Keyphrases
- information retrieval
- learning to rank
- information retrieval systems
- search engine
- language processing
- query expansion
- document collections
- vector space model
- knowledge discovery
- information extraction
- document retrieval
- test collection
- ir evaluation
- text processing
- language modeling
- information seeking
- question answering
- text mining
- information systems
- relevant documents
- databases
- retrieval model
- text retrieval
- web search
- information access
- search algorithm
- learning algorithm
- term weighting
- boolean queries
- machine learning