Keyphrases
- user modeling
- learning to rank
- information retrieval
- collaborative filtering
- ranking functions
- user profiles
- loss function
- user model
- evaluation measures
- information filtering
- document retrieval
- recommender systems
- ranking svm
- user interface
- direct optimization
- web search
- test collection
- query dependent
- search engine
- recommendation systems
- document collections
- supervised learning
- learning to rank algorithms
- user feedback
- retrieval systems
- data mining methods
- user interests
- ranking models
- semi supervised
- directly optimize
- multimedia
- balancing exploration and exploitation