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Fully Decentralized Joint Learning of Personalized Models and Collaboration Graphs

Valentina Zantedeschi 1 Aurélien Bellet 2 Marc Tommasi 2
2 MAGNET - Machine Learning in Information Networks
CRIStAL - Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189, Inria Lille - Nord Europe
Abstract : We consider the fully decentralized machine learning scenario where many users with personal datasets collaborate to learn models through local peer-to-peer exchanges, without a central coordinator. We propose to train personalized models that leverage a collaboration graph describing the relationships between user personal tasks, which we learn jointly with the models. Our fully decentralized optimization procedure alternates between training nonlinear models given the graph in a greedy boosting manner, and updating the collaboration graph (with controlled sparsity) given the models. Throughout the process, users exchange messages only with a small number of peers (their direct neighbors when updating the models, and a few random users when updating the graph), ensuring that the procedure naturally scales with the number of users. Overall, our approach is communication-efficient and avoids exchanging personal data. We provide an extensive analysis of the convergence rate, memory and communication complexity of our approach, and demonstrate its benefits compared to competing techniques on synthetic and real datasets.
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Contributor : Aurélien Bellet <>
Submitted on : Wednesday, January 6, 2021 - 2:30:54 PM
Last modification on : Thursday, January 7, 2021 - 3:41:18 AM


  • HAL Id : hal-03100057, version 1


Valentina Zantedeschi, Aurélien Bellet, Marc Tommasi. Fully Decentralized Joint Learning of Personalized Models and Collaboration Graphs. 23rd International Conference on Artificial Intelligence and Statistics (AISTATS 2020), 2020, Virtual, Italy. ⟨hal-03100057⟩



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