Short introduction to Vector Space Model (VSM) In information retrieval or text mining, the term frequency - inverse document frequency also called tf-idf, is
N. Maddage, H. Li, и M. Kankanhalli. SIGIR '06: Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, стр. 67--74. New York, NY, USA, ACM Press, (2006)