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Gal Korcia

dblp:280/1653 · DBLP profile ↗
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1ranked-venue papers
0as first author
0since 2021 · last 2020
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Artificial intelligence and machine learning · 1

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Theoretical computer science
1 paper
Mathematical optimization · 61% Algorithms and data structures · 39%

Topics — the 4 heaviest of 4, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Mathematical optimization › online optimization
online convex optimization
0.412020
Online Convex Optimization in the Random Order Model · ICML 2020
Mathematical optimization
online optimization
0.412020
Online Convex Optimization in the Random Order Model · ICML 2020
Algorithms and data structures › analysis of algorithms › beyond worst-case analysis
random-order model
0.412020
Online Convex Optimization in the Random Order Model · ICML 2020
Algorithms and data structures › numerical linear algebra › dimensionality reduction › principal component analysis
online PCA
0.112020
Online Convex Optimization in the Random Order Model · ICML 2020

Methods — techniques the papers use, named apart from their topics

online gradient descent · 0.4SVD · 0.4
YearPublicationVenuePosition
2020 Online Convex Optimization in the Random Order Model
abstract
Online Convex Optimization (OCO) is a powerful framework for sequential prediction, portraying the natural uncertainty inherent in data-streams as though the data were generated by an almost omniscient adversary. However, this view, which is often too pessimistic for real-world data, comes with a price. The complexity of solving many important online tasks in this adversarial framework becomes much worse than that of their offline and even stochastic counterparts. In this work we consider a natural random-order version of the OCO model, in which the adversary can choose the set of loss functions, but does not get to choose the order in which they are supplied to the learner; Instead, they are observed in uniformly random order. Focusing on two important families of online tasks, one in which the cumulative loss function is strongly convex (though individual loss functions may not even be convex), and the other being online $k$-PCA, we show that under standard well-conditioned-data assumptions, standard online gradient descent (OGD) methods become much more efficient in the random-order model. In particular, for the first group of tasks OGD guarantees poly-logarithmic regret. In the case of online $k$-PCA, OGD guarantees sublinear regret using only a rank-$k$ SVD on each iteration and memory linear in the size of the solution.
Dan Garber, Gal Korcia, Kfir Y. Levy
ICML2