e是输入，sum_e是输出，cnt_in是累加数据的个数。这个模块是我（新手）一个项目中用来累加exp(x)的一个模块。(E is the input, the sum_e is the output, and the cnt_in is the number of accumulative data. This module is a module that is used to add exp (x) to a project in my (novice) project.)