|
|
|
| LDA Topic Evolution Based on Global and Local Modeling |
| ZHANG Jian, LI Fang |
| (Deptartment of Computer Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
|
|
|
|
Abstract Topic evolution means the changes of contents and strength of a topic over time. This paper first gives the definition of topic evolution, describes two methods of topic evolution based on global and local documents. Two metrics of topic similarity and perplexity are used to evaluate both methods. The evolutions of the two topics (the real estate vs. the 2008 Olympic games) are analyzed. The experiments on the recent five years of NPC&CPPCC news reports show that topic evolution based on global documents can get good topic model, the evolution method is easy, while topic evolution based on local documents can produce fine topics and show the arising of new topics and the vanishing of old topics.
|
|
Received: 30 March 2012
Published: 30 November 2012
|
|
|
|
|
|
| [1] |
HAO Min-Hui, LIU Zhe, ZHANG Yong-Liang, ZHANG He-Ni. An Improved Total Variation-Based Image Fusion Algorithm
[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2013, 47(04): 607-612. |
| [2] |
CHENG Dong-Yang, JIANG Xing-Hao, SUN Tan-Feng. Image Classification Using Multiple Kernel Learning and Sparse Coding[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2012, 46(11): 1789-1793. |
| [3] |
WANG Jun-Chen, WANG Tian-Miao, WANG Yun, HU Lei. Point-Based Medical Image Registration and Error Prediction Considering Noise Perturbation[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2012, 46(09): 1392-1397. |
| [4] |
YIN Gui-Sheng-1, WANG Hai-Ling-1, 2 , ZHANG Jing-1, NI Jun-2, WANG Jian-3. Fast Efficient Collision Detection[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2012, 46(06): 962-966. |
| [5] |
ZHOU Yue-1, SUN Tan-Feng-1, 2 , JIANG Xing-Hao-1, 2 . Distortion Drift Compensation Algorithm with
Video Watermarking in Compressed Domain[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2012, 46(04): 630-635. |
| [6] |
XU Hua-Nan, LIU Zhe, LIU Can. Remote Sensing Image Denoising by àtrous Wavelet and Nonsubsampled Directional Filter Bank[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2012, 46(02): 233-238. |
| [7] |
GUO Yang-a, DU Zheng-Chun-a, b , YAO Zhen-Qiang-a, b . Calibration of a LargeScale 3D Laser Measurement System[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2012, 46(02): 223-227. |
| [8] |
FU Zhong-Liang. An Ensemble Learning Algorithm for Direction Prediction[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2012, 46(02): 250-058. |
| [9] |
CAI Nian, ZHANG Hai-Yuan, ZHANG Nan. Using Improved Weighted Parabolic Interpolation and Contourlet Transformation to Zoom Images for Super-resolution[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2011, 45(10): 1509-1515. |
| [10] |
LIN Zhi-Gao-a, SUN Tan-Feng-a, b , JIANG Xing-Hao-a, b . A Content Level Watermarking Scheme for H.264/AVC Video Authentication in VLC Domain[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2011, 45(10): 1531-1535. |
| [11] |
CHAO Juan-1, SUN Tan-Feng-1, 2 , JIANG Xing-Hao-1, 2 . A Video Shot Segmentation Algorithm Based on Dual-detection Model[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2011, 45(10): 1542-1546. |
| [12] |
CHEN Gu-Chun-a, SU Bo-b, WANG Shi-Lin-b, LI Sheng-Hong-a. Blind Detection of Splicing Image Based on Gray Level Co-occurrence Matrix of Image DCT Domain[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2011, 45(10): 1547-1551. |
| [13] |
HU Yong,WU Dianliang,FAN Xiumin. Virtual Reality Grid Environment for Collaborative Assembly Simulation[J]. J. Shanghai Jiaotong Univ.(Sci.) , 2010, 44(02): 238-0242. |
|
|
|
|
