Keyphrases
- machine learning
- knowledge base
- knowledge acquisition
- knowledge representation
- information retrieval
- test collection
- knowledge based systems
- retrieval effectiveness
- pseudo relevance feedback
- question answering
- description logics
- active learning
- knowledge structures
- clef ip
- artificial intelligence
- domain experts
- wordnet
- logic programming
- natural language processing
- relevance feedback
- expert systems
- background knowledge
- inference engine
- expert search
- patent retrieval
- query performance prediction
- trec blog track