2 papers
math.NA2025
Dyadic Factorization and Efficient Inversion of Sparse Positive Definite Matrices
MichaŠKos, Krzysztof Podgórski, Hanqing Wu
In inverting large sparse matrices, the key difficulty lies in effectively exploiting sparsity during the inversion process. One well-established strategy is the nested dissection,…
math.ST2025
Unveiling low-dimensional patterns induced by convex non-differentiable regularizers
Ivan Hejný, Jonas Wallin, MaÅgorzata Bogdan +1
Popular regularizers with non-differentiable penalties, such as Lasso, Elastic Net, Generalized Lasso, or SLOPE, reduce the dimension of the parameter space by inducing sparsity or…