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Matthieu Zimmer

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#machine learning Review Sep 2026

Tail-Influence Sampling for CVaR Policy Evaluation

Policies with similar mean returns can differ sharply in rare failures, yet estimating lower-tail conditional value-at-risk (CVaR) accurately can require many costly rollouts. When different conditional components of a stochastic workflow can be queried separately, we ask how to allocate a fixed evaluation budget to es...

P. Bourigault, Xiao-Tong Ji, Matthieu Zimmer et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Beam Search as Test-Time Self-Distillation via Counterfactual Contexts

Self-Distillation Fine-Tuning (SDFT) enables a language model to act as its own teacher: by conditioning on a demonstration, the model produces an implicit reward via pointwise mutual information, which guides on-policy learning without external supervision. However, SDFT operates at training time: it requires gradient...

Su-Ee Tan, Xiao-Tong Ji, Rasul Tutunov et al. · 0 citations
#artificial intelligence Preprint Sep 2026

iSDFT: Information-Proximal Self-Distillation for Continual Learning in LLMs

On-policy self-distillation fine-tuning (SDFT) learns new skills from demonstrations while reducing forgetting, but it always distils toward the full demonstration-conditioned teacher. This fixes teacher influence at the full-teacher endpoint, providing no control over how much demonstration information should be trans...

Ahmed Khaled Khamis, Xiao-Tong Ji, Hassan Jaber et al. · 0 citations

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