Recommendation Systems ■给出一个users和tems集合 ,Items可以是documents,products,other users.. ■向一个user推荐items,根据： ·users:和litemsl的属性信息 age,genre,price,... ·这个user以及其它user过去的pehavior Who has viewed/bought/liked what? ■来帮助人们 make decisions maintain awareness
Recommendation Systems ◼ 给出一个users和items集合 ◼ Items 可以是documents, products, other users … ◼ 向一个user推荐items，根据: ◼ users和items的属性信息 ◼ age, genre, price, … ◼ 这个user以及其它user过去的behavior ◼ Who has viewed/bought/liked what? ◼ 来帮助人们 ◼ make decisions ◼ maintain awareness
The Web,they say,is leaving the era of search and entering one of discovery. What's the difference?Search is what you do when you're looking for something. Discovery is when something wonderful that you didn't know existed,or didn't know how to ask for finds you
The Web, they say, is leaving the era of search and entering one of discovery. What's the difference? Search is what you do when you're looking for something. Discovery is when something wonderful that you didn't know existed, or didn't know how to ask for, finds you
NC&IS Nearest Neighbor Collaborative Filtering Algorithm
Nearest Neighbor Collaborative Filtering Algorithm
Ad Hoc Retrieval and Filtering ■Ad hoc retrieval(特别检索：文档集合保持不变) Q1 Q2 Collection Q3 “Fixed Size'” Q4 Q5
Ad Hoc Retrieval and Filtering ◼ Ad hoc retrieval (特别检索: 文档集合保持不变) Collection “Fixed Size” Q2 Q3 Q1 Q4 Q5
Ad Hoc Retrieval and Filtering Filtering(过滤：用户需求不变) User 2 Docs Filtered Profile for User 2 User 1 二 Docs for Profile User 1 Documents Stream
Ad Hoc Retrieval and Filtering ◼ Filtering(过滤: 用户需求不变) Documents Stream User 1 Profile User 2 Profile Docs Filtered for User 2 Docs for User 1