They are just describing power iteration which is a standard technique for finding the primary eigenvector. It is commonly used for web scale recommendation pr

They are just describing power iteration which is a standard technique for finding the primary eigenvector. It is commonly used for web scale recommendation problems which likely explains it's usage given the author's prior background. Also underlies pagerank. AFAIK it is quite stable but converges slowly. From my experience within 50 iterations you will have converged to a stable result.