从DEAP数据库中下载数据后需要从.mat文件中提取数据，本次代码是就是提取.mat格式的数据并存储在.txt文件中。分类已做好。(After downloading the data from DEAP database, you need to extract the data from. mat file. This code is to extract the data in. mat format and store it in. txt file. The classificatio