An Efficient and Reliable Asynchronous Federated Learning Scheme for Smart Public Transportation

• URL: http://arxiv.org/abs/2208.07194v1
• Date: Mon, 15 Aug 2022 13:56:29 GMT
• Title: An Efficient and Reliable Asynchronous Federated Learning Scheme for Smart Public Transportation
• Authors: Chenhao Xu, Youyang Qu, Tom H. Luan, Peter W. Eklund, Yong Xiang, Longxiang Gao
• Abstract summary: Federated learning (FL) is a distributed machine learning scheme that allows vehicles to receive continuous model updates without having to upload raw data to the cloud. This paper offers a blockchain-based asynchronous federated learning scheme with a dynamic scaling factor (DBAFL) Experiments conducted on heterogeneous devices validate outperformed learning performance, efficiency, and reliability of DBAFL.
• Score: 24.8522516507395
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Machine Learning (ML) is a distributed approach for training predictive models on the Internet of Vehicles (IoV) to enable smart public transportation. Since the traffic conditions change over time, the ML model that predicts traffic flows and the time passengers wait at stops must be updated continuously and efficiently. Federated learning (FL) is a distributed machine learning scheme that allows vehicles to receive continuous model updates without having to upload raw data to the cloud and wait for models to be trained. However, FL in smart public transportation is vulnerable to poisoning or DDoS attacks since vehicles travel in public. Besides, due to device heterogeneity and imbalanced data distributions, the synchronized aggregation strategy that collects local models from specific vehicles before aggregation is inefficient. Although Asynchronous Federated Learning (AFL) schemes are developed to improve efficiency by aggregating local models as soon as they are received, the stale local models remain unreasonably weighted, resulting in poor learning performance. To enable smarter public transportation, this paper offers a blockchain-based asynchronous federated learning scheme with a dynamic scaling factor (DBAFL). Specifically, the novel committee-based consensus algorithm for blockchain improves reliability at the lowest possible cost of time. Meanwhile, the devised dynamic scaling factor allows AFL to assign reasonable weight to stale local models. Extensive experiments conducted on heterogeneous devices validate outperformed learning performance, efficiency, and reliability of DBAFL.

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