Keyphrases
- information retrieval
- information retrieval systems
- document collections
- search engine
- test collection
- question answering
- information extraction
- learning to rank
- image sequences
- computational linguistics
- relevant documents
- database
- vector space model
- natural language processing
- information filtering
- text processing
- query expansion
- retrieval effectiveness
- retrieval model
- document retrieval
- language model
- text mining
- web pages
- feature selection
- machine learning