An Effective Framework for Automatically Generating and Ranking Topics in MOOC Videos.Jile Zhu,Xiang Li,Zhuo Wang,Ming ZhangEDM(2017)引用 24|浏览50暂无评分关键词mooc videos,ranking topics,automatically generatingAI 理解论文溯源树样例生成溯源树,研究论文发展脉络