web - Pagerank: node pointing to itself -


can sanity check if computation/result correct on please:

if want compute pagerank value node pointing , dangling node, drop dangling node , initial (and final) pagerank [1] ???

the original page rank algorithm doesn't allow self-loops. there variations either explicitly add self-loops or consider present in link structure.

so here have complete web (or web crawled) containing 2 nodes. has self loop , link b. b has no links. leads 0 values in final pr vector. mmds book (ullman) suggests couple of options: (1) drop dead ends recursively, or (2) add taxation parameters. enter image description here in example, can delete second node. see fig ii. left 1 node self loop. remember, deleted node has not got 0 score yet. if, let's say, implementation assumes self-loop counted inlink, has pr score of 1. b has 1 successor (a) contribute it. has 2 outlinks (your looping assumption, plus link b). see fig iii. b's pr 0.5

note sums of pageranks exceed 1, , no longer represent distribution of random surfer. yet represent decent estimates of relative importance of pages. *ullman mmds, page 172-173, page 9-10 in pdf.

book reference : http://infolab.stanford.edu/~ullman/mmds/ch5.pdf


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