Keyphrases
- document retrieval
- language model
- document collections
- retrieval model
- information retrieval
- ranking functions
- document indexing
- spreading activation
- learning to rank
- text retrieval
- inverted index
- learning algorithm
- retrieved documents
- cross language
- low dimensional
- probabilistic model
- query expansion
- relevance feedback
- pseudo relevance feedback
- relational databases
- digital libraries
- question answering systems
- decision trees
- document image retrieval