parser.add_argument()已经设置了默认值，但调试时仍然报错：main.py: error: the following arguments are required: data

报错的代码：
parser.add_argument('data', type=str, default='/home/user1/datasets/cifar10', help='path to dataset')
在data前加"--"，修改后的代码：
parser.add_argument('--data', type=str, default='/home/user1/datasets/cifar10', help='path to dataset')

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