Hang Cui et al.
NUS at TREC-13 QA Main Task
5/20
Dependency Relation Matching in QA
•Tried before
–PIQASso and MIT systems have applied dependency relations in QA.
–Used exact match of relations to extract answers directly.
•Why need to consider dependency relations?
–An upper bound of 70% for answer extraction (Light et al., 2001)
•Many NE’s with the same type appearing close to each other.
–Some questions don’t have NE-type targets.
•E.g. what does AARP stand for?