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Jiangnan Yang

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#artificial intelligence Preprint Oct 2026

Pythia: Toward Foundation World Models for Multimodal Time Series

Time-series foundation models offer a unified approach to forecasting across heterogeneous domains. Textual context and auxiliary observations provide complementary information about temporal dynamics, yet reusable multimodal predictive representations remain underexplored. We introduce Pythia, a foundation world model...

Xilin Dai, Hong-Zhou Chen, Yi-Fan Hu et al. · 0 citations
#artificial intelligence Preprint Sep 2026

When Tomorrow Becomes Today: Self-Evolving Policies for Agentic Time-Series Forecasting

TimEvolve is introduced, a frozen-backbone time series agent that converts each realized outcome into persistent joint updates of expert trust, agent path selection, and intervention strength, and demonstrates the value of learning forecasting policies from the futures encountered during deployment.

Yi-Fan Hu, Xilin Dai, Zhi-Yuan Qu et al. · 2 citations
Preprint Aug 2026

ARC: Fair Relative Advantage Comparison in Open-Ended Real-World Interaction

The proposed ARC (Advantage Regularization via Conditioning), a training recipe that restores fairer relative comparison through strategy-conditioned rollout grouping, together with hybrid rewards and entropy regularization, is proposed.

Yong-Qi Tong, Tan Li Hui Faith, C. Marcus et al. · 0 citations
Preprint Aug 2026

Ask, Condition or Abstain: Reinforcement Learning for Missing-Premise Reasoning

ACA-RL supports a new mission for NLP evaluation: measuring whether models can recognize when a task is underdetermined and handle uncertainty, not only whether they can answer fully specified questions.

Yong-Qi Tong, Zhenyu Zhang, Zimou Liu et al. · 1 citation
Preprint Aug 2026

STAGE: Controlled Objective Admission for Multi-Preference LLM Alignment

This work proposes \methodname, a stability-guided active-set controller for controlled objective admission, a stability-guided active-set controller for controlled objective admission in reward-vector RLHF, which positions objective-entry timing as a concrete control variable in reward-vector RLHF.

Yong-Qi Tong, Z. Zhang, Ruirui Wang et al. · 1 citation
Preprint Aug 2026

Diagnosis Before Recovery: Turning Agent Failures into Selective Self-Correction

DARC is proposed, a diagnosis-guided recovery harness that profiles task-family failure modes, prunes mismatched interventions from a shared recovery library, and freezes a verifier-selected success-cost policy for deployment, providing a practical route toward more reliable agents in domains where compiler-like feedba...

Pan Wang, Yihao Hu, Hang Wang et al. · 2 citations

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