Spoken Document Retrieval by Contents Complement and Keyword Expansion Using Subordinate Concept for NTCIR-SpokenDoc.
Noboru Kanedera · NTCIR · 2013
In this paper, we report our experiments at NTCIR-10 IR for Spoken Documents (SpokenDoc) task. We participated SCR subtask of SpokenDoc. The keyword expansion using the subordinate concept and dictionary improved the mean average precision (MAP) from 0.320 to 0.324 for the lecture retrieval task. For the passage retrieval task, all of contents complement, keyword expansion, and subword were used. The subword was effective because a retrieving keyword was not contained in target in many cases. Moreover, it was found that a beginning subtopic is useful as topic information in the contents complement.