Add a way to initialize the `TfIdf` model with the SMART naming schema, as described in [Manning, Raghavan, and Schutze (2009)](http://nlp.stanford.edu/IR-book/html/htmledition/document-and-query-weighting-schemes-1.html)
Add a way to initialize the
TfIdfmodel with the SMART naming schema, as described in Manning, Raghavan, and Schutze (2009)