图神经网络的可解释性方法及GNNexplainer代码示例GNNExplainerIntroductionModelSingle-instanceexplanations(ExplanationviaStructuralInformation)Jointlearningofgraphstructuralandnodefeatureinformation(ExplanationviaFeatureInformation)Multi-instanceexplanationsthroughgraphprototypesGNNExplainermodelextensionsAnymachinelear