Downloadingdatafromhttps://storage.googleapis.com/tensorflow/tf-keras-datasets/t10k-labels-idx1-ubyte.gz Downloadingdatafromhttps://storage.googleapis.com/tensorflow/tf-keras-datasets/t10k-images-idx3-ubyte.gz 包括四个文件：下载有时不成功，导致缓存文件读取失败。缓存目录：~/.keras/datasets/fashion-mnist t10k-images-idx3