Nan Sun
Author directory2026
Beyond Query Bias: Candidate-Aware Iterative Refinement for Zero-Shot Composed Image Retrieval
Nan Sun | Jing Tang | Lei Sun | Rui Chen | Yuxing Lu | Xiangxiang Chu | Hefei Ling | Yujun Cai
Findings of the Association for Computational Linguistics: ACL 2026
Nan Sun | Jing Tang | Lei Sun | Rui Chen | Yuxing Lu | Xiangxiang Chu | Hefei Ling | Yujun Cai
Findings of the Association for Computational Linguistics: ACL 2026
Zero-Shot Composed Image Retrieval (ZS-CIR) retrieves target images using a reference image and modification text without task-specific training. Existing methods typically rely on MLLMs to generate query vectors with pre-trained models like CLIP. However, those constructed queries suffer from inherent cognitive bias due to unknown candidate distribution. We propose CoRR, a training-free framework that reframes ZS-CIR as a self-correcting process through bias-aware query refinement. CoRR uses retrieved results as feedback to perceive the candidate distribution. With carefully designed CoT prompting, the MLLM inspects the retrieved candidates to identify intent misalignments in the query and then corrects them via Historical Query Fusion. We also introduce Retrieval-Driven Caption Optimization to provide context-aligned examples, reducing phrasing and style mismatches. Experiments on public benchmarks show that CoRR significantly outperforms other SOTA methods.
CIA: Inferring the Communication Topology from LLM-based Multi-Agent Systems
Yongxuan Wu | Xixun Lin | He Zhang | Nan Sun | Kun Wang | Chuan Zhou | Shirui Pan | Yanan Cao
Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)
Yongxuan Wu | Xixun Lin | He Zhang | Nan Sun | Kun Wang | Chuan Zhou | Shirui Pan | Yanan Cao
Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)
LLM-based Multi-Agent Systems (MAS) have demonstrated remarkable capabilities in solving complex tasks. Central to MAS is the communication topology which governs how agents exchange information internally. Consequently, the security of communication topologies has attracted increasing attention. In this paper, we investigate a critical privacy risk: MAS communication topologies can be inferred under a restrictive black-box setting, exposing system vulnerabilities and posing significant intellectual property threats. To explore this risk, we propose Communication Inference Attack (CIA), a novel attack that constructs new adversarial queries to induce intermediate agents’ reasoning outputs and models their semantic correlations through the proposed global bias disentanglement and LLM-guided weak supervision. Extensive experiments on MAS with optimized communication topologies demonstrate the effectiveness of CIA, achieving an average AUC of 0.87 and a peak AUC of up to 0.99, thereby revealing the substantial privacy risk in MAS. The source code is available at https://github.com/aabbbcd/CIA.
LLM-as-RNN: Feedback-Driven Memory Rewriting for Online Learning and Sequential Prediction
Yuxing Lu | J. Ben Tamo | Jinrui Fang | Weichen Zhao | Nan Sun | Xukai Zhao | Yishan Zhong | Wenqi Shi | Jinzhuo Wang | May Dongmei Wang
Proceedings of the 15th International Joint Conference on Natural Language Processing and the 5th Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics (Volume 1: Long Papers)
Yuxing Lu | J. Ben Tamo | Jinrui Fang | Weichen Zhao | Nan Sun | Xukai Zhao | Yishan Zhong | Wenqi Shi | Jinzhuo Wang | May Dongmei Wang
Proceedings of the 15th International Joint Conference on Natural Language Processing and the 5th Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics (Volume 1: Long Papers)
Large language models (LLMs) are strong sequence predictors, but standard context accumulation offers no explicit mechanism for revising the memory carried between predictions. We propose LLM-as-RNN, an inference-time framework for online learning with frozen LLMs through a bounded natural-language memory state. At each timestep, the model predicts from the current observation and its memory, receives feedback, and rewrites the state to correct errors and retain task-relevant patterns without updating model parameters. Implemented as a structured system prompt, this state makes the adaptation process inspectable through human-readable memory traces. We evaluate LLM-as-RNN on sequential prediction benchmarks in healthcare, meteorology, and finance across Llama, Gemma, and GPT-oss model families. Comparisons with static-context and feedback-aligned baselines examine predictive performance, feedback sources, memory budgets, and inference cost. Our results demonstrate that feedback-driven memory rewriting supports online error correction and sequential prediction under a fixed memory budget, with performance varying across tasks and backbones.