A bug in the brain_dataset.py

[Gemaxis]

Hi,

This is excellent work, but I found a bug in brain_dataset.py.
At the function named dense_to_ind_val, torch.isnan(adj)==0 will make every existing value turn into True, causing the index fully True which means every brain network is fully connected.

[yangji9181]

Thanks For the comments. The brain networks are indeed fully connected, which are different from most graphs in other domains.