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arXiv 2102.10085cs.LGstat.ML
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极端支付条件下多臂强盗的输出加权抽样

Output-Weighted Sampling for Multi-Armed Bandits with Extreme Payoffs

University of Pennsylvania(宾夕法尼亚大学);Massachusetts Institute of Technology(麻省理工学院)

Yibo Yang, Antoine Blanchard, Themistoklis Sapsis, Paris Perdikaris

摘要:

我们提出了一种新的类型的收购功能,在线决策的多臂和上下文的强盗问题的极端收益。具体而言,我们将收益函数建模为高斯过程,并制定了一种新型的置信上限(UCB)获取函数,该函数根据观察到的奖励的变化性指导对被认为最相关的土匪的探索。这是通过计算一个易于处理的似然比来实现的,该似然比量化了输出相对于输入的重要性,并且本质上充当了促进对极端奖励的探索的\textit{attention mechanism}。我们展示了所提出的方法在几个合成基准的好处,以及一个现实的例子,涉及嘈杂的传感器网络数据。最后,我们提供了一个JAX库,用于使用高斯过程进行有效的bandit优化。

英文摘要:

We present a new type of acquisition functions for online decision making in multi-armed and contextual bandit problems with extreme payoffs. Specifically, we model the payoff function as a Gaussian process and formulate a novel type of upper confidence bound (UCB) acquisition function that guides exploration towards the bandits that are deemed most relevant according to the variability of the observed rewards. This is achieved by computing a tractable likelihood ratio that quantifies the importance of the output relative to the inputs and essentially acts as an \textit{attention mechanism} that promotes exploration of extreme rewards. We demonstrate the benefits of the proposed methodology across several synthetic benchmarks, as well as a realistic example involving noisy sensor network data. Finally, we provide a JAX library for efficient bandit optimization using Gaussian processes.

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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