http://stackoverflow.i2p/questions/72591567/classification-based-on-a-list-of-words
. | 9999 | Animals | ... 2 | aabbcc . . | 8888 | AI , Computer , HiFi | ... 3 | aaabbb | 7777 | Hot Dog , Animals | ... 4 | cccbb | 6666 | Dataset , R | ... 5 | dddss | 64 | Hamburger , AI | ... Each row of the ds represents an article which has, in the column Topics , a list of words of the topics of the article itself.