com.raphtory.algorithms.generic.centrality.WeightedPageRank

WeightedPageRank

WeightedPageRank(dampingFactor:Double = 0.85, iterateSteps:Int = 100, weightProperty = "weight"): Compute PageRank for all nodes, treating the network as weighted

Page Rank algorithm ranks nodes depending on their connections to determine how important the node is. This assumes a node is more important if it receives more connections from others. Each vertex begins with an initial state. If it has any neighbours, it sends them a message which is the inital label / the number of neighbours. Each vertex, checks its messages and computes a new label based on: the total value of messages received and the damping factor. This new value is propogated to all outgoing neighbours. A vertex will stop propogating messages if its value becomes stagnant (i.e. has a change of less than 0.00001) This process is repeated for a number of iterate step times. Most algorithms should converge after approx. 20 iterations.

Parameters

dampingFactor: Double = 0.85: Probability that a node will be randomly selected by a user traversing the graph, defaults to 0.85.
iterateSteps: Int = 100: Maximum number of iterations for the algorithm to run.
weightProperty: String = "weight": the property (if any) containing a numerical weight value for each edge, defaults to “weight”.

Note

If the weight property is not found, weight is treated as the number of edge occurrences.

States

prlabel: Double: PageRank of the node

Returns

vertex name	PageRank
`name: String`	`prlabel: Double`