Use gnn without reduction to predict graph actions with sb3 ppo #465
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The GNN features extractor used by rallib and sb3 are the same (except the one for sb3 derives from a BaseFeaturesExtractor) and so is the function conveting GraphInstance into torch_geometric.data.Data. We put that in common in hub/solver/utils/gnn. We also remove unused code in ray.rllib gnn code.
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