CRC Colloquium with Lothar Reichel

01.11.2024, 10:15 - 11:30  –  2.28.0.108
SFB-Kolloquium

Lothar Reichel, Kent State University, USA

A tensor bidiagonalization method for singular value decomposition of third order tensors

The need to know a few singular triplets associated with the largest singular values of a third-order tensor arises in data compression and extraction. This paper describes a new method for their computation using the t-product. Methods for deter mining a couple of singular triplets associated with the smallest singular values also are presented. The proposed methods generalize available restarted Lanczos bidiagonalization methods for computing a few of the largest or smallest singular triplets of a matrix. The methods of this paper use Ritz and harmonic Ritz lateral slices to determine accurate approximations of the largest and smallest singular triplets, respectively. Computed examples show applications to data compression and face recognition.