Computation of the PageRank scores for the vertices in a logical graph. Uses the Flink Gelly implementation of PageRank and computes a per-vertex score which is the sum of PageRank scores transmitted over in-edges. Each vertex's score is divided evenly among out-edges. High-scoring vertices are linked to by other high-scoring vertices; this is similar to the 'authority' score in HITS (see http://ilpubs.stanford.edu:8090/422/1/1999-66.pdf). The current implementation excludes vertices with a degree of zero from the logical graph!
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