Combining Lexicon Expansion, Information Retrieval, and Cluster-based Ranking for Biomedical Question Answering.
Aaron M. CohenJianji YangSeeger FisherBrian RoarkWilliam R. HershPublished in: TREC (2006)
Keyphrases
- question answering
- information retrieval
- information extraction
- candidate answers
- natural language
- learning to rank
- passage retrieval
- natural language processing
- text mining
- question answering systems
- ranking algorithm
- question classification
- sentence retrieval
- cross language
- syntactic information
- qa clef
- search engine
- natural language questions
- named entities
- test collection
- domain specific
- relation extraction
- document retrieval
- evaluation measures
- language model
- relevance ranking
- information retrieval systems
- web search
- relevance feedback
- knowledge representation
- relational databases
- machine learning