2 papers
math.OC2025
Rescaling and unconstrained minimisation of convex quadratic maps
Alexandra Zverovich, Matthew Hutchings, Bertrand Gauthier
We investigate the properties of a class of piecewise-fractional maps arising from the introduction of an invariance under rescaling into convex quadratic maps. The subsequent maps…
stat.ML2022
Local optimisation of Nyström samples through stochastic gradient descent
Matthew Hutchings, Bertrand Gauthier
We study a relaxed version of the column-sampling problem for the Nyström approximation of kernel matrices, where approximations are defined from multisets of landmark points in th…