Diversification retrieval is used to solve users' information needs,which typically described by query phrase are often ambiguous and have more than one interpretation.This paper researches microblog diversification retrieval,and proposes a novel microblog diversification retrieval method,diversification learning to rank method is applied to microblog diversification retrieval.It develops a series of social media features considering the characteristics of microblog and subtopics distribution,and adds these features one by one to the baseline model which only considering the relational features and the text diversity feature to verify the effectiveness of them.Experimental results show that diversification leaming to rank approach can solve microblog diversification retrieval problem,and improve the effectiveness of microblog retrieval.%多样性检索主要用于解决传统信息检索中面临的查询词歧义问题.为此,研究微博中的多样性检索,提出一种新的微博多样性检索方法,将多样性排序学习方法应用到微博多样性检索.开发一系列社交媒体特征和子话题分布特征,采用查询短语与博文间相关性特征和博文与博文间文本多样性特征模型作为基准,分别加入上述特征,检验其对微博多样性的影响.实验结果表明,多样性排序学习方法能有效解决微博多样性检索问题,明显提高微博检索的效果.
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