ICTGrasper at TAC2009: Temporal Preferred Update Summarization

Update summarization is an extension of query-focused multi- document summarization which was launched at DUC 2007. The essential problem of update summarization is to attain the information novelty and topic continuity simultaneously. In this paper, we proposed several Temporal Content Filtering Methods to extract the time-varying information for the update summarization task, while the topic continuity is achieved by identifying the temporal topic signatures. Another manifold ranking approach is also adopted to summarize the topic related information while revealing the intrinsic structure at the same time. The evaluation results show that our approaches are both competitive in practice.

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