中文说明：用于将MNIST数据文件转换成bmp图像和txt文件的matlab程序，程序中有详细注释说明，简单易用。已经测试过，正确无误。
English Description：
Matlab program is used to convert MNIST data file into bmp image and TXT file. There are detailed notes in the program, which is easy to use. It has been tested and is correct.