Recommendation systems Paolo Ferragina Dipartimento di Informatica Università di Pisa Slides only!

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Presentation transcript:

Recommendation systems Paolo Ferragina Dipartimento di Informatica Università di Pisa Slides only!

Recommendations We have a list of restaurants with  and  ratings for some Which restaurant(s) should I recommend to Dave?

Basic Algorithm Recommend the most popular restaurants say # positive votes minus # negative votes What if Dave does not like Spaghetti?

Smart Algorithm Basic idea: find the person “most similar” to Dave according to cosine-similarity (i.e. Estie), and then recommend something this person likes. Perhaps recommend Straits Cafe to Dave  Do you want to rely on one person’s opinions?

Main idea U V W d1 d2 d5 d3 d4 d6 Y d7 What do we suggest to U ?

Search Engines Advertising Slides only!

Classic approach… Socio-demo Geographic Contextual

Search Engines vs Advertisement First generation -- use only on-page, web-text data Word frequency and language Second generation -- use off-page, web-graph data Link (or connectivity) analysis Anchor-text (How people refer to a page) Third generation -- answer “ the need behind the query ” Focus on “ user need ”, rather than on query Integrate multiple data-sources Click-through data Pure search vs Paid search Ads show on search (who pays more), Goto/Overture 2003 Google/Yahoo New model All players now have: SE, Adv platform + network

The new scenario SEs make possible aggregation of interests unlimited selection (Amazon, Netflix,...) Incentives for specialized niche players The biggest money is in the smallest sales !!

Two new approaches Sponsored search : Ads driven by search keywords (and user-profile issuing them) AdWords

-$ +$

Two new approaches Sponsored search : Ads driven by search keywords (and user-profile issuing them) Context match : Ads driven by the content of a web page (and user-profile reaching that page) AdWords AdSense

How does it work ? 1)Match Ads to query or pg content 2)Order the Ads 3)Pricing on a click-through IR Econ

Visited Pages Clicked Banner Web Searches Clicks on Search Results Web usage data !!!

Dictionary problem

A new game For advertisers: What words to buy, how much to pay SPAM is an economic activity For search engines owners: How to price the words Find the right Ad Keyword suggestion, geo-coding, business control, language restriction, proper Ad display Similar to web searching, but: Ad-DB is smaller, Ad-items are small pages, ranking depends on clicks