Keyphrases
- topic detection and tracking
- test collection
- information retrieval
- document level
- spam detection
- question answering
- retrieval effectiveness
- spam filtering
- manually annotated
- test set
- web spam
- biomedical information retrieval
- creation process
- open domain
- human judgments
- pseudo relevance feedback
- relevance feedback
- coreference resolution
- question answering systems
- noun phrases
- information extraction
- spam classification
- machine learning