[2] [2] YANG Y,CARBONELL J,BROWN R,et al. Multi-strategy learning for topic detection and tracking[M]. New York:Springer US, 2002.

[5] [5] SAKAKI T, OKAZAKI M, MATSUO Y. Earthquake shakes Twitter users: real-time event detection by social sensors[C]// Proceedings of the 19th International Conference on World Wide Web. ACM:[s.n.],2010:851－860.

[7] [7] LIU Z, YU W, CHEN W. Short text feature selection and classification for microblog mining[C]// Proceedings of International Conference on Computational Intelligence and Software Engineering. Wuhan,China:IEEE, 2010:1-4.

[11] [11] BISHOP C M. Pattern recognition and machine learning[M]. New York:Springer, 2006.

[13] [13] DING X,HE L,CARIN L. Bayesian robust principal component analysis[J]. IEEE Transactions on Image Processing, 2011,20 (12):3419-3430.

[16] [16] JOLLIFFE I T. Principal component analysis[M]. New York:Springer-Verlag, 1986.