Google couldn't guess what I was trying to ask

 

Google, call me. I want to talk about IDF.

 I mean, Inverse Document Frequency...

Oh... P.S. :

Of course it was a joke, a pun

Obviously I  don't understand A.I. at Google level. If I knew that stuff I would be... exactly here, of course.

Now serious, I did use some rudiments of that stuff for a category suggestion function on two apps.

But the whole name of the magical mechanism is TF-IDF (heart)