Created
February 2, 2011 11:34
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TFIDF measure in ruby based on the DefaultSimilarity implementation in Apache Lucene, http://lucene.apache.org/
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| def similarity(term_frequency, document_frequency, documents_count) | |
| idf = Math.log(documents_count / (document_frequency + 1.0)) + 1 | |
| Math.sqrt(term_frequency) * idf | |
| end |
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