next decision would not be made before all rewards are observed. Our proposed asynchronous parallel algorithms allow making the choice of the next pull with unobserved rewards from earlier pulls, which avoids such an unrealistic assumption and significantly improves the identification process. Our theoretical analysis justifies the effectiveness and the efficiency of proposed asynchronous parallel algorithms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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