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#machine learning Preprint Open access Oct 2026

Inference-Time Machine Unlearning via Gated Activation Redirection

Large Language Models (LLMs) memorize vast amounts of training data, raising concerns regarding privacy, copyright infringement, and safety. Machine unlearning seeks to remove the influence of a targeted forget set while preserving model performance, ideally approximating a model retrained from scratch without it. Once...

Vin\'icius Conte Turani, Ot\'avio Parraga, Jo\~ao Vitor Boer Abitante et al. · 0 citations
#machine learning Preprint Open access Oct 2026

Expected Batch Optimal Transport Plans and Consequences for Flow Matching

Solving optimal transport (OT) on random minibatches is a common surrogate for exact OT in large-scale learning. In flow matching (FM), this surrogate is used to obtain OT-like couplings that can straighten probability paths and reduce numerical integration cost. Yet, the population-level coupling induced by repeated m...

Samuel Bo\"it\'e, Julie Delon, Kimia Nadjahi · 0 citations
#machine learning Preprint Open access Oct 2026

Remember to Forget: Gated Adaptive Positional Encoding

Rotary Positional Encoding (RoPE) is widely used in modern large language models. However, when sequences are extended beyond the range seen during training, rotary phases can enter out-of-distribution regimes, leading to spurious long-range alignments, diffuse attention, and degraded retrieval. Existing remedies only...

Riccardo Ali, Alessio Borgi, Mario Severino et al. · 0 citations

Don't Get Your Kroneckers in a Twist: Gaussian Processes on High-Dimensional Incomplete Grids

CUTS-GPR enables Bayesian modelling of high-dimensional PESs - a longstanding challenge in computational chemistry by running full GPR calculations, including hyperparameter optimization, on synthetic datasets with up to 447 data points and 500 dimensions.

Mads Greisen Ho̷jlund, August Lykke-Møller, Henry B. Moss et al. · 0 citations
#machine learning Preprint Open access Oct 2026

The Minimax Rate of Perturbed Second-Order Calibration

Second-order calibration error quantifies how closely a higher-order predictor's epistemic-uncertainty estimate matches the conditional variance of the label probability on its level sets. We characterize the minimax rate of estimating the second-order calibration error for binary classification in the regime where a s...

Kamil Ciosek, Banafsheh Rafiee, Sina Ghiassian et al. · 0 citations
#machine learning Preprint Open access Oct 2026

Grokking or Glitching? How Low-Precision Drives Slingshot Loss Spikes

Deep neural networks exhibit periodic loss spikes during unregularized long-term training, a phenomenon known as the "Slingshot Mechanism." Existing work usually attributes this to intrinsic optimization dynamics, but its triggering mechanism remains unclear. This paper proves that this phenomenon is a result of floati...

Hanqing Liu, Jianjun Cao, Yuanze Li et al. · 0 citations
#machine learning Preprint Open access Oct 2026

State Stream Transformer (SST) V2: Parallel Training of Nonlinear Recurrence for Latent Space Reasoning

Current transformers discard their rich latent residual stream between positions, reconstructing latent reasoning context at each new position and leaving potential reasoning capacity untapped. The State Stream Transformer (SST) V2 enables parameter-efficient reasoning in continuous latent space through an FFN-driven n...

Thea Aviss · 0 citations
#machine learning Preprint Open access Oct 2026

CMGL: Confidence-guided Multi-omics Graph Learning for Cancer Subtype Classification

Motivation: Multi-omics integration can improve cancer subtyping, but modality informativeness and noise vary across cancer types and patients. Most graph methods for multi-omics data learn modality contributions within the downstream classification objective, leaving predictive reliability for each patient implicit. A...

Boyang Fan, Hengchuang Yin, Siyu Yi et al. · 0 citations
#machine learning Preprint Open access Oct 2026

Provably Efficient Offline-to-Online Value Adaptation with General Function Approximation

We study value adaptation in offline-to-online reinforcement learning under general function approximation. Starting from an imperfect offline pretrained $Q$-function, the learner aims to adapt it to the target environment using only a limited amount of online interaction. We first characterize the difficulty of this s...

Shangzhe Li, Weitong Zhang · 0 citations
#machine learning Preprint Open access Oct 2026

Dynamic Free-Rider Detection in Cross-Silo Federated Learning via Simulated Attack Patterns

Federated learning (FL) enables multiple clients to collaboratively train a global model by aggregating local updates without sharing private data. In this work, we focus on cross-silo FL, where each client typically represents an independent organization. However, cross-silo FL can face the challenge of free-riders, c...

Motoki Nakamura · 0 citations
#machine learning Preprint Open access Oct 2026

Stop Probing, Start Coding: Why Linear Probes and Sparse Autoencoders Fail at Compositional Generalisation

The linear representation hypothesis states that neural network activations encode high-level concepts as linear mixtures. However, under superposition, this encoding is a projection from a higher-dimensional concept space into a lower-dimensional activation space, and a linear decision boundary in the concept space ne...

Vit\'oria Barin-Pacela, Shruti Joshi, Isabela Camacho et al. · 0 citations
#machine learning Preprint Open access Oct 2026

Beyond Sample Copying: Structural Memorization in Diffusion Models

Diffusion models generalize well in practice. Paradoxically, an optimal diffusion model fully memorizes the training data and therefore fails to generalize, raising the question of what induces generalization in a real diffusion model. We show that diffusion models progressively overfit the denoising training objective...

Tim Kaiser, Markus Kollmann · 0 citations

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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.

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