pSALSA - Aster Analytics

Teradata Aster® Analytics Foundation User GuideUpdate 2

Product
Aster Analytics
Release Number
7.00.02
Published
September 2017
Language
English (United States)
Last Update
2018-04-17
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uce1497542673292.ditamap
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dita:id
B700-1022
Product Category
Software

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.