基于LDA主题模型的杭州亚运会微博话题分析

Analysis of Microblog Topics of Hangzhou Asian Games Based on LDA Topic Model

摘要: 为了探索杭州亚运会预热阶段新兴媒体传播的结构和内容，帮助相关部门更高效地进行舆论监管与引导，本文创新性地对亚运会传播内容进行LDA主题模型的构建。本文在新浪微博爬取与杭州亚运会相关内容，构建亚运会文本的隐含狄利克雷分布(Latent Dirichlet Allocation, LDA)模型，采用困惑度评价指标确定模型最优主题数，然后用框架和语境理论分别从结构和内容挖掘相关文本内涵。结果显示，亚运会预热传播内容主要围绕娱乐宣传、参与人员、基础设施、起止仪式、市场合作、竞技项目6个框架展开，展示出人们对杭州举办此次亚运会的肯定与期待；同时亚运会也为我国经济尤其是杭州经济的发展起到一定的促进作用，也为对内对外经济合作提供了契机。

Abstract: In order to explore the structure and content of emerging media communication in the warm-up stage of the Hangzhou Asian Games, and help relevant departments to more effectively supervise and guide public opinion, this paper innovatively constructs the LDA Topic model for the communication content of the Asian Games. This paper builds a Latent Dirichlet Allocation model for the text of the Asian Games by crawling Sina Weibo content related to the Hangzhou Asian Games, uses Perplexity evaluation indicators to determine the optimal number of topics in the model, and then uses the framework and context theory to mine the relevant text content from the structure and content. The results show that the warm-up communication content of the Asian Games mainly revolves around six frameworks: entertainment promotion, participants, infrastructure, start and end ceremonies, market cooperation, and competitive projects, showcasing people’s affirmation and expectation of Hangzhou hosting the Asian Games; At the same time, the Asian Games have also played a certain promoting role in the development of China’s economy, especially in Hangzhou, and provided opportunities for domestic and foreign economic cooperation.