Add new node(s) to the graph with trained model.

[cappelchi]

Could someone suggest, how to add new node(s) to the single graph, that already has trained model for node classification, to make prediction(classification) for this new nodes with existing model?

[danielegrattarola]

Sorry for the late reply but for some reason I stopped receiving notifications.

Have you tried just adding the new node to the graph and doing the prediction? The model will work even if you add nodes at training time

[cappelchi]

But it means I can't use the pretrained model in single mode in production? New nodes need training.

[danielegrattarola]

New nodes need training.

I'm not sure what you mean by this. The GNN will be able to make predictions for new nodes because of its node-level local processing. You don't need to retrain the model everytime you add/remove nodes, that's a big part of what makes GNNs interesting.