COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Krylov Subspace Methods for Sparse Reconstruction

## Krylov Subspace Methods for Sparse ReconstructionAdd to your list(s) Download to your calendar using vCal - Silvia Gazzola (University of Bath)
- Thursday 02 November 2017, 09:00-09:50
- Seminar Room 1, Newton Institute.
If you have a question about this talk, please contact info@newton.ac.uk. VMVW02 - Generative models, parameter learning and sparsity Krylov subspace methods are popular numerical linear algebra tools that can be successfully employed to regularize linear large-scale inverse problems, such as those arising in image deblurring and computed tomography. Though they are commonly used as purely iterative regularization methods (where the number of iterations acts as a regularization parameter), they can be also employed in a hybrid fashion, i.e., to solve Tikhonov regularized problems (where both the number of iterations and and the Tikhonov parameter play the role of regularizations parameters, which can be chosen adaptively). Krylov subspace methods can naturally handle unconstrained penalized least squares problems. The goal of this talk is to present a common framework that exploits a flexible version of well-known Krylov methods such as CGLS and GMRES to handle nonnegativity constraints and regularization terms expressed with respect to the 1-norm, resulting in an efficient way to enforce sparse reconstructions of the solution. Numerical experiments and comparisons with other well-known methods for the computation of nonnegative and sparse solutions will be presented. These results have been obtained working jointly with James Nagy (Emory University), Paolo Novati (University of Trieste), Yves Wiaux (Heriot-Watt University), and Julianne Chung (Virginia Polytechnic Institute and State University). This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
- Featured lists
- INI info aggregator
- Isaac Newton Institute Seminar Series
- School of Physical Sciences
- Seminar Room 1, Newton Institute
Note that ex-directory lists are not shown. |
## Other listsThe obesity epidemic: Discussing the global health crisis Arctic Ocean Geopolitics Programme Techfugees Cambridge## Other talksCycles of Revolution in Ukraine Building cortical networks: from molecules to function Private Statistics and Their Applications to Distributed Learning: Tools and Challenges The Fyodorov-Bouchaud conjecture and Liouville conformal field theory Characterizing Immunogenetic Mechanisms through HIV Disease Analysis How T-cells cause autoimmune disease and hold the key to curing cancer |