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Fourth IEEE International Conference on Data Mining (ICDM'04) (2004)
Brighton, United Kingdom
Nov. 1, 2004 to Nov. 4, 2004
ISBN: 0-7695-2142-8
pp: 162-169
Tao Liu , Nankai University, China
Zheng Chen , Microsoft Research Asia
Benyu Zhang , Microsoft Research Asia
Wei-ying Ma , Microsoft Research Asia
Gongyi Wu , Nankai University, China
Latent Semantic Indexing (LSI) has been shown to be extremely useful in information retrieval, but it is not an optimal representation for text classification. It always drops the text classification performance when being applied to the whole training set (global LSI) because this completely unsupervised method ignores class discrimination while only concentrating on representation. Some local LSI methods have been proposed to improve the classification by utilizing class discrimination information. However, their performance improvements over original term vectors are still very limited. In this paper, we propose a new local LSI method called "Local Relevancy Weighted LSI" to improve text classification by performing a separate Single Value Decomposition (SVD) on the transformed local region of each class. Experimental results show that our method is much better than global LSI and traditional local LSI methods on classification within a much smaller LSI dimension.

Z. Chen, W. Ma, B. Zhang, T. Liu and G. Wu, "Improving Text Classification using Local Latent Semantic Indexing," Fourth IEEE International Conference on Data Mining (ICDM'04)(ICDM), Brighton, United Kingdom, 2004, pp. 162-169.
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