16,932 research outputs found
Global Gevrey hypoellipticity for the twisted Laplacian on forms
We study in this paper the global hypoellipticity property in the Gevrey
category for the generalized twisted Laplacian on forms. Different from the
0-form case, where the twisted Laplacian is a scalar operator, this is a system
of differential operators when acting on forms, each component operator being
elliptic locally and degenerate globally. We obtain here the global
hypoellipticity in anisotropic Gevrey space
Proximal Iteratively Reweighted Algorithm with Multiple Splitting for Nonconvex Sparsity Optimization
This paper proposes the Proximal Iteratively REweighted (PIRE) algorithm for
solving a general problem, which involves a large body of nonconvex sparse and
structured sparse related problems. Comparing with previous iterative solvers
for nonconvex sparse problem, PIRE is much more general and efficient. The
computational cost of PIRE in each iteration is usually as low as the
state-of-the-art convex solvers. We further propose the PIRE algorithm with
Parallel Splitting (PIRE-PS) and PIRE algorithm with Alternative Updating
(PIRE-AU) to handle the multi-variable problems. In theory, we prove that our
proposed methods converge and any limit solution is a stationary point.
Extensive experiments on both synthesis and real data sets demonstrate that our
methods achieve comparative learning performance, but are much more efficient,
by comparing with previous nonconvex solvers
- …