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arXiv 2009.02791cs.LGeess.SP
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一种基于变化检测的非平稳Bandits Thompson采样框架

A Change-Detection Based Thompson Sampling Framework for Non-Stationary Bandits

IIIT Delhi(印度德里信息技术学院)

Gourab Ghatak

摘要:

我们考虑一个非平稳的双臂强盗框架,并提出了一个变化检测的汤普森采样(TS)算法,命名为TS与变化检测(TS-CD),以保持跟踪的动态环境。使用泊松到达过程来建模非平稳性,该过程在每次到达时改变奖励的平均值。建议的策略比较的经验平均值最近的回报的一个手臂的平均回报的估计,从其历史。当经验均值偏离均值估计值的值大于阈值时,它会检测到变化。然后,我们表征的时间窗口的持续时间的下限,其中的强盗框架必须保持静止的TS-CD成功地检测到变化时,它发生。因此,我们的研究结果突出了泊松到达过程的参数上界,TS-CD以高概率实现渐近遗憾最优。最后,我们通过测试它的无线接入技术(RAT)的边缘控制,在无线网络中的选择验证TS-CD的功效。我们的研究结果表明,TS-CD不仅优于经典的最大功率RAT选择策略,而且其他主动自适应和被动自适应的强盗算法,设计用于非平稳环境。

英文摘要:

We consider a non-stationary two-armed bandit framework and propose a change-detection based Thompson sampling (TS) algorithm, named TS with change-detection (TS-CD), to keep track of the dynamic environment. The non-stationarity is modeled using a Poisson arrival process, which changes the mean of the rewards on each arrival. The proposed strategy compares the empirical mean of the recent rewards of an arm with the estimate of the mean of the rewards from its history. It detects a change when the empirical mean deviates from the mean estimate by a value larger than a threshold. Then, we characterize the lower bound on the duration of the time-window for which the bandit framework must remain stationary for TS-CD to successfully detect a change when it occurs. Consequently, our results highlight an upper bound on the parameter for the Poisson arrival process, for which the TS-CD achieves asymptotic regret optimality with high probability. Finally, we validate the efficacy of TS-CD by testing it for edge-control of radio access technique (RAT)-selection in a wireless network. Our results show that TS-CD not only outperforms the classical max-power RAT selection strategy but also other actively adaptive and passively adaptive bandit algorithms that are designed for non-stationary environments.

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