带记忆对手的在线凸优化及其在统计套利中的应用
Online Convex Optimization Against Adversaries with Memory and Application to Statistical Arbitrage
摘要：
具有记忆的在线学习的框架自然地捕获具有时间约束的学习问题，并且先前针对专家设置进行了研究。在这项工作中，我们扩展的概念，学习与记忆的一般在线凸优化（OCO）的框架，并提出了两个算法，达到低遗憾。第一个算法适用于Lipschitz连续损失函数，获得凸和强凸损失的最优遗憾界。第二个算法达到最佳遗憾界，并适用于更广泛的凸损失，而不需要Lipschitz连续性，但更复杂的实现。我们补充我们的理论结果与金融统计套利的应用：我们设计算法构建均值回复投资组合。
英文摘要：
The framework of online learning with memory naturally captures learning problems with temporal constraints, and was previously studied for the experts setting. In this work we extend the notion of learning with memory to the general Online Convex Optimization (OCO) framework, and present two algorithms that attain low regret. The first algorithm applies to Lipschitz continuous loss functions, obtaining optimal regret bounds for both convex and strongly convex losses. The second algorithm attains the optimal regret bounds and applies more broadly to convex losses without requiring Lipschitz continuity, yet is more complicated to implement. We complement our theoretic results with an application to statistical arbitrage in finance: we devise algorithms for constructing mean-reverting portfolios.
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