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S. Sabanis

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#machine learning Preprint Oct 2026

Muon meets Tamed Langevin: Momentum Preconditioning beyond Convex and gradient-Lipschitz Potentials

We consider the problem of sampling from Gibbs distributions on matrix spaces whose potential energies are neither convex nor globally gradient-Lipschitz. We introduce a family of non-quadratic kinetic energies that lead to a new underdamped Langevin system with momentum preconditioning, in which the gradient of the ki...

Nikolaos Makras, S. Sabanis · 0 citations

When Summaries Distort Decisions: Information Fidelity in LLM-Compressed Financial Analysis

Across financial filings and earnings-call transcripts, it is found that LLM-based compression can produce fluent and factually plausible compressed contexts that nevertheless alter downstream decisions, suggesting that financial compression should be evaluated not only by efficiency or factuality, but also by its abil...

Hoyoung Lee, Suhwan Park, Seung-Han Lee et al. · 3 citations
Preprint Aug 2026

The Tamed Subgradient Unadjusted Langevin Algorithm beyond Convexity

We study the problem of sampling from target distributions whose potentials are simultaneously non-smooth, subject to superlinear gradient growth, and non-convex. We introduce the Subgradient Tamed Unadjusted Langevin Algorithm (SG-TULA), a discretisation of the Langevin diffusion that operates directly on subgradients...

Iosif Lytras, Nikolaos Makras, S. Sabanis · 1 citation

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