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Qingnan Ren

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#machine learning Preprint Oct 2026

RM-OPD: On-Policy Distillation for Generative Reward Models

Reinforcement Learning on Mixed-domain preference data (Mix-RL) has become the mainstream approach for training general-purpose Generative Reward Models (GRMs). However, Mix-RL suffers from two critical bottlenecks: the reward sparsity induced by outcome rewards, and the cross-domain interference arising from jointly o...

Qing-Lin Su, Li-Cheng Pan, Zhen Fang et al. · 0 citations
#natural language process... Preprint Sep 2026

GraphForge: Training Working Agents with Graph-Anchored Workspace Synthesis

GraphForge, an evidence-graph based framework that grounds both the task and its verification in real files, and rejects fine-tuning on the SFT model's own rollouts yields further improvements on all three benchmarks, suggesting that the rubrics provide a useful selection signal.

Qi-Sheng Su, Han-Chen Wang, Guang Zhu et al. · 0 citations
Preprint Aug 2026

Video-DeepResearch: Towards the Next-Generation Multimodal Deepresearch Agent

Video-DR is introduced, featuring a decoupled perception-exploration pipeline with stage-wise tool unlocking that compels exhaustive cross-frame visual grounding prior to web retrieval, enabling autonomous exploration that breaks the imitation-learning ceiling.

Zhen Fang, Yu Zeng, Wen-Xuan Huang et al. · 1 citation · ⚡1

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