Using Syntactic Information for Improving Wfoy-Question Answering
نویسندگان
چکیده
In this paper, w e extend an existing para graph retrieval approach to why-question answ ering. The starting-point is a system that retrieves a relevant answ er for 73% o f the test questions. However, in 41% o f these cases, the h ighest ranked relevant answ er is no t ranked in the top-10. We aim to im prove the ranking by adding a re ranking m odule. For re-ranking w e con sider 31 features pertain ing to the syntactic structure o f the question and the candidate answer. We find a significant im provem ent over the baseline for both success@ 10 and M RR@ 150. The m ost im portant features for re-ranking are the baseline score, the presence o f cue w ords, the question’s m ain verb, and the relation betw een question fo cus and docum ent title.
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