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Paxton M. Turner

dblp:354/4574 · DBLP profile ↗
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1ranked-venue papers
0as first author
1since 2021 · last 2023
—ORCID · none

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

Artificial intelligence and machine learning · 1 · 1 since 2021

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.

Artificial intelligence
1 paper
Learning theory · 100%
Theoretical computer science
1 paper
Computational geometry · 100%

Topics — the 3 heaviest of 3, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Machine learning › Learning theory
random matrix theory
0.712023
Near-optimal fitting of ellipsoids to random points · COLT 2023
Machine learning › Learning theory
statistical estimation
0.712023
Near-optimal fitting of ellipsoids to random points · COLT 2023
Computational geometry › geometric modeling and processing › point cloud analysis › geometric reconstruction
ellipsoid fitting
0.712023
Near-optimal fitting of ellipsoids to random points · COLT 2023

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

neumann expansion · 1.3least squares · 1.3graph matrix theory · 1.3
YearPublicationVenuePosition
2023 Near-optimal fitting of ellipsoids to random points
abstract
Given independent standard Gaussian points $v_1, \ldots, v_n$ in dimension $d$, for what values of $(n, d)$ does there exist with high probability an origin-symmetric ellipsoid that simultaneously passes through all of the points? This basic problem of fitting an ellipsoid to random points has connections to low-rank matrix decompositions, independent component analysis, and principal component analysis. Based on strong numerical evidence, Saunderson, Parrilo, and Willsky [Proc. of Conference on Decision and Control, pp. 6031-6036, 2013] conjectured that the ellipsoid fitting problem transitions from feasible to infeasible as the number of points $n$ increases, with a sharp threshold at $n \sim d^2/4$. We resolve this conjecture up to logarithmic factors by constructing a fitting ellipsoid for some $n = d^2/\mathrm{polylog}(d)$. Our proof demonstrates feasibility of the least squares construction of Saunderson et al. using a convenient decomposition of a certain non-standard random matrix and a careful analysis of its Neumann expansion via the theory of graph matrices.
Aaron Potechin, Paxton M. Turner, Prayaag Venkat, Alexander S. Wein
COLT2