Or how to determine what elements of the network are good sensors.
Inference diagram is constructed by drawing a directed link (xi → xj). SCCs, which are the largest subgraphs chosen such that there is a directed path from each node to every other node in the subgraph, are marked with dashed circle; root SCCs, which have no incoming links, are shaded in gray. A potential minimum set of sensor nodes, whose measurements allow us to reconstruct the state of
all other variables is shown in red.
Observability of complex systems
PNAS | February 12, 2013 | vol. 110 2460–2465
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