Federated learning system, federated learning apparatus, federated learning method, and federated learning program

Abstract

A federated learning apparatus in a federated learning system includes: a model storage part that replicates and stores a shared model as a local model; a local training part that trains the local model by using data held by the federated learning apparatus; a secret sharing part that decomposes a local update parameter indicating a training result of the local model into shares based on an additive secret sharing scheme and distributes the shares to other federated learning apparatuses; an aggregation and secure computation part that performs a secure computation for shares of a global update parameter by performing addition of the shares of the local update parameters and multiplication of the shares by cleartext constants; and a global training part that reconstructs the shares of the global update parameter and updates the shared model by the global update parameter.