Author

Runmin Dong

3 papers indexed here

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Preprint Sep 2026

SGA-Flow-GRPO: Spatial Gradient-Guided Credit Assignment for Flow-GRPO

This work reformulates the transition-level log-likelihood in Flow-GRPO into a token-wise representation natively aligned with DiT patch architectures, constructing spatially fine-grained importance sampling ratios and introduces a continuous spatial credit map derived from reward gradients.

Yun-Kai Yang, Yudong Zhang, Xin-Ying Chen et al. · 0 citations

Preprint Aug 2026

ControlRef: Efficient Layout-Guided Multi-Instance Generation via Anchored 4D-RoPE

ControlRef is proposed, a highly efficient and precise multi-instance synthesis framework that achieves state-of-the-art visual fidelity and localization accuracy, while concurrently slashing inference latency by over 80% in sparse layouts and reducing memory overhead by 50% in dense scenarios.

Yun-Kai Yang, Yudong Zhang, Xin-Ying Chen et al. · 0 citations

Preprint Aug 2026

Ground, Cover, and Refine: Evidence-Centric Frame Selection for Long-Video Question Answering

GCR is proposed, a training-free framework that casts fixed-budget frame selection as a joint evidence curation problem and maintains a fixed number of chronologically ordered frames and requires no VLM training or architectural modification.

Fan Wei, Si-Ru Zhong, Run-Min Dong et al. · 2 citations