Keyphrases
- question answering
- natural language processing
- information retrieval
- topic detection and tracking
- news articles
- test collection
- information extraction
- social media
- retrieval effectiveness
- news stories
- natural language
- hot topics
- named entities
- online news
- question answering systems
- text mining
- wordnet
- biomedical information retrieval
- keywords
- artificial intelligence
- text analysis
- topic detection
- field of natural language processing
- ir evaluation
- ontology learning
- news video
- computational linguistics
- text processing
- free text
- word sense disambiguation
- machine learning
- machine translation
- relevance feedback
- query expansion