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