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
Inria Lille - Nord Europe, CRIStAL - Centre de Recherche en Informatique, Signal et Automatique de Lille (CRIStAL) - UMR 9189
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 the users' 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 in the graph and a few random users), ensuring that the procedure naturally scales to large numbers of users. We analyze 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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https://hal.inria.fr/hal-02166433
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Submitted on : Wednesday, June 26, 2019 - 6:08:12 PM
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Valentina Zantedeschi, Aurélien Bellet, Marc Tommasi. Fully Decentralized Joint Learning of Personalized Models and Collaboration Graphs. [Research Report] Inria. 2019. ⟨hal-02166433⟩

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