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Inferring the Graph of Networked Dynamical Systems under Partial Observability and Spatially Colored Noise

Santos, A. S. ; Rente, D. ; Seabra, R. S. ; Moura, J.

Inferring the Graph of Networked Dynamical Systems under Partial Observability and Spatially Colored Noise, Proc IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Seoul, Korea, South, Vol. , pp. - , April, 2024.

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Abstract
In a Networked Dynamical System (NDS), each node is a system whose dynamics are coupled with the dynamics of neighboring nodes. The emph{global} dynamics naturally builds on this network of couplings and it is often excited by a noise input with nontrivial structure. The underlying network is unknown in many applications and should be inferred from observed data. We assume: i) emph{Partial observability}--- time series data is only available over a subset of the nodes; ii) emph{Input noise}--- it is correlated across distinct nodes while temporally independent, i.e., it is emph{spatially colored}. We present a emph{feasibility condition} on the noise correlation structure wherein there exists a consistent network inference estimator to recover the underlying fundamental dependencies among the observed nodes. Further, we describe a structure identification algorithm that exhibits competitive performance across distinct regimes of network connectivity, observability, and noise correlation.