Global Explainability of GNNs via Logic Combination of Learned Concepts

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• Steve Azzolin
• Friday 25 November 2022, 17:00-18:00
• Online (Zoom).

If you have a question about this talk, please contact Pietro Lio.

https://zoom.us/j/99166955895?pwd=SzI0M3pMVEkvNmw3Q0dqNDVRalZvdz09

While instance-level explanation of GNN is a well-studied problem with plenty of approaches being developed, providing a global explanation for the behavior of a GNN is much less explored, despite its potential in interpretability and debugging. Existing solutions either simply list local explanations for a given class, or generate a synthetic prototypical graph with maximal score for a given class, completely missing any combinatorial aspect that the GNN could have learned. In this work, we propose GLG Explainer (Global Logic-based GNN Explainer), the first Global Explainer capable of generating explanations as arbitrary Boolean combinations of learned graphical concepts. GLG Explainer is a fully differentiable architecture that takes local explanations as inputs and combines them into a logic formula over graphical concepts, represented as clusters of local explanations. Contrary to existing solutions, GLG Explainer provides accurate and human-interpretable global explanations that are aligned with ground-truth explanations (on synthetic data) or match existing domain knowledge (on real-world data). Extracted formulas are faithful to the model predictions, to the point of providing insights into some occasionally incorrect rules learned by the model, making GLG Explainer a promising diagnostic tool for learned GNNs.

https://zoom.us/j/99166955895?pwd=SzI0M3pMVEkvNmw3Q0dqNDVRalZvdz09

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