NC&IS Recommendation System The CCF Advanced Disciplines Lectures 彭波 pb@net.pku.edu.cn 北京大学信息科学技术学院 6/27/2010
Recommendation System The CCF Advanced Disciplines Lectures 彭波 pb@net.pku.edu.cn 北京大学信息科学技术学院 6/27/2010
Outline What is Recommendation System? Nearest-Neighbor Collaborative Filtering Algorithm ■Evaluation Recommendation Systems
Outline ◼ What is Recommendation System? ◼ Nearest-Neighbor Collaborative Filtering Algorithm ◼ Evaluation ◼ Recommendation Systems
NC&IS What is Recommendation System?
What is Recommendation System?
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The Problem 分类 检索 还有什么 有效的手段？
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Recommendation
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Personalized Recommendation
Everyday Examples of Recommendation Systems... Bestseller lists ■Top40 music lists The "recent returns"shelf at the library ■“Read any good books lately?? Customers who bought this also bought... Common insight:personal tastes are correlated: .If Marry and Bob both like X and Marry likes Y then Bob is more likely to like Y especially(perhaps)if Bob knows Marry
Everyday Examples of Recommendation Systems… ◼ Bestseller lists ◼ Top 40 music lists ◼ The “recent returns” shelf at the library ◼ “Read any good books lately?” ◼ Customers who bought this also bought… ◼ .... Common insight: personal tastes are correlated: •If Marry and Bob both like X and Marry likes Y then Bob is more likely to like Y •especially (perhaps) if Bob knows Marry
Sample Applications Ecommerce Product recommendations-amazon Corporate Intranets Recommendation,finding domain experts,.. ■Digital Libraries Finding pages/books people will like Medical Applications Matching patients to doctors,clinical trials,... Customer Relationship Management Matching customer problems to internal experts
Sample Applications ◼ Ecommerce ◼ Product recommendations - amazon ◼ Corporate Intranets ◼ Recommendation, finding domain experts, … ◼ Digital Libraries ◼ Finding pages/books people will like ◼ Medical Applications ◼ Matching patients to doctors, clinical trials, … ◼ Customer Relationship Management ◼ Matching customer problems to internal experts