Feature: Personalized PageRank (PageRank source node constraints)

[chadsr]

It would be great to see the PageRank implementation expanded to allow for Personalized PageRank (PPR) calculations.

Neo4j implements this feature as the simple argument sourceNodes; allowing a list of nodes/nodeIDs as the source possibilities (see table 2).

Another approach toward implementing this would be similar to how Networkx allows input of a personalization vector, which can contain initial starting probabilities for each node. PPR can therefore be performed by constraining all nodes except the wanted source nodes' probabilities to zero.