Keyphrases
- document retrieval
- information retrieval
- language model
- document collections
- text retrieval
- cross language
- retrieval model
- pseudo relevance feedback
- relevance feedback
- learning to rank
- ranking functions
- relevant documents
- retrieved documents
- document ranking
- semantic mapping
- information retrieval systems
- query processing
- inverted index
- decision trees
- spreading activation
- query terms
- databases
- natural language
- retrieval strategies
- query independent
- document indexing