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Research Interests Data mining, including topic models, personalized recommendation Information Retrieval, including query recommendation, learning to rank Machine learning, including probabilistic graphical models, matrix and tensor factorization, parallel and online learning algorithms for large scale data Publication Xueqi Cheng, Xiaohui Yan, Yanyan Lan, and Jiafeng Guo. BTM: Topic Modeling over Short Texts. TKDE accepted. Xiaohui Yan, Jiafeng Guo, and Xuiqi Cheng. Context-aware query recommendation by learning high-order relation in query logs. In Proceedings of the 20th ACM interna-tional conference on Information and knowledge management, CIKM’11, pages 2073-2076, New York, NY, USA, 2011. ACM.[paper, poster, bibtex] Xiaohui Yan, Jiafeng Guo, Shenhua Liu, Xuiqi Cheng and Yanfeng Wang. Clustering short text using ncut-weighted non-negative matrix factorization. In Proceedings of the 21st ACM international con-ference on Information and knowledge management, CIKM’12, pages 2259-2262, New York, NY, USA, 2012. ACM. [paper, poster, bibtex] Xiaohui Yan, Jiafeng Guo, Shenhua Liu, Xuiqi Cheng, and Yanfeng Wang. Learning Topics of Short Texts by Non-negative Matrix Factorization on Term Correlation Matrix. Pro-ceedings of the 13nd SIAM International Conference on Data Mining, SDM’13, to be appear, Austin, Texas, USA, 2013, SIAM.[paper, code(Matlab), bibtex] Xiaohui Yan, Jiafeng Guo, Yanyan Lan, and Xuiqi Cheng A Biterm Topic Model for Short Texts. In Proceedings of the 22nd international conference on World Wide Web, WWW’13, to be appear, Rio de Janeiro, Brazil, 2013, ACM. [paper, code(C++), bibtex] Project Experiences User access log statistics and analysis system. Mar. 2009-Dec. 2009 Web content extraction. Jan. 2009-Apr. 2009 Internet-based virtual computing environment.Dec. 2009-Aug. 2010 Entities relation mining.May. 2010-Aug. 2010 Context-aware web-page suggestion. Oct. 2011-Mar. 2012 (Intern in Sogou Inc.)