Keyphrases
- information retrieval
- verbose queries
- retrieval model
- query terms
- short queries
- retrieval effectiveness
- document retrieval
- information retrieval systems
- vector space model
- language model
- query expansion
- test collection
- search engine
- information extraction
- document collections
- relevant documents
- question answering
- retrieval systems
- text mining
- learning to rank
- language modeling
- vector space
- text retrieval
- information access
- user queries
- search tasks
- pseudo relevance feedback
- feature vectors