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14,353 papers

#machine learning Preprint Open access Oct 2026

Scalable Sparse Autoregressive Variational Inference for Non-Gaussian Spatial Fields

Latent field models are essential for spatial statistics, but the posterior distribution of the latent field, even with a Gaussian process (GP) prior, is analytically intractable whenever the likelihood is non-Gaussian. Existing approximations are either too slow or too restrictive for large non-Gaussian datasets. We p...

Paul F. V. Wiemann, Matthias Katzfuss · 0 citations
#machine learning Preprint Open access Oct 2026

A Critical Look at Power Sampling when Test Time Sharpening LLMs

Reinforcement learning with verifiable rewards (RLVR) has substantially improved LLM reasoning, yet growing evidence suggests it mainly performs distribution sharpening: concentrating probability mass on reasoning paths the base model already produces. Recent work therefore seeks RLVR's gains without needing reward sig...

Abiel Malkani Talwar, Christopher Nemeth, Henry Moss · 0 citations
#machine learning Preprint Open access Oct 2026

Electron-Density-Informed Molecular Property Prediction Using Surrogate Functionals

Machine learning methods are increasingly used to predict chemical properties directly from the molecular structure to bypass the often prohibitive cost of quantum mechanical calculations. Recent work has shown that including the ground-state electron density as input to the machine learning model can improve accuracy...

Manuel V. Klockow, Simon Wagner, Roman Remme et al. · 0 citations
#machine learning Preprint Open access Oct 2026

JitterVLA: A Replay Benchmark for Motion Quality in VLA-Driven Human-Robot Manipulation

Vision-language-action (VLA) policies issue sparse targets whose arrival at the robot controller is delayed and irregular, so a reasonable predicted action can still produce abrupt motion near people. Remedies are evaluated on different streams, delays and metrics. JitterVLA replays identical commands and arrival trace...

Faith Ogunwoye, Didar Seyidov, Konstantin Gubernatorov et al. · 0 citations
#machine learning Preprint Open access Oct 2026

Kernel-based External Validity of Experimental Studies

The external validity of a study is the extent to which its findings generalize to unseen experimental conditions, such as datasets. We formalize the results of a study together with its research question, and define external validity as the probability that two independent and same-sized replications of the study prod...

Federico Matteucci, Gerhard Neumann · 0 citations
#machine learning Preprint Open access Oct 2026

Some remarks on the connection between generative diffusion and optimal transport

We discuss three simple connections between generative diffusion and optimal transport. First, the joint law of the data and of their Ornstein-Uhlenbeck noising is, at every time, the solution of an entropic optimal-transport problem, at a temperature set by the noise level. Backward diffusion can consequently be read...

Giulio Biroli, Marc M\'ezard · 0 citations
#machine learning Preprint Open access Oct 2026

Vocal Intensity Conversion with Continuous SPL Control via Adversarial Training

Vocal intensity conversion renders a recorded utterance at a different vocal intensity, rather than simply scaling its amplitude, while preserving its content and speaker identity. Existing systems control intensity through a reference utterance or a few discrete categories. Instead, we control the conversion with any...

Quentin Le Tellier, Albert Rilliard, Olivier Perrotin et al. · 0 citations
#machine learning Preprint Open access Oct 2026

CorrFlow: Exact and Permutation-Equivariant Flow Matching on the Correlation Elliptope

Correlation matrices combine nonlinear positive-definiteness constraints with a simultaneous row-column permutation symmetry. Their generation therefore involves two distinct problems. First, every output must remain on the correlation elliptope, irrespective of how its variables are ordered. Second, the generator must...

Gautier Marti · 0 citations
#machine learning Preprint Open access Oct 2026

Lower Bounds for Randomized Linear-Oracle Optimization over Strongly Convex Sets

Recent results [arXiv:2602.04378, arXiv:2602.22608] have established worst-case objective-error lower bounds of order $1/T^2$ after $T$ linear minimization oracle (LMO) calls, matching the upper bound [arXiv:1406.1305] in its dependence on $T$ and thereby resolving a long-standing open question. Upon close inspection,...

Sebastian Pokutta · 0 citations
#machine learning Preprint Open access Oct 2026

Probabilistic Forecasting of Electric Vehicle Charging in a Time-varying Hierarchical Infrastructure

Uncertainty quantification for electric vehicle (EV) charging demand is essential to turn the increasing pressure of EV adoption on power systems into a source of flexibility. We study a large-scale dataset of public charging stations in Scotland, where demand exhibits a hierarchical structure, organized across multipl...

Guillaume Principato, Yvenn Amara-Ouali, Yannig Goude et al. · 0 citations
#machine learning Preprint Open access Oct 2026

RARA: Robust Policy Fine-Tuning through Retrieval-Anchored Representation Alignment for Robotic Manipulation

Pre-trained robot policies, such as Vision-Language-Action (VLA) models, provide a strong foundation for generalist robotic manipulation, but adapting them to new tasks with only a few demonstrations remains challenging. Directly fine-tuning a pre-trained policy often achieves strong in-distribution performance, yet it...

Xuhui Kang, Sung-Wook Lee, Yan Zhuang et al. · 0 citations
#machine learning Preprint Oct 2026

S-Space: Exploring Spatial Workspace in Multimodal Language Models

Multimodal language models (MLLMs) exhibit promising spatial reasoning capabilities, yet the internal mechanisms supporting them remain poorly understood. We uncover S-Space, a linear representation subspace in which object-token representations encode continuous coordinates along horizontal, vertical, and distance axe...

Zhi-Yuan Shi, Xiang Li, Xing-Zhuo Guo et al. · 0 citations

From tech blogs

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Microsoft Research Blog Oct 12, 2026

Simulating student learning for better AI tutoring

StudentSim is a research system for evaluating and improving AI tutoring tools before they are tested with learners. It models how individuals may engage with tutors, giving feedback to improve tutor performance across subjects like chess, writing, and mathematics. The post Simulating student learning for better AI tutoring appeared first on Microsoft Research.

MIT News · Artificial Intelligence Oct 7, 2026

Discovering the value of humanistic inquiry

Students in MIT’s Concourse program delve deeply into the human condition, debate challenging questions, and learn to develop judgment about issues that can’t be quantified.

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