AttributeError from 'torch_vertex.py'

[psh9002]

When I execute examples/ppi/main.py, there was an attribute error from /gcn_lib/sparse/torch_vertex.py.
AttributeError: module ‘torch_geometric.utils‘ has no attribute ‘scatter_‘

The latest PyG doesn't have scatter_ at torch_geometric.utils
https://pytorch-geometric.readthedocs.io/en/latest/modules/utils.html#

I resolve this issue by just adding scatter_ mathod to torch_vertex.py from previous version.

[lightaime]

Thanks, @psh9002 for your quick fix! I fixed this issue according to your suggestion.