NTT DATA Question-Answering Experiment at the NTCIR-4 QAC2.
Toru Takaki, Yoshio Eriguchi · 2002
In this paper, we give an overview of our question-answering system for the NTCIR-3 QAC. Our system is based on an information-retrieval technique and an information-extraction technique by pattern matching. The system has three main stages: question analy-sis, passage retrieval, and answer extraction. In the passage-retrieval stage, two types of retrieval method are applied sequentially to narrow down the document quantity for the following answer-extraction stage. We have submitted our results for all three sub-tasks of the NTCIR-3 QAC ocial runs.