Shengjia (Cynthia) ZhangI am an incoming Ph.D student at Zhejiang University, supervised by Prof. Jiawei Chen. Previously, I was a Master student at Zhejiang University in ZLST Lab, also supervised by Prof. Jiawei Chen. I got bacherlor degree in Chongqing University. Email / GitHub / Google Scholar / |
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Research (* denotes equal contribution)I'm interested in machine learning, large language model. |
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Talos: Optimizing Top-K Accuracy in Reommender SystemsShengjia Zhang*, Weiqin Yang*, Jiawei Chen, Peng Wu, Yuegang Sun, Gang Wang, Qihao Shi, Can Wang WWW 2026, 2026 arxiv / code / We propose Talos, a recommendation loss which optimizes Top-K accuracy in recommender systems. Talos leverages a quantile technique, which aviods the complex ranking comparison, to smoothly optimizes Top-K accuracy. |
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Breaking the Top-K Barrier: Advancing Top-K Ranking Metrics Optimization in Recommender SystemsWeiqin Yang, Jiawei Chen, Shengjia Zhang, Peng Wu, Yuegang Sun, Yan Feng, Chun Chen, Can Wang KDD 2025, 2025 arxiv / code / We propose a SL@K, a surrogate loss for optimizing NDCG@K in recommender systems. |
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Advancing Loss Functions in Recommender Systems: A Comparative Study with a Rényi Divergence-Based SolutionShengjia Zhang, Jiawei Chen, Changdong Li, Sheng Zhou, Qihao Shi, Yan Feng, Chun Chen, Can Wang AAAI 2025, 2025 arxiv / code / We propose a new robust recommendation loss function DrRL, tailored for recommender systems. |
Awards
2025 National Scholarship, Zhejiang University
2022 Outstanding Winner & Frank Giordano Award (1/15105), Mathematical Contest in Modeling (MCM)
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Design and source code from Jon Barron's website |