https://s3.amazonaws.com/img-datasets/mnist.npz
下载数据集,因为服务器在国外,再加上服务器不稳定,很容易下载失败,因此能够先经过浏览器或者迅雷将mnist.npz文件先下载下来或者找一个其余稳定的文件下载地址# 地址 /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/keras/datasets/mnist.py
path = get_file(path, origin='https://s3.amazonaws.com/img-datasets/mnist.npz', file_hash='8a61469f7ea1b51cbae51d4f78837e45')
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/~/.keras/datasets/
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