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Yifan Hu

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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

Into the ORBIT for Time Series: Training Regimes for Foundation Models

This work introduces ORBIT (Omni-Range Bootstrap Incremental Training), a training paradigm that makes this distribution explicit and controllable and introduces Rank-Guided Cross-Depth Alignment, a training objective that uses late-layer representations as stop-gradient teachers for shallow layers without additional i...

Hongjie Xia, Yi-Ding Liu, Yi-Fan Hu et al. · 5 citations
Jun 2026

Learning Video Dynamics with Predictive Differentiable Rendering

Inspired by recent progress in 3D reconstruction with 3D Gaussian Splatting, PredGS, a lightweight and plug-and-play adapter based on 2D Gaussian representation, which could be seamlessly integrated with existing pixel space predictors, significantly improving spatial detail preservation with negligible computational o...

Yujin Tang, Tian Zhou, Xin Lin et al. · 0 citations

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