针对预测设计最优算法,提升在线决策性能
Prediction-Specific Design of Learning-Augmented Algorithms
- 基于预测特定性设计强最优算法,优化鲁棒性与一致性权衡
- 在滑雪租赁、一最大搜索等经典问题上实现显著性能提升
- 适用于需要高精度预测的在线决策场景,如电力管理与交易
学习增强型算法已成为融合传统在线算法鲁棒性与机器学习预测性能优势的重要框架。然而,现有方法普遍过于保守,未能利用问题结构实现预测特定的性能优化。本文提出‘强最优’算法新概念,不仅在最坏情况下的鲁棒性与一致性间达到帕累托最优,更在预测特定的权衡中实现最优。我们构建了一个通用的双层优化框架,可系统化设计多种问题下的强最优算法,并为确定性和随机滑雪租赁、一最大搜索等经典在线问题提出了具体算法。分析揭示了预测如何通过预测特定设计被最优融入在线算法的新结构洞见。在动态电源管理与基于波动率的指数交易等案例研究中,实验证明该框架能显著提升多种在线决策场景的性能。
原文摘要 · Abstract (English)
Algorithms with predictions} has emerged as a powerful framework to combine the robustness of traditional online algorithms with the data-driven performance benefits of machine-learned (ML) predictions. However, most existing approaches in this paradigm are overly conservative, {as they do not leverage problem structure to optimize performance in a prediction-specific manner}. In this paper, we show that such prediction-specific performance criteria can enable significant performance improvements over the coarser notions of consistency and robustness considered in prior work. Specifically, we propose a notion of \emph{strongly-optimal} algorithms with predictions, which obtain Pareto optimality not just in the worst-case tradeoff between robustness and consistency, but also in the prediction-specific tradeoff between these metrics. We develop a general bi-level optimization framework that enables systematically designing strongly-optimal algorithms in a wide variety of problem settings, and we propose explicit strongly-optimal algorithms for several classic online problems: deterministic and randomized ski rental, and one-max search. Our analysis reveals new structural insights into how predictions can be optimally integrated into online algorithms by leveraging a prediction-specific design. To validate the benefits of our proposed framework, we empirically evaluate our algorithms in case studies on problems including dynamic power management and volatility-based index trading. Our results demonstrate that prediction-specific, strongly-optimal algorithms can significantly improve performance across a variety of online decision-making settings.
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