Classification Classification Problem More classification Examples Many search engine functionalities use classification Assigning labels to documents or web-pages Labels are most often topics such as yahoo- categories finance,"sports," "news>world>asia>business Labels may be genres editorials""movie-reviews"news Labels may be opinion on a person/product like hate "neutral Labels may be domain-specific interesting-to-me": not-interesting-to-me contains adult language: doesn't language identification: English, French, Chinese, search vertical: about linux versus not a ink spam": "not link spamClassification 5 More Classification Examples Many search engine functionalities use classification ▪ Assigning labels to documents or web-pages: ▪ Labels are most often topics such as Yahoo-categories ▪ "finance," "sports," "news>world>asia>business" ▪ Labels may be genres ▪ "editorials" "movie-reviews" "news” ▪ Labels may be opinion on a person/product ▪ “like”, “hate”, “neutral” ▪ Labels may be domain-specific ▪ "interesting-to-me" : "not-interesting-to-me” ▪ “contains adult language” : “doesn’t” ▪ language identification: English, French, Chinese, … ▪ search vertical: about Linux versus not ▪ “link spam” : “not link spam” Classification Problem