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Adaptive networks are well-suited to perform decentralized information processing and optimization tasks and to model various types of self-organized and complex behavior encountered in nature. Adaptive networks consist of a collection of agents with processing and learning abilities. The agents are linked together through a connection topology, and they cooperate with each other through local interactions to solve distributed optimization, estimation, and inference problems in real-time. The continuous diffusion of information across the network enables agents to adapt their performance in relation to streaming data and network conditions; it also results in improved adaptation and learning performance relative to non-cooperative agents. This article provides an overview of diffusion strategies for adaptation and learning over networks, with emphasis on mean-square-error designs. Stability and performance analyses are provided and the benefits of cooperation are highlighted. Several supporting appendices are included in an effort to make the presentation self-contained for most readers.
Ali H. Sayed, Stefan Vlaski, Virginia Bordignon
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