A NOVEL METHOD FOR TEXT CLASSIFICATION USING K-MEANS CLUSTERING AS FEATURE SELECTION
Text mining has been employed in a wide range of applications such as text summarization, text categorization, named entity extraction, and opinion and sentimental analysis. Text classification is the task of assigning predefined categories to free-text documents. Clustering of documents is used to group documents into relevant topics. Each of such group is known as clusters. It is an unsupervised learning technique. The major difficulty in document clustering is its high dimension. It requires efficient algorithms which can solve this high dimensional clustering. The high dimensionality of data is a great challenge for effective text categorization. In this paper, we discuss a text categorization method based on k-means clustering feature selection. K-means is classical algorithm for data clustering in text mining, but it is seldom used for feature selection. For text data, the words that can express correct semantic in a class are usually good features. We use k-means method to capture several cluster centroids for each class, and then choose the high frequency words in centroids as the text features for categorization. The words extracted by k-means not only can represent each class clustering well, but also own high quality for semantic expression. On normal text databases, Regularized least-squares regression based on our feature selection method exhibit better performances than original classifiers for text categorization.
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