arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2409.05072cs.LGcs.ITmath.ITstat.ML
收藏

带博弈反馈的聚类与分布匹配通用框架

A General Framework for Clustering and Distribution Matching with Bandit Feedback

National University of Singapore(新加坡国立大学)

Recep Can Yavas, Yuqi Huang, Vincent Y. F. Tan, Jonathan Scarlett

AI总结:

针对带博弈反馈的聚类与分布匹配问题,提出通用框架,推导相关非渐近下界,开发基于Track-and-Stop和Frank--Wolfe的高效在线算法,其平均臂拉动次数渐近匹配下界且揭示收敛速度新界。

摘要:

我们针对带博弈反馈的聚类与分布匹配问题提出了一个通用框架。考虑一个K臂博弈模型,其中K个臂的某个子集被划分为M个组。在每个组内,与每个臂相关联的随机变量在有限字母表上遵循相同的分布。在每个时间步,决策者拉动一个臂并观察该臂相关随机变量的结果。后续的臂拉动取决于臂拉动历史及其结果。决策者不知道臂的分布或底层划分。任务是设计一种在线算法,以最少的平均臂拉动次数学习臂的底层划分,且错误概率不超过预先确定的值δ。多个现有问题属于我们的通用框架,包括寻找M对臂、异常臂识别以及K个臂的N元聚类。我们推导了任何错误概率不超过δ的在线算法的平均臂拉动次数的非渐近下界。此外,我们开发了一种基于Track-and-Stop方法和Frank--Wolfe算法的计算高效在线算法,并证明我们的算法的平均臂拉动次数渐近匹配下界。我们的精细分析还揭示了一个新的界,即当δ消失时,我们的算法的平均臂拉动次数收敛到基本极限的速度。

英文摘要:

We develop a general framework for clustering and distribution matching problems with bandit feedback. We consider a $K$-armed bandit model where some subset of $K$ arms is partitioned into $M$ groups. Within each group, the random variable associated to each arm follows the same distribution on a finite alphabet. At each time step, the decision maker pulls an arm and observes its outcome from the random variable associated to that arm. Subsequent arm pulls depend on the history of arm pulls and their outcomes. The decision maker has no knowledge of the distributions of the arms or the underlying partitions. The task is to devise an online algorithm to learn the underlying partition of arms with the least number of arm pulls on average and with an error probability not exceeding a pre-determined value~$δ$. Several existing problems fall under our general framework, including finding $M$ pairs of arms, odd arm identification, and $N$-ary clustering of $K$ arms belong to our general framework. We derive a non-asymptotic lower bound on the average number of arm pulls for any online algorithm with an error probability not exceeding $δ$. Furthermore, we develop a computationally-efficient online algorithm based on the Track-and-Stop method and Frank--Wolfe algorithm, and show that the average number of arm pulls of our algorithm asymptotically matches that of the lower bound. Our refined analysis also uncovers a novel bound on the speed at which the average number of arm pulls of our algorithm converges to the fundamental limit as $δ$ vanishes.

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。

↑