coco数据集

这个也可能有，没试过：

https://blog.csdn.net/m0_37644085/article/details/81948396

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 

预测的时候没有background：

class_name = [
    '__background__', 'person', 'bicycle', 'car', 'motorcycle', 'airplane',
    'bus', 'train', 'truck', 'boat', 'traffic light', 'fire hydrant',
    'stop sign', 'parking meter', &#