title: Lie-group-type neural system learning by manifold retractions.
abstract: The present manuscript treats the problem of adapting a neural signal processing system whose parameters belong to a curved manifold, which is assumed to possess the structure of a Lie group. Neural system parameter adapting is effected by optimizing a system performance criterion. Riemannian-gradient-based optimization is suggested, which cannot be performed by standard additive stepping because of the curved nature of the parameter space. Retraction-based stepping is discussed, instead, along with a companion stepsize-schedule selection procedure. A case-study of learning by optimization of a non-quadratic criterion is discussed in detail.
authors.affiliation: Dipartimento di Ingegneria Biomedica, Elettronica, e Telecomunicazioni (DIBET), Università Politecnica delle Marche, Via Brecce Bianche, I-60131 Ancona, Italy. s.fiori@univpm.it
authors.forename: Simone
authors.initials: S
authors.lastname: Fiori
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D016571:Neural Networks, Computer; D012984:Software