subface

English

Etymology

sub- +‎ face

Noun

subface (plural subfaces)

1. (geometry) Part of a face
   • 2015, Zhaosong Lu, Xiaojun Chen, “Generalized Conjugate Gradient Methods for $\ell _{1}$ Regularized Convex Quadratic Programming with Finite Convergence”, in arXiv‎^[1]:

     At each iteration, our methods first identify a face of an orthant and then either perform an exact line search along the direction of the negative projected minimum-norm subgradient of the objective function or execute a CG subroutine that conducts a sequence of CG iterations until a CG iterate crosses the boundary of this face or an approximate minimizer of over this face or a subface is found.