Hang Cui et al.
NUS at TREC-13 QA Main Task
19/20
Conclusion
•Approximate relation matching for answer extraction
–Still have a hard time in dealing with difficult questions.
•Dependency relation alignment problem – words  often can’t be matched due to linguistic variations.
•Semantic matching of words/phrases is needed with relation matching.
•More effective use of topic related sentences in answering factoid/list questions.
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