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Curriculum Sampling: A Two-Phase Curriculum for Efficient Training of Flow Matching

arXiv:2603.12517v1 Announce Type: new Abstract: Timestep sampling $p(t)$ is a central design choice in Flow Matching models, yet common practice increasingly favors static middle-biased distributions (e.g., Logit-Normal). We show that this choice induces a speed–quality trade-off: middle-biased sampling accelerates early…

When LLM Judge Scores Look Good but Best-of-N Decisions Fail

arXiv:2603.12520v1 Announce Type: new Abstract: Large language models are often used as judges to score candidate responses, then validated with a single global metric such as correlation with reference labels. This can be misleading when the real deployment task is…

Learnable Koopman-Enhanced Transformer-Based Time Series Forecasting with Spectral Control

arXiv:2602.02592v2 Announce Type: replace Abstract: This paper proposes a unified family of learnable Koopman operator parameterizations that integrate linear dynamical systems theory with modern deep learning forecasting architectures. We introduce four learnable Koopman variants-scalar-gated, per-mode gated, MLP-shaped spectral mapping, and…

A Reduction Algorithm for Markovian Contextual Linear Bandits

arXiv:2603.12530v1 Announce Type: new Abstract: Recent work shows that when contexts are drawn i.i.d., linear contextual bandits can be reduced to single-context linear bandits. This “contexts are cheap” perspective is highly advantageous, as it allows for sharper finite-time analyses and…

Knowing without Acting: The Disentangled Geometry of Safety Mechanisms in Large Language Models

arXiv:2603.05773v2 Announce Type: replace-cross Abstract: Safety alignment is often conceptualized as a monolithic process wherein harmfulness detection automatically triggers refusal. However, the persistence of jailbreak attacks suggests a fundamental mechanistic decoupling. We propose the textbf{underline{D}}isentangled textbf{underline{S}}afety textbf{underline{H}}ypothesis textbf{(DSH)}, positing that…