IDF reflects the importance of a word in a document collection for a document, often in the text, according to data mining and information extraction is used as a weighting factor. In a given file, word frequency (termfrequency-TF) refers to the frequency of a given certain word appears in the document. Inverse document frequency (inversedocument frequency, IDF) is a measure of the importance of a common word.

IDF\.classpath
...\.project
...\.settings\org.eclipse.jdt.core.prefs
...\bin\SimilarDegreeByCos.class
...\data.txt
...\resutl.txt
...\src\SimilarDegreeByCos.java
...\.settings
...\bin
...\src
IDF

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