Experiment part
IO-bridge : consider only siblings of the target page within a human labeled dataset
bridge : if two or more pages have the same class, while not committing what that class would be, we call these documents bridges.
IO-bridge : a page B points to both document b1 and b2, and the way from b1 to b2 is to traverse the edge (B,b1) against its direction and then (B,b2). So B is IO-bridge for b1 and b2 because of the inlink to B (b1->B) and followed by an outlink (B->b2). http://delivery.acm.org/10.1145/280000/276332/p307-chakrabarti.pdf?key1=276332&key2=0117839611&coll=GUIDE&dl=GUIDE&CFID=9534706&CFTOKEN=44327035
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