Author

Qirui Li

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Preprint Aug 2026

SCOPE: Subspace Clustering with Online Per-Head Top-K Estimation for Sparse Video Attention

SCOPE is a training-free sparse attention framework that combines 3D-RoPE-aligned key subspace clustering with online per-head Top-$k$ estimation for efficient video-DiT inference and consistently outperforms existing training-free baselines in both fidelity and latency.

Qi Zhao, Qi-Rui Li, Hanlin Tang et al. · 0 citations

Jul 2026

Text Template Tokens Are Implicit Semantic Registers in Diffusion Transformers

A causal interpretability framework is introduced that reveals that the tokens encoding semantics at the input need not be those that maintain them during generation, but also provides a causal view of internal mechanisms in diffusion transformers.

Maohua Li, Qi-Rui Li, Yanke Zhou et al. · arXiv.org · 0 citations

Jul 2026

PhysAgent: Reflective Agentic Physics Control for Physically Plausible Video Generation

This paper proposes PhysAgent, a reflective agentic framework that closes the loop among physical program generation, physics simulation, stage-specific verification, and targeted program repair, and design a set of physics-control APIs to support more stable and complex motion behaviors.

Qirui Li, Jinkun Hao, Yibo Li et al. · arXiv.org · 1 citation