Linearized Alternating Direction Method with Adaptive Penalty for Low-Rank Representation

By Zhouchen Lin, Risheng Liu, Zhixun Su. 2011

1,297 citations recorded by the source corpus.

Many machine learning and signal processing problems can be formulated as linearly constrained convex programs, which could be efficiently solved by the alternating direction method (ADM). However, usually the subproblems in ADM are easily solvable only when the linear mappings in the constraints are identities. To address this issue, we propose a linearized ADM (LADM) method by linearizing the quadratic penalty term and adding a proximal term when solving the sub-problems. For fast convergence, we also allow the penalty to change adaptively according a novel update rule. We prove the global convergence of LADM with adaptive penalty (LADMAP). As an example, we apply LADMAP to solve low-rank representation (LRR), which is an important subspace clustering technique yet suffers from high computation cost. By combining LADMAP with a skinny SVD representation technique, we are able to reduce the complexity O(n3) of the original ADM based method to O(rn2), where r and n are the rank and size of the representation matrix, respectively, hence making LRR possible for large scale applications. Numerical experiments verify that for LRR our LADMAP based methods are much faster than state-of-the-art algorithms.

Subfields: Aerospace Engineering, Computational Mechanics, Signal Processing

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In Aerospace Engineering

  1. Thierry Bouwmans
  2. Lei Zhang
  3. Dacheng Tao
  4. Haibin Ling
  5. Wangmeng Zuo
  6. Xiangchu Feng
  7. Deyu Meng
  8. Qi Xie

In Computational Mechanics

  1. Lei Zhang
  2. Wangmeng Zuo
  3. Xuelong Li
  4. Xiangchu Feng
  5. Thierry Bouwmans
  6. Deyu Meng
  7. Dacheng Tao
  8. Zhouchen Lin

In Signal Processing

  1. Thierry Bouwmans
  2. Dacheng Tao
  3. Lei Zhang
  4. Dong Xu
  5. Xiangchu Feng
  6. Xuelong Li
  7. Haibin Ling
  8. Deyu Meng

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