Lewei Lu
Author directory2026
ICA: Information-Aware Credit Assignment for Visually Grounded Long-Horizon Information-Seeking Agents
Cong Pang | Yujie YI | Xuyu Feng | Jiaqi Su | Zixuan Chen | Jiawei Hong | Tiankuo Yao | Nang Yuan | Jiapeng Luo | Lewei Lu | Xin Lou
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Cong Pang | Yujie YI | Xuyu Feng | Jiaqi Su | Zixuan Chen | Jiawei Hong | Tiankuo Yao | Nang Yuan | Jiapeng Luo | Lewei Lu | Xin Lou
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Long-horizon reinforcement learning for information seeking agents remains difficult because terminal rewards reveal whether the final answer is correct, but not which acquired information enabled it. This difficulty is amplified by text-derived webpage observations, where parsing, truncation, and summarization often produce incomplete and unstable content representations across trajectories. We propose an evidence-centric framework for web agent learning that represents information acquired through tools as identifiable units for comparison across trajectories. In particular, fetched webpages are represented as rendered snapshots, preserving layout and multimodal content as stable content-level observations. Building on these units, we introduce Information-Aware Credit Assignment, a post hoc reward propagation method that estimates turn-level utility scores from rollout success rates and assigns dense rewards to intermediate steps that introduced high-utility information. Integrated with GSPO, our method consistently improves performance on BrowseComp, GAIA, Xbench-DS, and Seal-0. Code and datasets will be released at [https://github.com/pc-inno/ICA_MM_deepsearch](https://github.com/pc-inno/ICA_MM_deepsearch).
FailureMem: A Failure-Aware Multimodal Framework for Autonomous Software Repair
Ruize Ma | Yilei Jiang | Shilin Zhang | Zheng Ma | Yi Feng | Zhi Wang | Xiangyu Yue | Chuanyi Li | Vincent Ng | Lewei Lu
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Ruize Ma | Yilei Jiang | Shilin Zhang | Zheng Ma | Yi Feng | Zhi Wang | Xiangyu Yue | Chuanyi Li | Vincent Ng | Lewei Lu
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Multimodal Automated Program Repair (MAPR) extends traditional program repair by requiring models to jointly reason over source code, textual issue descriptions, and visual artifacts such as GUI screenshots. While recent LLM-based repair systems have shown promising results, existing approaches face several limitations: rigid workflow pipelines restrict exploration during debugging, visual reasoning is often performed over full-page screenshots without localized grounding, and failed repair attempts are rarely transformed into reusable knowledge. To address these challenges, we propose FailureMem, a multimodal repair framework that integrates three key mechanisms: a hybrid workflow–agent architecture that balances structured localization with flexible reasoning, active perception tools that enable region-level visual grounding, and a Failure Memory Bank that converts past repair attempts into reusable guidance. Experiments on SWE-bench Multimodal demonstrate FailureMem improves the resolved rate over GUIRepair by 3.7%.