Author

Iyad Assaad Nekka

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Preprint Aug 2026

Amortised Post-Hoc Explanation with Exact Preservation for Dynamic Graph Anomaly Detectors

X-StrGNN is presented, a post-hoc explanation layer that wraps a trained, frozen StrGNN and emits, for every flagged edge, dual attributions: a structural attribution identifying which contextual interactions in the enclosing subgraph drove the decision, and a temporal attribution identifying which historical snapshot...

Iyad Assaad Nekka, H. Seba, Walid Khaled Hidouci et al. · 0 citations

Preprint Aug 2026

Dual Spatial-Temporal Attribution: Architecture-Aligned Post-Hoc Explainability for Recurrent Graph Anomaly Detection

X-AddGraph is presented, a strictly post-hoc explainability framework built on a Dual Spatial-Temporal Attribution (DSTA) mechanism whose three components are each aligned with one of AddGraph's architectural modules: a gradient-based relevance attribution over the current adjacency structure (spatial), a direct readin...

Iyad Assaad Nekka, H. Seba, Khaled Walid Hidouci et al. · 0 citations