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Sijia Wen

5 accepted papers

2025

Beyond the Surface: A Solution-Aware Retrieval Model for Competition-level Code Generation

EMNLP 2025

In competitive programming task, problem statements are often embedded within elaborate narrative backgrounds, requiring deep understanding of the underlying solutions to successfully complete the tasks. Current code generation models primarily focus on token-level semantic modeling, highly suscepti

2025

Defending Against Sophisticated Poisoning Attacks with RL-based Aggregation in Federated Learning

AAAI 2025technical

Federated learning is susceptible to model poisoning attacks, especially those meticulously crafted for servers. Traditional defense methods mainly focus on updating assessments or robust aggregation against manually crafted myopic attacks. When facing advanced attacks, their defense stability is no…

2025

Detecting Stealthy Backdoor Samples based on Intra-class Distance for Large Language Models

EMNLP 2025

Stealthy data poisoning during fine-tuning can backdoor large language models (LLMs), threatening downstream safety. Existing detectors either use classifier-style probability signals—ill-suited to generation—or rely on rewriting, which can degrade quality and even introduce new triggers. We address

2025

High-Fidelity Polarimetric Implicit 3D Reconstruction with View-Dependent Physical Representation

AAAI 2025technical

Neural implicit methods have made remarkable progress in 3D reconstruction. However, previous methods often assume view-independent properties of target objects, which fails to accurately reconstruct objects with challenging characteristics, such as transparency and high reflectivity. To address thi…

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