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3,686 papers

#machine learning Preprint Open access Oct 2026

Online Control via Counterfactual Tracking

We study online control of a known linear dynamical system with adversarial costs and bounded disturbances, measuring regret against a general class of benchmark policies. We introduce counterfactual tracking, which separates the challenge of learning from the challenge of controlling the system. An online learner buil...

Yunzong Xu · 0 citations
#artificial intelligence Preprint Open access Oct 2026

The Llama 3 Herd of Models

Modern artificial intelligence (AI) systems are powered by foundation models. This paper presents a new set of foundation models, called Llama 3. It is a herd of language models that natively support multilinguality, coding, reasoning, and tool usage. Our largest model is a dense Transformer with 405B parameters and a...

Aaron Grattafiori (Jack), Abhimanyu Dubey (Jack), Abhinav Jauhri (Jack) et al. · 0 citations
#machine learning Preprint Open access Oct 2026

Sharp Deviations Bounds for Dirichlet Weighted Sums with Application to analysis of Bayesian algorithms

In this work, we derive sharp non-asymptotic deviation bounds for weighted sums of Dirichlet random variables. These bounds are based on a novel integral representation of the density of a weighted Dirichlet sum. This representation allows us to obtain a Gaussian-like approximation for the sum distribution using geomet...

Denis Belomestny, Pierre Menard, Alexey Naumov et al. · 0 citations
#machine learning Preprint Open access Oct 2026

On the Approximation Relationship between Optimizing Ratio of Submodular (RS) and Difference of Submodular (DS) Functions

We demonstrate that from an algorithm guaranteeing an approximation factor for the ratio of submodular (RS) optimization problem, we can build another algorithm having a different kind of approximation guarantee -- weaker than the classical one -- for the difference of submodular (DS) optimization problem, and vice ver...

Pierre Perrault, Jennifer Healey, Zheng Wen et al. · 0 citations
#artificial intelligence Preprint Open access Oct 2026

Game Plan: What AI can do for Football, and What Football can do for AI

The rapid progress in artificial intelligence (AI) and machine learning has opened unprecedented analytics possibilities in various team and individual sports, including baseball, basketball, and tennis. More recently, AI techniques have been applied to football, due to a huge increase in data collection by professiona...

Karl Tuyls, Shayegan Omidshafiei, Paul Muller et al. · 0 citations
#machine learning Preprint Open access Oct 2026

Block Disentanglement in CRL: Bridging Identifiability and Visual State Estimation

Causal representation learning (CRL) is the process of recovering causally-related latent variables from high-dimensional observations. As a label-free inference method, CRL is particularly attractive for applications where data labels are unavailable or impractical to obtain. While there has been significant progress...

Emre Acart\"urk, Pranamya Kulkarni, Puranjay Datta et al. · 0 citations
#machine learning Preprint Oct 2026

Round-Trip KNN Clustering: multiscale hierarchical cluster detection on directed nearest-neighbour graphs

We introduce Round-Trip KNN Clustering (RTKNNC), a graph-based method for finding cluster structure at several neighbourhood scales without requiring the number of clusters in advance. Unlike approaches that first make a $k$-nearest-neighbour (KNN) graph undirected, RTKNNC keeps both directions of the neighbour relatio...

E. Marinho, C. Ranieri, F. Breve · 0 citations
#machine learning Preprint Oct 2026

Hyperbolic Graph Representation Learning: Embed in One Metric, Optimize with Another

Hierarchical graphs embed in hyperbolic space with lower distortion than in Euclidean space owing to its negative curvature. However, their gradient-based learning is hampered at large radii, where the Poincar\'e ball and the Lorentz hyperboloid models fail numerically. Polar coordinates avoid this problem, but the hyp...

Federico Larroca, P. Bermolen, Marcelo Fiori et al. · 0 citations
#machine learning Preprint Oct 2026

The Birkhoff Geometry of Manifold-Constrained Hyper-Connections: Two Channels, Vertex Viscosity, and Sinkhorn as a Retraction

Hyper-connections widen the residual stream of a Transformer to $n$ parallel streams. Their manifold-constrained version (mHC) mixes the streams at each layer with a doubly stochastic matrix, which it computes by Sinkhorn normalization of exponentiated logits. We give a geometric theory of this design on the Birkhoff p...

Xiaoyu Li, Zhizhou Sha, Chi-Wun Yang · 0 citations
#machine learning Preprint Oct 2026

LinearPFN: Amortized Variable Selection for Linear Models with Interactions

Spike-and-slab regression is a standard Bayesian formulation of variable selection: it returns a posterior distribution over which candidate effects are active rather than a single selected subset, so that every candidate effect carries an inclusion probability. Its cost grows exponentially with the number of candidate...

Louis Schiekiera, Max Zimmer, Christophe Roux et al. · 0 citations
#machine learning Preprint Open access Oct 2026

Sampling Allocation of LinUCB: Optimal Design Limits in the Small-Gap Regime

We study the sampling allocation of LinUCB in the small-gap regime, where the reward gaps are of order at most $n^{-1/2}$ over the decision horizon $n$. This scaling captures the hard instances underlying worst-case regret lower bounds, for which LinUCB is known to be near optimal up to logarithmic factors in $n$. Usin...

Yujie Liu, Vincent Y. F. Tan, Yunbei Xu · 0 citations

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GPT-Lab Nov 3, 2026

Sovereignty Is the Option to Leave

Is your company’s AI sovereign? A practical guide for CIOs on AI vendor lock-in, EU Data Act switching, cloud sovereignty, and testing your exit plan before you need it. The post Sovereignty Is the Option to Leave appeared first on GPT-Lab.

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