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arXiv · 2504.21108

On Asynchronous Multiparty Session Types for Federated Learning

Ivan Prokić·Simona Prokić·Silvia Ghilezan·Alceste Scalas·Nobuko Yoshida
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Abstract

This paper improves the session typing theory to support the modelling and verification of processes that implement federated learning protocols. To this end, we build upon the asynchronous ``bottom-up'' session typing approach by adding support for input/output operations directed towards multiple participants at the same time. We further enhance the flexibility of our typing discipline and allow for safe process replacements by introducing a session subtyping relation tailored for this setting. We formally prove safety, deadlock-freedom, liveness, and session fidelity properties for our session typing system. Moreover, we highlight the nuances of our session typing system, which (compared to previous work) reveals interesting interplays and trade-offs between safety, liveness, and the flexibility of the subtyping relation.

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Ivan Prokić, Simona Prokić, Silvia Ghilezan, Alceste Scalas, Nobuko Yoshida. 2025-04-29. On Asynchronous Multiparty Session Types for Federated Learning. https://doi.org/10.1007/978-3-032-11176-0_11

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