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arXiv 2102.10773cs.LGmath.OCstat.COstat.ML
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稀疏条件下的缓变回归

Slowly Varying Regression under Sparsity

Sloan School of Management, Massachusetts Institute of Technology(麻省理工学院斯隆管理学院);HEC Paris(巴黎高等商学院);Operations Research Center, Massachusetts Institute of Technology(麻省理工学院运筹学中心);Technology and Operations Management Unit, Harvard Business School(哈佛商学院技术与运营管理系);McKinsey & Company(麦肯锡公司)

Dimitris Bertsimas, Vassilis Digalakis, Michael Linghzi Li, Omar Skali Lami

AI总结:

本文提出稀疏缓变回归框架,将参数估计转化为可精确松弛为二元凸优化的混合整数问题,并开发高效算法与启发式方法,实验证明其在精度、预测和时间上优于现有方法,且可扩展至数千参数。

摘要:

我们提出了稀疏条件下缓变回归的框架,允许稀疏回归模型表现出缓慢且稀疏的变化。参数估计问题被表述为一个混合整数优化问题。我们证明,通过一种新颖的松弛技术,它可以被精确地重新表述为一个二元凸优化问题。这种松弛涉及到一个关于Moore-Penrose逆的新等式,将非凸目标函数凸化,同时在所有可行的二元点上与原目标函数匹配。这使得我们能够使用割平面类算法高效地将问题求解到可证明的最优性。我们开发了该算法的高度优化实现,显著提高了直接实现的渐近计算复杂度。此外,我们提出了一种快速启发式方法,保证可行解,并且如经验所示,为二元优化问题产生高质量的热启动解。为了调整框架的超参数,我们建议一种依赖于二分搜索的实用程序,该程序在某些假设下保证恢复真实的模型参数。在合成和真实世界数据集上,我们证明了所得算法在相当的时间内,在各种指标上(包括估计精度、预测能力和计算时间)优于竞争性公式。该算法高度可扩展,允许我们训练具有数千个参数的模型。我们的实现开源,可在https://github.com/vvdigalakis/SSVRegression.git获取。

英文摘要:

We present the framework of slowly varying regression under sparsity, allowing sparse regression models to exhibit slow and sparse variations. The problem of parameter estimation is formulated as a mixed-integer optimization problem. We demonstrate that it can be precisely reformulated as a binary convex optimization problem through a novel relaxation technique. This relaxation involves a new equality on Moore-Penrose inverses, convexifying the non-convex objective function while matching the original objective on all feasible binary points. This enables us to efficiently solve the problem to provable optimality using a cutting plane-type algorithm. We develop a highly optimized implementation of this algorithm, substantially improving upon the asymptotic computational complexity of a straightforward implementation. Additionally, we propose a fast heuristic method that guarantees a feasible solution and, as empirically illustrated, produces high-quality warm-start solutions for the binary optimization problem. To tune the framework's hyperparameters, we suggest a practical procedure relying on binary search that, under certain assumptions, is guaranteed to recover the true model parameters. On both synthetic and real-world datasets, we demonstrate that the resulting algorithm outperforms competing formulations in comparable times across various metrics, including estimation accuracy, predictive power, and computational time. The algorithm is highly scalable, allowing us to train models with thousands of parameters. Our implementation is available open-source at https://github.com/vvdigalakis/SSVRegression.git.

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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