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20242026
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cs.AI2026

The Illusion of : Evaluating the Breakdown of Counterfactual Reasoning in LLMs

Yucheng Wang, Yuetian Du, Zhengyi Liu +8

Counterfactual reasoning requires models to reason beyond the observed world and explain how altered conditions propagate through downstream consequences. Existing benchmarks large…

cs.AI2026

MetaRAG: Belief-Action Aligned Policy Optimization for Agentic RAG

Qiuyi Qi, Tian Liang, Jiamu Wang +7

Agentic retrieval-augmented generation (RAG) requires language models to decide when to continue searching and when to answer. Existing RL-based methods rely on external supervisio…

cs.AI2026

: Discrete Diffusion with Regulation Reinforcement for Single-Cell Perturbation Prediction

Ninghan Fan, Qi Liu, Xunuo Zhu +9

Predicting single-cell transcriptomic responses to genetic perturbations is central to functional genomics and virtual-cell modeling. Existing approaches, however, typically predic…

cs.AI2026

STAPO: Selective Trajectory-Aware Policy Optimization for LLM Agent Training

Qiuyi Qi, Tian Liang, Mutian Bao +8

Reinforcement Learning (RL) is the dominant paradigm for training Large Language Model (LLM) agents on long-horizon tasks. However, sparse and delayed rewards often lead to traject…

cs.AI2026

CARL: Constraint-Aware Reinforcement Learning for Planning with LLMs

Qiuyi Qi, Jinjian Zhang, Mutian Bao +9

Despite their strong reasoning capabilities and extensive world knowledge, Large Language Models (LLMs) frequently generate plans that violate task constraints, undermining their r…