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Eigen  3.3.90 (git rev a8fdcae55d1f002966fc9b963597a404f30baa09)
#include <Eigen/MetisSupport>

This module defines an interface to the METIS reordering package (http://glaros.dtc.umn.edu/gkhome/views/metis). It can be used just as any other built-in method as explained in here.