ImportError for mask_to_index

[JiaruiWang]

The model can run successfully. However, I got the error when I try to import mask_to_index.
from torch_geometric.utils import index_to_mask, mask_to_index
ImportError: cannot import name 'mask_to_index' from 'torch_geometric.utils'
The index_to_mask can be imported.

[rusty1s]

We just recently added this function. If you want to use it, you have to install PyG from master/nightly, see here. Alternatively, you can just implement the functionality on your end. It is not too hard to do so, see here.