TFIDF calculating confusion

Question

I found the following code on the internet for calculating TFIDF:

https://github.com/timtrueman/tf-idf/blob/master/tf-idf.py

I added \"1+\" in

Answer 1

1. No. Tf-idf is tf, a non-negative value, times idf, a non-negative value, so it can never be negative. This code seems to be implementing the erroneous definition of tf-idf that's been on the Wikipedia for years (it's been fixed in the meantime).