TF-IDF in Hadoop MapReduce使用的好文章
http://marcellodesales.wordpress.com/2009/12/31/tf-idf-in-hadoop-part-1-word-frequency-in-doc/http://marcellodesales.wordpress.com/2010/01/06/tf-idf-in-hadoop-part-2-word-counts-for-docs/
http://marcellodesales.wordpress.com/2010/01/10/tf-idf-in-hadoop-part-3-documents-in-corpus-and-tfidf-computation/
TF-IDF algorithm的MapReduce实现,使用hadoop-0.20.1
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