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Poster
Polar Operators for Structured Sparse Estimation
Xinhua Zhang · Yao-Liang Yu · Dale Schuurmans
Thu Dec 05 07:00 PM -- 11:59 PM (PST) @ Harrah's Special Events Center, 2nd Floor
Structured sparse estimation has become an important technique in many areas of data analysis. Unfortunately, these estimators normally create computational difficulties that entail sophisticated algorithms. Our first contribution is to uncover a rich class of structured sparse regularizers whose polar operator can be evaluated efficiently. With such an operator, a simple conditional gradient method can then be developed that, when combined with smoothing and local optimization, significantly reduces training time vs. the state of the art. We also demonstrate a new reduction of polar to proximal maps that enables more efficient latent fused lasso.
Author Information
Xinhua Zhang (University of Illinois at Chicago (UIC))
Yao-Liang Yu (University of Waterloo)
Dale Schuurmans (Google Brain & University of Alberta)
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