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Trung Le

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#artificial intelligence Preprint Oct 2026

Rationale-Guided Policy Optimization: Learning to Reason with Adaptive Rationale Scaffolding

On-policy reinforcement learning has become a central paradigm for improving the reasoning abilities of large language models. However, its effectiveness is often limited by reward sparsity: when a model fails to discover correct trajectories for difficult problems, the optimization process receives little useful signa...

Hoang Phan, M. Pham, Chau Pham et al. · 0 citations
#machine learning Preprint Sep 2026

Orthogonal Witness Control for Muon Optimization via Sigmoid Spectral Reshaping

A matrix-valued optimizer that preserves the singular subspaces of the gradient while applying a bounded, monotone sigmoid transformation to its singular values is introduced, and the effectiveness and robustness of Soren against established optimizers are demonstrated.

Dat Phi Van, Minh Vu Ngo, Tuc Nguyen et al. · 0 citations

Selective Off-Policy Reference Tuning with Plan Guidance

SORT adds a repair update for all-wrong prompts without changing rollout generation: it derives a plan from the reference solution, compares token probabilities with and without that plan, and gives higher weight to tokens that become more predictable under plan conditioning.

A. Duc, Tien-Phat Nguyen, T. Nguyen et al. · 1 citation
Preprint Aug 2026

LLM as Detector: An In-context Learning Approach for Tabular Anomaly Detection

LLM-Detector is proposed, a framework that utilizes the in-context learning capacity of LLMs for structured, prompt-conditioned scoring synthesis, enabling LLMs to derive anomaly detection logic from structured normal-state knowledge.

Tu Nguyen, Dang Nguyen, T. D. Le et al. · 0 citations

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