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关注这篇论文的作者
Jianqing Fan
Han Liu
Qiang Sun
Tong Zhang

稀疏学习的 I-LAMM:同时控制算法复杂度与统计误差

研究问题
拟合带非凸惩罚的高维模型时,如何安排优化精度和迭代过程,同时控制计算复杂度与统计误差并获得理论保证?
方法与思路
作者提出两阶段 I-LAMM:先以较粗容差求解凸问题得到初值,再以更小容差迭代求解凸问题,实施折叠凹惩罚的局部线性逼近。
材料陈述的贡献
摘要称,算法由第一阶段的次线性迭代复杂度转为第二阶段的线性收敛,并以收缩性质说明迭代如何影响统计误差。
阅读关注点
应核对局部稀疏或受限特征值条件、容差与停止规则、最小信号要求,以及所称最优统计表现与复杂度的具体定义。
阅读边界
所据为 arXiv 预印本,同行评审及期刊接收未核实;摘要未列出完整假设,较弱条件及最优性主张须结合全文比较范围判断。

原文摘要

We propose a computational framework named iterative local adaptive majorize-minimization (I-LAMM) to simultaneously control algorithmic complexity and statistical error when fitting high dimensional models. I-LAMM is a two-stage algorithmic implementation of the local linear approximation to a family of folded concave penalized quasi-likelihood. The first stage solves a convex program with a crude precision tolerance to obtain a coarse initial estimator, which is further refined in the second stage by iteratively solving a sequence of convex programs with smaller precision tolerances. Theoretically, we establish a phase transition: the first stage has a sublinear iteration complexity, while the second stage achieves an improved linear rate of convergence. Though this framework is completely algorithmic, it provides solutions with optimal statistical performances and controlled algorithmic complexity for a large family of nonconvex optimization problems. The iteration effects on statistical errors are clearly demonstrated via a contraction property. Our theory relies on a localized version of the sparse/restricted eigenvalue condition, which allows us to analyze a large family of loss and penalty functions and provide optimality guarantees under very weak assumptions (For example, I-LAMM requires much weaker minimal signal strength than other procedures). Thorough numerical results are provided to support the obtained theory.

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