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arXiv 2202.00628cs.LGcs.GTstat.ML
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基于表演性反馈的后悔最小化

Regret Minimization with Performative Feedback

University of California, Berkeley(加州大学伯克利分校);Max Planck Institute for Intelligent Systems(马克斯·普朗克智能系统研究所)

Meena Jagadeesan, Tijana Zrnic, Celestine Mendler-Dünner

摘要:

在执行性预测中,预测模型的部署会触发数据分布的转变。由于这些变化通常是事先未知的,学习者需要部署一个模型来获得关于它所诱导的分布的反馈。我们研究的问题,找到接近最优的模型下performativity,同时保持低遗憾。从表面上看,这个问题似乎相当于一个强盗问题。然而,它展示了一个从根本上更丰富的反馈结构,我们称之为表演反馈:在每次部署之后,学习者从移动的分布中接收样本,而不仅仅是关于奖励的强盗反馈。我们的主要贡献是一个算法,实现遗憾界缩放仅与复杂的分布偏移,而不是奖励函数。该算法仅依赖于位移的光滑性,而不假设凸性。此外,它的最终结果保证接近最优。关键的算法思想是仔细探索的分布偏移,通知一个新的建设的置信界限的风险未探索的模型。更广泛地说,我们的工作建立了一个概念性的方法,利用工具的土匪文学的目的,后悔最小化与表演反馈。

英文摘要:

In performative prediction, the deployment of a predictive model triggers a shift in the data distribution. As these shifts are typically unknown ahead of time, the learner needs to deploy a model to get feedback about the distribution it induces. We study the problem of finding near-optimal models under performativity while maintaining low regret. On the surface, this problem might seem equivalent to a bandit problem. However, it exhibits a fundamentally richer feedback structure that we refer to as performative feedback: after every deployment, the learner receives samples from the shifted distribution rather than only bandit feedback about the reward. Our main contribution is an algorithm that achieves regret bounds scaling only with the complexity of the distribution shifts and not that of the reward function. The algorithm only relies on smoothness of the shifts and does not assume convexity. Moreover, its final iterate is guaranteed to be near-optimal. The key algorithmic idea is careful exploration of the distribution shifts that informs a novel construction of confidence bounds on the risk of unexplored models. More broadly, our work establishes a conceptual approach for leveraging tools from the bandits literature for the purpose of regret minimization with performative feedback.

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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