AttributeError: 'Namespace' object has no attribute 'virtual_nodes'

[maple0leaves]

Hi,I have a question that I would like to get your answer.

when I run python -u train.py --config configs/crossdock_fullatom_cond.yml, A problem occurred
Traceback (most recent call last):
File "/vdisk/zzl/code/DiffSBDD-main/train.py", line 89, in
virtual_nodes=args.virtual_nodes
AttributeError: 'Namespace' object has no attribute 'virtual_nodes'

And when I add "virtual_nodes: False" in configs/crossdock_fullatom_cond.yml，it could run ,so I want to know what does "virtual_nodes" mean,Is it necessary in project?

Thank you for your time !