Keyphrases
- document retrieval
- language model
- information retrieval
- text retrieval
- retrieval model
- document collections
- ranking functions
- passage retrieval
- learning to rank
- relevant documents
- relevance feedback
- retrieved documents
- spreading activation
- xml retrieval
- cross language
- database
- document indexing
- semantic mapping
- pseudo relevance feedback
- inverted index
- machine learning