中文说明：读取标准手写数字库中的图像，包含60000个训练样本和10000个识别样本
English Description：
The images in the standard handwritten numeral database are read, including 60000 training samples and 10000 recognition samples
Reading images from standard handwritten numeral library
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中文说明：读取标准手写数字库中的图像，包含60000个训练样本和10000个识别样本
English Description：
The images in the standard handwritten numeral database are read, including 60000 training samples and 10000 recognition samples