Recommender Systems (Eric Nalisnick) Collaborative filtering Issues: scalability, extremely popular/unpopular items,… Knowledge-based collaborative filtering  Use similarity to address some of these issues Hybrid Item-to-Item Collaborative Filtering Help-desk systems (Siddarth Yagnam) Text-based help desk systems  Mixed results: reduced to keywords search Rule-based help desk systems  Ask relevant questions but are difficult to create CBR-based help desk systems  Alleviate the knowledge engineering effort  Go beyond keyword search  Result in significant reductions of call-in
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