Faster Convex Lipschitz Regression via 2-block ADMM
Faster Convex Lipschitz Regression via 2-block ADMM
复制标题
通过 2 块 ADMM 实现更快的凸 Lipschitz 回归
DOI:
--
复制
发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Brian Kulis
中科院分区:
文献类型:
--
作者:
Ali Siahkamari;D. A. E. Acar;Christopher Liao;Kelly Geyer;Venkatesh Saligrama;Brian Kulis
The task of approximating an arbitrary convex function arises in several learning problems such as convex regression, learning with a difference of convex (DC) functions, and approximating Bregman divergences. In this paper, we show how a broad class of convex function learning problems can be solved via a 2-block ADMM approach, where updates for each block can be computed in closed form. For the task of convex Lipschitz regression, we establish that our proposed al-gorithm converges with iteration complexity of O ( n √ d/(cid:15) ) for a dataset X ∈ R n × d and (cid:15) > 0. Combined with per-iteration computation complexity, our method converges with the rate O ( n 3 d 1 . 5 /(cid:15) + n 2 d 2 . 5 /(cid:15) + nd 3 /(cid:15) ). This new rate improves the state of the art rate of O ( n 5 d 2 /(cid:15) ) available by interior point methods if d = o ( n 4 ). Further we provide similar solvers for DC regression and Breg-man divergence learning. Unlike previous approaches, our method is amenable to the use of GPUs. We demonstrate on regression and metric learning experiments that our approach is up to 30 times faster than the existing method, and produces results that are comparable to state-of-the-art.
DOI:
10.1137/18m117337x
发表时间:
2018-03
期刊:
SIAM J. Optim.
影响因子:
--
作者:
Ying Cui;J. Pang;B. Sen
通讯作者:
Ying Cui;J. Pang;B. Sen