Keyphrases
- information retrieval
- online learning
- information retrieval systems
- test collection
- question answering
- search engine
- real time
- knowledge discovery
- information filtering
- document clustering
- text retrieval
- natural language
- artificial intelligence
- online environment
- structured documents
- vector space model
- document collections
- retrieval model
- document retrieval
- co occurrence
- machine learning
- data sets