TimeLine Illustration Based on Microblogs: When Diversification Meets Metadata Re-ranking

摘要

This paper presents one approach used for the participation of the task 3 (TimeLine illustration based on Microblogs) for the CLEF Cultural Microblog Contextualization track in 2016. This task deals with the retrieval of tweets related to cultural events (music festivals). The idea is mainly to be able to get tweets that describe what happened during the shows of one festival. For the content-based aspects of the retrieval, we used the classical BM25 model [12]. Our concern was to study the impact of duplicate removal and several ways to re-ranks tweets. The obtained recall/precision evaluation results are biased by the limited number of runs considered in the pooling set for manual assessment, but the evaluation of results according to several informativeness measures show that adequate filtering increases such measure. We also describe the lessons learned from the first edition of this task and present how this impacts 2017's edition of the task.