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Poster
On Iterative Hard Thresholding Methods for High-dimensional M-Estimation
Prateek Jain · Ambuj Tewari · Purushottam Kar

Mon Dec 08 04:00 PM -- 08:59 PM (PST) @ Level 2, room 210D #None

The use of M-estimators in generalized linear regression models in high dimensional settings requires risk minimization with hard L_0 constraints. Of the known methods, the class of projected gradient descent (also known as iterative hard thresholding (IHT)) methods is known to offer the fastest and most scalable solutions. However, the current state-of-the-art is only able to analyze these methods in extremely restrictive settings which do not hold in high dimensional statistical models. In this work we bridge this gap by providing the first analysis for IHT-style methods in the high dimensional statistical setting. Our bounds are tight and match known minimax lower bounds. Our results rely on a general analysis framework that enables us to analyze several popular hard thresholding style algorithms (such as HTP, CoSaMP, SP) in the high dimensional regression setting. Finally, we extend our analysis to the problem of low-rank matrix recovery.

Author Information

Prateek Jain (Microsoft Research)
Ambuj Tewari (University of Michigan)
Puru Kar (Indian Institute of Technology Kanpur)

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