Add smart information retrieval system for TFIDF #1785
Description
https://en.wikipedia.org/wiki/SMART_Information_Retrieval_System
The current TFIDF model uses natural TF and IDF for computing TFIDF. The idea is to try various transformation like logarithmic, augmented,boolean etc. before computing the vectors.
More about this - http://www.cs.odu.edu/~jbollen/IR04/readings/article1-29-03.pdf and https://nlp.stanford.edu/IR-book/pdf/06vect.pdf
Will send a PR tomorrow.