(TFIDF, term frequency - inverse document frequency) に関するメモ。
IDF (inverse document frequency)
The IDF page
In 1972, Karen Spärck Jones published in the Journal of Documentation the paper which defined the term weighting scheme now known as inverse document frequency (IDF). This was reprinted in 2004
Introduction to Information Retrieval
Class-tested and coherent, this textbook teaches classical and web information retrieval, including web search and the related areas of text classification and text clustering from basic concepts.