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爬虫目标：爬取本页面中的TensorFlow mnist（手写数字图片识别）数据集。
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TensorFlow Datasets
TensorFlow Datasets 是可用于 TensorFlow 或其他 Python 机器学习框架（例如 Jax）的一系列数据集。
所有数据集都作为 tf.data.Datasets 提供，助您实现易用且高性能的输入流水线。 部分数据集分类列表如下：
Image classification
- abstract_reasoning
- bigearthnet
- caltech101
- caltech_birds2010
- caltech_birds2011
- cars196
- cassava
- cats_vs_dogs
- celeb_a
- chexpert
- cifar10
- cifar100
- cifar100_n
- cifar10_1
- cifar10_corrupted
- cifar10_h
- cifar10_
- citrus_leaves
- cmaterdb
- colorectal_histology
- colorectal_histology_large
- controlled_noisy_web_labels
- curated_breast_imaging_ddsm
- cycle_ga
- deep_weeds
- diabetic_retinopathy_detection
- dmlab
- domainnet
- dtd
- emnist
- eurosat
- fashion_mnist
- flic
- food101
- geirhos_conflict_stimuli
- horses_or_humans
- i_naturalist2017
- i_naturalist2018
- i_naturalist2021
- imagenet2012
- imagenet2012_subset
- imagenet_resized
- imagenet_sketch
- imagenette
- imagewang
- kitti
- kmnist
- lvis
- malaria
- mnist
- mnist_corrupted
- omniglot
- open_images_v4
- oxford_flowers102
- oxford_iiit_pet
- places365_small
- plant_village
- pneumonia_mnist nights_stay
- resisc45
- siscore
- smallnorb
- stanford_dogs
- stanford_online_products
- stl10
- sun397
- svhn_cropped
- uc_merced
- visual_domain_decathlon
- wake_vision nights_stay