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分类依据与纠错

AI 根据所提供的论文材料归类:摘要以处理分配、增广逆概率加权和个性化政策学习为核心。

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正在核对关联版本…

代码、数据与补充材料

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关注这篇论文的作者
Ruohan Zhan
Zhimei Ren
Susan Athey
Zhengyuan Zhou

利用自适应收集数据进行政策学习

研究问题
当处理分配随历史数据自适应变化,导致样本依赖和不同人群探索不足时,如何事后学习最优个性化政策并控制学习遗憾?
方法与思路
作者基于广义增广逆概率加权估计量,对其组成项进行非均匀重加权以控制最坏情形估计方差,并建立遗憾的上下界。
材料陈述的贡献
摘要称,采用最佳权重方案时,即使探索逐渐减弱,算法仍可达到极小极大最优遗憾率;合成与公开基准数据用于展示表现。
阅读关注点
应核对自适应分配概率、探索衰减和政策类的条件,以及最佳权重的可实现性、有限样本遗憾界与下界的匹配范围。
阅读边界
这是 arXiv 预印本,同行评审与期刊接收未核实;摘要未给出权重公式、探索条件和数值结果,不能将最优率保证视为无条件成立。

原文摘要

Learning optimal policies from historical data enables personalization in a wide variety of applications including healthcare, digital recommendations, and online education. The growing policy learning literature focuses on settings where the data collection rule stays fixed throughout the experiment. However, adaptive data collection is becoming more common in practice, from two primary sources: 1) data collected from adaptive experiments that are designed to improve inferential efficiency; 2) data collected from production systems that progressively evolve an operational policy to improve performance over time (e.g. contextual bandits). Yet adaptivity complicates the optimal policy identification ex post, since samples are dependent, and each treatment may not receive enough observations for each type of individual. In this paper, we make initial research inquiries into addressing the challenges of learning the optimal policy with adaptively collected data. We propose an algorithm based on generalized augmented inverse propensity weighted (AIPW) estimators, which non-uniformly reweight the elements of a standard AIPW estimator to control worst-case estimation variance. We establish a finite-sample regret upper bound for our algorithm and complement it with a regret lower bound that quantifies the fundamental difficulty of policy learning with adaptive data. When equipped with the best weighting scheme, our algorithm achieves minimax rate optimal regret guarantees even with diminishing exploration. Finally, we demonstrate our algorithm's effectiveness using both synthetic data and public benchmark datasets.

笔记与分组
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