Computer scienceData scienceNLPText representationCount-based text representations

TF-IDF

Denominator trick

Report a typo

Why is $1$ added to the denominator in the IDF formula?

$\text{IDF}(t, D) = \log \frac{\text{number of documents in corpus D}}{\text{number of documents in corpus D containing t + 1}}$

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Lower weights of highly frequent terms

Make the gap between the values of highly frequent terms and rare terms smoother

Avoid zero division

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