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Provost Chapter 10 (Measuring Sparseness: Inverse Document Frequency…
Provost Chapter 10
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Beyond Bag of Words
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Topic Models
Because of the complexity of language and documents, sometimes we want an additional layer between the document and the model
N-gram Sequences
treats every individual word as a term,
discarding word order entirely
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Combining Them: TFIDF
Complete equation, Term Frequency (TF) and
Inverse Document Frequency (IDF)
TFIDF(t, d) = TF(t, d) × IDF(t)
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