The PSALSA (Personalized SALSA) function is a SQL-GR function that evaluates the similarity of nodes in a bipartite graph according to their proximity. The typical application of PSALSA is for recommendation.
The PSALSA function assigns numerical scores (between 0 and 1) to the vertices on both sides of the bipartite graph for each seed (hub) vertex. Also, for each seed vertex, the function outputs K hub/authority vertices with highest score.
The score assigned by PSALSA to a node defines the probability of visiting the node by a random walk with a restart from a seed node.