Keyphrases
- document retrieval
- language model
- information retrieval
- document collections
- retrieval model
- relevance feedback
- text retrieval
- ranking functions
- document indexing
- document ranking
- relevant documents
- learning to rank
- pseudo relevance feedback
- spreading activation
- query terms
- cross language
- retrieved documents
- xml retrieval
- passage retrieval
- feature extraction
- natural language processing
- data structure
- retrieval effectiveness
- learning algorithm