Big Data Analysis and Mining Lecture 2: Data Preprocessing Weixiong Rao饶卫雄 Tongji University同济大学软件学院 2015 Fall wxrao@tongji.edu.cn Some of the slides are from Dr Jure Leskovec's and Prof. Zachary G Ives 2021/28 同济大学软件学院 ool of Software Engineering. Tongpi Unversity2021/2/8 1 Big Data Analysis and Mining Lecture 2: Data Preprocessing Weixiong Rao 饶卫雄 Tongji University 同济大学软件学院 2015 Fall wxrao@tongji.edu.cn *Some of the slides are from Dr Jure Leskovec’s and Prof. Zachary G. Ives