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Journal of software, 2017, 28(3): 708–720. [12] BLEI D M, NG A Y, JORDAN M I, et al. Latent dirich￾let allocation[J]. Journal of machine learning research, 2003, 3(4/5): 993–1022. [13] GRIFFITHS T L, STEYVERS M. Finding scientific top￾ics[J]. Proceedings of the national academy of sciences of the United States of America, 2004, 101(S1): 5228–5235. [14] SHI Yue, KARATZOGLOU A, BALTRUNAS L, et al. CLiMF: learning to maximize reciprocal rank with collab￾orative less-is-more filtering[C]//Proceedings of the 6th ACM conference on recommender systems. Dublin, Ire￾land: ACM, 2012: 139–146. [15] JÄRVELIN K, KEKÄLÄINEN K. Cumulated gain-based evaluation of IR techniques[J]. ACM transactions on in￾formation systems (TOIS), 2002, 20(4): 422–446. [16] LINDEN G, SMITH B, YORK J. Amazon. com recom￾mendations: item-to-item collaborative filtering[J]. IEEE internet computing, 2003, 7(1): 76–80. [17] SYMEONIDIS P. Content-based dimensionality reduc￾tion for recommender systems[M]//PREISACH C, BURKHARDT H, SCHMIDT-THIEME L, et al. Data Analysis, Machine Learning and Applications. Berlin, Heidelberg: Springer, 2008: 619–626. [18] ZHAO Xiangyu, NIU Zhendong, CHEN Wei, et al. A hy￾brid approach of topic model and matrix factorization based on two-step recommendation framework[J]. Journ￾al of intelligent information systems, 2015, 44(3): 335– 353. [19] 作者简介： 张旭，男，1991 年生，硕士研究 生，主要研究方向为智能信息处理、推 荐系统。 孙福振，男，1978 年生，副教授， 博士，主要研究方向为信息检索与数 据挖掘、推荐系统、话题检测与热点跟 踪。授权国家发明专利 6 项。发表学 术论文 30 余篇。 方春，女，1981 年生，讲师，博士， 主要研究方向为智能计算、模式识别、 生物医学研究。发表学术论文 10 余篇。 ·524· 智 能 系 统 学 报 第 14 卷