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• W3126914414 abstract "We consider the problem of Byzantine fault-tolerance in the peer-to-peer (P2P) distributed gradient-descent method -- a prominent algorithm for distributed optimization in a P2P system. In this problem, the system comprises of multiple agents, and each agent has a local cost function. In the fault-free case, when all the agents are honest, the P2P distributed gradient-descent method allows all the agents to reach a consensus on a solution that minimizes their aggregate cost. However, we consider a scenario where a certain number of agents may be Byzantine faulty. Such faulty agents may not follow an algorithm correctly, and may share arbitrary incorrect information to prevent other non-faulty agents from solving the optimization problem. In the presence of Byzantine faulty agents, a more reasonable goal is to allow all the non-faulty agents to reach a consensus on a solution that minimizes the aggregate cost of all the non-faulty agents. We refer to this fault-tolerance goal as $f$-resilience where $f$ is the maximum number of Byzantine faulty agents in a system of $n$ agents, with $f < n$. Most prior work on fault-tolerance in P2P distributed optimization only consider approximate fault-tolerance wherein, unlike $f$-resilience, all the non-faulty agents' compute a minimum point of a non-uniformly weighted aggregate of their cost functions. We propose a fault-tolerance mechanism that confers provable $f$-resilience to the P2P distributed gradient-descent method, provided the non-faulty agents satisfy the necessary condition of $2f$-redundancy, defined later in the paper. Moreover, compared to prior work, our algorithm is applicable to a larger class of high-dimensional convex distributed optimization problems." @default.
• W3126914414 created "2021-02-15" @default.
• W3126914414 creator A5042521435 @default.
• W3126914414 creator A5054849639 @default.
• W3126914414 date "2021-01-28" @default.
• W3126914414 modified "2023-09-27" @default.
• W3126914414 title "Byzantine Fault-Tolerance in Peer-to-Peer Distributed Gradient-Descent." @default.
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