Computes three variants of the inverse document frequency (idf) for each term according to the given set of documents and adds a column containing the idf value. Smooth, normalized, and probabilistic idf. The default variant is smooth idf specified as follows: idf(t) = log(1 + (f(D) / f(d, t))).

The normalized idf is defined by: idf(t) = log(f(D) / f(d,t)).

The probabilistic idf is defined by: idf(t) = log((f(D) - f(d,t)) / f(d,t)), where f(D) is the number of all documents and f(d,t) is the number of documents containing term t.

- Type: TableTerms and related documents input tableThe input table which contains terms and documents.