Selected Publications

1. Amazon Nova 2: Multimodal reasoning and generation models
   Amazon AGI Foundations. 2025. Amazon Tech Report. [Tweet]

2. The Amazon Nova Family of Models: Technical Report and Model Card
   Amazon AGI Foundations. 2025. Amazon Tech Report.

3. Amazon Nova Sonic: Technical report and model card
   Amazon AGI Foundations. 2025. Amazon Tech Report. [Post]

4. Adaptive Activation Alignment for Merging Large Language Model
   Xi Chen, Yue Zhang, Akshaya Shanbhogue. 2025. To appear.

5. Cluster-aware Large Language Model learning for Event Identification from Social Polls
   Xi Chen, Mayank Bumb, Vishal Kalaknonnavar, Przemyslaw A. Grabowicz. 2025. To appeal.

6. Identifying and Investigating Global News Coverage of Critical Events Such as Disasters and Terrorist Attacks
   Xi Chen*, Erica Cai*, Reagan Keeney, Ethan Zuckerman, Brendan O'connor, Przemyslaw A. Grabowicz. 2025. International AAAI Conference on Web and Social Media (ICWSM) . [Masslive coverage]

7. Global News Synchrony During the Start of the COVID-19 Pandemic
   Xi Chen, Scott A. Hale, David Jurgens, Mattia Samory, Ethan Zuckerman, Przemyslaw A. Grabowicz. 2024. International World Wide Web Conference (The WebConf) .

8. A Multilingual News Similarity Dataset for Media Network and Bias Research
   Xi Chen, Scott A. Hale, David Jurgens, Mattia Samory, Przemyslaw A. Grabowicz. 2023. International AAAI Conference on Web and Social Media (ICWSM) .

9. Multilingual Document-level Similarity
   Xi Chen, Ali Zeynali, Chico Q. Camargo, Fabian Flock, Devin Gaffney, Przemyslaw A. Grabowicz, Scott A. Hale, David Jurgens, Mattia Samory. 2022. Proceedings of The 16th International Workshop on Semantic Evaluation (at NAACL) , 2022.

10. Modeling Personalized Dynamics of Social Network and Opinion at Individual Level
    Xi Chen, Jie Tang, Yizhou Sun. 2019. Preprint.