Keyphrases
- information retrieval
- information retrieval systems
- information extraction
- test collection
- query expansion
- information access
- learning to rank
- search engine
- document collections
- question answering
- computational linguistics
- tf idf
- vector space model
- automatic indexing
- language modeling
- web information retrieval
- data sets
- retrieval effectiveness
- language model
- text mining
- relevance feedback
- evolutionary algorithm
- case study
- multimedia
- machine learning
- real world