Mis-Enabling Gradient In AdaNPC

[Cascol-Chen]

Hi,

Thank you for your outstanding contribution. I'd like to bring to your attention a potential concern in implementation. It's possible that it might inadvertently enable gradient in adaptation (see the link below), leading to increased GPU memory consumption. Would you mind to have a check on this? https://github.com/yfzhang114/AdaNPC/blob/282e4130fa4e88878e00197561eba508ffb81448/domainbed/adapt_algorithms.py#L510C5-L510C5