一些用于练习的几个较小的数据集

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http://www.vision.caltech.edu/archive.html
http://www.vision.caltech.edu/visipedia/CUB-200.html
http://www.vision.caltech.edu/Image_Datasets/Caltech256/

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http://www.robots.ox.ac.uk/~vgg/data/flowers/
http://www.robots.ox.ac.uk/~vgg/data/flowers/17/index.html
http://www.robots.ox.ac.uk/~vgg/data/flowers/102/index.html

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https://cvml.ist.ac.at/AwA2/

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microsoft coco数据集2017
http://images.cocodataset.org/zips/train2017.zip
http://images.cocodataset.org/annotations/annotations_trainval2017.zip
http://images.cocodataset.org/zips/val2017.zip 
http://images.cocodataset.org/annotations/stuff_annotations_trainval2017.zip
http://images.cocodataset.org/zips/test2017.zip 
http://images.cocodataset.org/annotations/image_info_test2017.zip

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MPII数据集
http://datasets.d2.mpi-inf.mpg.de/andriluka14cvpr/mpii_human_pose_v1.tar.gz 
http://datasets.d2.mpi-inf.mpg.de/andriluka14cvpr/mpii_human_pose_v1_u12_2.zip
http://datasets.d2.mpi-inf.mpg.de/andriluka14cvpr/mpii_human_pose_v1_sequences_batch1.tar.gz 
http://datasets.d2.mpi-inf.mpg.de/andriluka14cvpr/mpii_human_pose_v1_sequences_batch2.tar.gz