Make GNNWrapper forward call to backbone compatible with **kwargs #126
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Description
Quick fix to enable **kwargs in gnn wrapper backbone forward calls.
Issue
The forward call in GNNWrapper changed to include three arguments -- x_0, edge_index and edge_weight. It used to be just the first two. To ensure future compatibility, I changed the third one to use a keyword to be compatible with **kwargs. Otherwise all forward backbone functions will need to explicitly accept edge_weight, even if they don't need it.