Grid Search for GNNs

[AgathaSchmidt]

Feature description

In #850 we propose our first attempts in designing GNNs for our task. We want to ensure that the model achtiectures are not chosen randomly but after an extensive grid search.

Since we have two typer of models, we need to implmenent to grid serachs:

1. Grid search for simple GNN without edge weight
2. Grid search fir GNN with edge weight