Multi-agent distributed optimization over a network minimizes a global
objective formed by a sum of local convex functions using only local
computation and communication. We develop and analyze a quantized distributed
algorithm based on the alternating direction method of multipliers (ADMM) when
inter-agent communications are subject to finite capacity and other practical
constraints. While existing quantized ADMM approaches only work for quadratic
local objectives, the proposed algorithm can deal with more general objective
functions (possibly non-smooth) including the LASSO. Under certain convexity
assumptions, our algorithm converges to a consensus within
$\log_{1+\eta}\Omega$ iterations, where $\eta>0$ depends on the local
objectives and the network topology, and $\Omega$ is a polynomial determined by
the quantization resolution, the distance between initial and optimal variable
values, the local objective functions and the network topology. A tight upper
bound on the consensus error is also obtained which does not depend on the size
of the network.

研究了基于交替方向乘法方法的量化分布式算法，用于解决多代理分布式优化问题，该算法适用于包括 LASSO 在内的更一般目标函数（可能是非平滑的）在有限容量和其他实际约束下进行通信。