An Improved Algorithm to Term Weighting in Text Classification

The traditional TF-IDF algorithm is a common method that is used to measure feature weight in text categorization. However, the algorithm doesn´t take the distribution of feature terms in inter-class and intra-class into consideration. Consequently, the algorithm can´t effectively weigh the distribution proportion of feature items. In order to solve this problem, information entropy in inter-class and intra-class which describes the distribution of feature terms was used to revise TF-IDF weight. Compared with traditional TF-IDF algorithm, the results of simulation experiment have demonstrated that the improved TF-DDF algorithm can get better classification results.