# Zev Woodstock

I research nonsmooth optimization, splitting algorithms, machine learning, and monotone operator theory. My collaborators and I develop these tools to solve nonlinear problems in data science, signal/image/audio processing, and large-scale optimization.

## đź“¬ Contact

- office
- Room 3107 at ZIB
- woodstock (at) zib.de
- homepage
- zevwoodstock.github.io

## đźŽ“ Curriculum vitae

- 2022 to 2024
- Researcher at ZIB
- May 2021
- Ph.D. in Mathematics at NC State
- Jan 2018
- M.Sc. in Applied Mathematics at NC State
- May 2016
- B.Sc. in Mathematics at JMU

## đź“ť Publications and preprints

### Preprints

- Woodstock, Z., and Pokutta, S. (2023).
*Splitting the Conditional Gradient Algorithm*. [arXiv]## [BibTeX]

### Conference proceedings

- BĂşi, M. N., Combettes, P. L., and Woodstock, Z. (2022). Block-activated Algorithms for Multicomponent Fully Nonsmooth Minimization.
*Proceedings of ICASSP 2022 - 2022 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)*, 5428â€“5432. DOI: 10.1109/ICASSP43922.2022.9747479 [URL]## [BibTeX]

- Combettes, P. L., and Woodstock, Z. (2022). Signal Recovery From Inconsistent Nonlinear Observations.
*Proceedings of ICASSP 2022 - 2022 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)*, 5872â€“5876. DOI: 10.1109/ICASSP43922.2022.9746145## [BibTeX]

- Combettes, P. L., and Woodstock, Z. (2021). A Fixed Point Framework for Recovering Signals From Nonlinear Transformations.
*Proceedings of 2020 28th European Signal Processing Conference (EUSIPCO)*, 2120â€“2124. DOI: 10.23919/Eusipco47968.2020.9287736## [BibTeX]

- Lubert, C. P., Romero, J. N., Sochacki, J. S., and Woodstock, Z. (2016). Rocket Launch Noise and the Coanda Effect.
*Proceedings of American Institute of Aeronautics and Astronautics (AIAA) SPACE 2016*, 5626. DOI: 10.2514/6.2016-5625 [URL]## [BibTeX]

### Full articles

- Kreimeier, T., Pokutta, S., Walther, A., and Woodstock, Z. (2023). On a Frank-Wolfe Approach for Abs-smooth Functions.
*Optimization Methods and Software*. [arXiv]## [BibTeX]

- Combettes, P. L., and Woodstock, Z. (2022). A Variational Inequality Model for the Construction of Signals From Inconsistent Nonlinear Equations.
*SIAM Journal on Imaging Sciences*,*15*(1), 84â€“109. DOI: 10.1137/21M1420368## [BibTeX]

- Combettes, P. L., and Woodstock, Z. (2021). Reconstruction of Functions From Prescribed Proximal Points.
*Journal of Approximation Theory*,*268*(105606). DOI: 10.1016/j.jat.2021.105606## [BibTeX]

- Lienkaemper, C., Shiu, A., and Woodstock, Z. (2017). Obstructions to Convexity in Neural Codes.
*Advances in Applied Mathematics*,*85*, 31â€“59. DOI: 10.1016/j.aam.2016.11.006## [BibTeX]

- FĂ©lix, B., Shiu, A., and Woodstock, Z. (2016). Analyzing Multistationarity in Chemical Reaction Networks Using the Determinant Optimization Method.
*Applied Mathematics and Computation*,*287â€“288*, 60â€“73. DOI: 10.1016/j.amc.2016.04.030## [BibTeX]

- Lubert, C. P., and Woodstock, Z. (2014). Architectural Acoustical Oddities.
*The Journal of the Acoustical Society of America*,*136*(2126). DOI: 10.1121/1.4899659## [BibTeX]

## đź”¬ Projects

On a Frank-Wolfe Approach for Abs-smooth Optimization

Motivated by nonsmooth problems in machine learning, we solve the problem of minimizing an abs-smooth function subject to closed convex constraints. New theory and algorithms are developed using linear minimization oracles to enforce constraints and abs-linearization methods to handle nonsmoothness.

MATH+ EF1-23

Apr 2023 to Mar 2026

4

2

## đź’¬ Talks and posters

### Conference and workshop talks

- Oct 2023
*Splitting the Conditional Gradient Algorithm*

INFORMS Conference, Phoenix [PDF]