coco.py 文件源码

def default_transform(size):
    transform = transforms.Compose([
        transforms.Scale(size),
        transforms.CenterCrop(size),
        transforms.ToTensor(),
        transforms.Normalize(mean=[0.485, 0.456, 0.406], # resnet imagnet
                             std=[0.229, 0.224, 0.225])
    ])
    return transform