Jupyter Notebook使用argparse包 问题

在jupyter notebook 中使用argparse函数时，可能会出现错误。

问题

error1

usage: ipykernel_launcher.py [-h] [–dir DIR] [–dataset DATASET]
[–data_path PATH] [–batch_size N]
[–num_workers N] [–model MODEL] [–resume CKPT]
[–epochs N] [–save_freq N] [–eval_freq N]
[–lr_init LR] [–momentum M] [–wd WD] [–swa]
[–swa_start N] [–swa_lr LR] [–swa_c_epochs N]
[–seed S]
ipykernel_launcher.py: error: unrecognized arguments: -f /run/user/0/jupyter/kernel-830bbab2-2005-4170-bef0-3586b3877e0a.json
An exception has occurred, use %tb to see the full traceback.
SystemExit: 2

error2

usage: ipykernel_launcher.py [-h] --dir DIR [–dataset DATASET]
[–data_path PATH] [–batch_size N]
[–num_workers N] [–model MODEL] [–resume CKPT]
[–epochs N] [–save_freq N] [–eval_freq N]
[–lr_init LR] [–momentum M] [–wd WD] [–swa]
[–swa_start N] [–swa_lr LR] [–swa_c_epochs N]
[–seed S]
ipykernel_launcher.py: error: the following arguments are required: --dir
An exception has occurred, use %tb to see the full traceback.
SystemExit: 2

解决

error1

添加args=[]
opt=parser.parse_args(args=[])

error2

设置 required=False
出现这种错误是因为 required=True，设置为False即可。
parser.add_argument(’–dir’, type=str, default=None, required=True, help=‘training directory (default: None)’)

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