(2)Target of Data Pre-process ●Data transformation数据变换 Standardization and gather data from different raw data. 规范化和聚集 ·Data normalization数据归一化 To unify different sources of data to a frame of reference,to facilitate rapid convergence. 把不同来源数据统一到一个参考系下，便于快速收敛比较 29 DATA Copyright 2019 by Xiaoyu Li.Copyright © 2019 by Xiaoyu Li. 29 (2) Target of Data Pre-process  Data transformation 数据变换 Standardization and gather data from different raw data. 规范化和聚集  Data normalization 数据归一化 To unify different sources of data to a frame of reference, to facilitate rapid convergence. 把不同来源数据统一到一个参考系下，便于快速收敛比较