Domenico Tortorella, PhD

Domenico Tortorella, PhD

Post-doc research fellow

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publications

Dynamic Graph Echo State Networks

Published in ESANN, 2021

Preliminary experiments on temporal graph classification with DynGESN, a novel reservoir computing model for dynamic graphs.

Recommended citation: D. Tortorella, A. Micheli (2021). "Dynamic Graph Echo State Networks." Proceedings of the 29th European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN 2021), pp. 99-104.
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Discrete-Time Dynamic Graph Echo State Networks

Published in Neurocomputing, 2022

DynGESN is introduced as a novel reservoir computing model for temporal graphs. More efficient then temporal graph kernels and 100x faster than temporal GNNs.

Recommended citation: A. Micheli, D. Tortorella (2022). "Discrete-Time Dynamic Graph Echo State Networks." Neurocomputing, vol. 496, pp. 85-95.
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Spectral Bounds for Graph Echo State Network Stability

Published in IJCNN, 2022

More accurate stability bounds for GESN based on graph spectral properties.

Recommended citation: D. Tortorella, C. Gallicchio, A. Micheli (2022). "Spectral Bounds for Graph Echo State Network Stability." Proceedings of the 2022 International Joint Conference on Neural Networks.
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Hierarchical Dynamics in Deep Echo State Networks

Published in ICANN, 2022

An in-depth theoretical analysis of asymptotic dynamics in Deep ESNs with different contractivity hierarchies.

Recommended citation: D. Tortorella, C. Gallicchio, A. Micheli (2022). "Hierarchical Dynamics in Deep Echo State Networks." Proceedings of the 31st International Conference on Artificial Neural Networks (ICANN 2022), pp. 668-679.
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Beyond Homophily with Graph Echo State Networks

Published in ESANN, 2022

Preliminary experiments on heterophilic node classification with GESN, showing the effectiveness of going beyond stability constraints.

Recommended citation: D. Tortorella, A. Micheli (2022). "Beyond Homophily with Graph Echo State Networks." Proceedings of the 30th European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN 2022), pp. 491-496.
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Leave Graphs Alone: Addressing Over-Squashing without Rewiring

Published in LoG, 2022

GESN achieves a significantly better accuracy on six heterophilic node classification tasks via tuning Lipschitz constants instead of resorting to graph rewiring.

Recommended citation: D. Tortorella, A. Micheli (2022). "Leave Graphs Alone: Addressing Over-Squashing without Rewiring" (Extended Abstract). Presented at the First Learning on Graphs Conference (LoG 2022), Virtual Event, December 9–12, 2022.
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Minimum Spanning Set Selection in Graph Kernels

Published in GbRPR, 2023

Minimizing the number of support vectors in SVM without any loss of accuracy via an RRQR factorization of kernel matrix.

Recommended citation: D. Tortorella, A. Micheli (2023). "Minimum Spanning Set Selection in Graph Kernels." Graph-Based Representations in Pattern Recognition. GbRPR 2023. LNCS vol. 14121, pp. 15-24.
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Richness of Node Embeddings in Graph Echo State Networks

Published in ESANN, 2023

Preliminary analysis of GESN’s node embedding richness via entropy and numerical analysis metrics.

Recommended citation: D. Tortorella, A. Micheli (2023). "Richness of Node Embeddings in Graph Echo State Networks." Proceedings of the 31st European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN 2023), pp. 11-16.
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Entropy Based Regularization Improves Performance in the Forward-Forward Algorithm

Published in ESANN, 2023

Adding a representation entropy term into the loss of Hinton’s FFA improves accuracy.

Recommended citation: M. Pardi, D. Tortorella, A. Micheli (2023). "Entropy Based Regularization Improves Performance in the Forward-Forward Algorithm." Proceedings of the 31st European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN 2023), pp. 393-398.
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Designs of Graph Echo State Networks for Node Classification

Published in Neurocomputing, 2024

Analysis of dense and sparse reservoir designs for node-level GESN via topology-dependent and topology-agnostic richness measures for node embeddings.

Recommended citation: A. Micheli, D. Tortorella (2024). "Designs of Graph Echo State Networks for Node Classification." Neurocomputing, vol. 597, 127965.
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Continuously Deep Recurrent Neural Networks

Published in ECML PKDD, 2024

A continuous-depth ESN is proposed, where a smooth depth hyperparameter regulates the extent of local connections.

Recommended citation: A. Ceni, P. F. Dominey, C. Gallicchio, A. Micheli, L. Pedrelli, D. Tortorella (2024). "Continuously Deep Recurrent Neural Networks." Machine Learning and Knowledge Discovery in Databases: Research Track. ECML PKDD 2024. LNCS vol. 14947, pp. 59-73.
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Onion Echo State Networks: A Preliminary Analysis of Dynamics

Published in ICANN, 2024

A preliminary analysis of dynamical properties of Onion ESN, a novel reservoir with groups of units presentig an annular spectrum.

Recommended citation: D. Tortorella, A. Micheli (2024). "Onion Echo State Networks: A Preliminary Analysis of Dynamics." Proceedings of the 33rd International Conference on Artificial Neural Networks (ICANN 2024), LNCS vol. 15025, pp. 117-128.
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Continual Learning with Graph Reservoirs: Preliminary experiments in graph classification

Published in ESANN, 2024

GESN relieves part of catastrophic forgetting in the continual learning setting by avoiding training representations for graph classification.

Recommended citation: D. Tortorella, A. Micheli (2024). "Continual Learning with Graph Reservoirs: Preliminary experiments in graph classification." Proceedings of the 32nd European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN 2024), pp. 35-40.
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Analyzing Explanations of Deep Graph Networks through Node Centrality and Connectivity

Published in Discovery Science, 2024

We analyze the alignment of DGNs explanations to node centrality and graph connectivity, highlighting the presence of different inductive biases.

Recommended citation: M. Fontanesi, A. Micheli, M. Podda, D. Tortorella (2024). "Analyzing Explanations of Deep Graph Networks through Node Centrality and Connectivity." Discovery Science 2024, to appear.

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