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Louis Vassaux

dblp:440/5053 · DBLP profile ↗
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1ranked-venue papers
0as first author
1since 2021 · last 2026
—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.

Theoretical computer science
1 paper
Mathematical optimization · 33% Graph algorithms and graph theory · 33% Computational complexity · 33%

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

TopicWeightPapersLastEvidence papers
Mathematical optimization
convex relaxation
1.012026
Phase Transition in Convex Relaxations for Graph Alignment · COLT 2026
Graph algorithms and graph theory › graph matching
graph alignment
1.012026
Phase Transition in Convex Relaxations for Graph Alignment · COLT 2026
Computational complexity
phase transition
1.012026
Phase Transition in Convex Relaxations for Graph Alignment · COLT 2026

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

quadratic assignment · 1.0gaussian orthogonal ensemble · 1.0doubly stochastic relaxation · 1.0
YearPublicationVenuePosition
2026 Phase Transition in Convex Relaxations for Graph Alignment
abstract
We study the graph alignment problem for correlated Gaussian Orthogonal Ensemble (GOE) matrices, where the goal is to recover a hidden vertex permutation given two correlated symmetric Gaussian matrices $(A,B)$ with correlation $1/\sqrt{1+\sigma^2}$. While the maximum likelihood estimator is information-theoretically optimal, its computation, which reduces to a quadratic assignment problem, is intractable. Motivated by this, we analyze convex relaxations based on minimizing $\|AX - XB\|_F$ over the set of doubly stochastic matrices and the unit hypercube. We show that when the correlation parameter satisfies $\sigma = o(n^{-1/2}/\log^4 n)$, the solution of either relaxation ($X^\star$) concentrates around the ground-truth permutation matrix ($\Pi^\star$), i.e., $\|X^\star - \Pi^\star\|_F^2 = o(n)$, implying recovery of all but a vanishing fraction of vertices after simple post-processing. Combined with existing lower bounds, our results precisely characterize that $\|X^\star - \Pi^\star\|_F^2$ transitions from $o(n)$ for $\sigma = \tilde{o}(n^{-1/2})$ to $\Omega(n)$ for $\sigma = \tilde{\Omega}(n^{-1/2})$. In doing so, our analysis significantly tightens prior results and extends them beyond doubly stochastic relaxations.
Laurent Massoulié, Sushil Mahavir Varma, Louis Vassaux, Irène Waldspurger
COLT3