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Title: Parameter-free Locally Accelerated Conditional Gradients
Projection-free conditional gradient (CG) methods are the algorithms of choice for constrained optimization setups in which projections are often computationally prohibitive but linear optimization over the constraint set remains computationally feasible. Unlike in projection-based methods, globally accelerated convergence rates are in general unattainable for CG. However, a very recent work on Locally accelerated CG (LaCG) has demonstrated that local acceleration for CG is possible for many settings of interest. The main downside of LaCG is that it requires knowledge of the smoothness and strong convexity parameters of the objective function. We remove this limitation by introducing a novel, Parameter-Free Locally accelerated CG (PF-LaCG) algorithm, for which we provide rigorous convergence guarantees. Our theoretical results are complemented by numerical experiments, which demonstrate local acceleration and showcase the practical improvements of PF-LaCG over non-accelerated algorithms, both in terms of iteration count and wall-clock time.
Authors:
; ; ;
Award ID(s):
2007757
Publication Date:
NSF-PAR ID:
10294963
Journal Name:
Proceedings of the 38th International Conference on Machine Learning
Volume:
139
Page Range or eLocation-ID:
1283-1293
Sponsoring Org:
National Science Foundation
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