Google is replacing PageRank with RankBrain and when this is complete they won’t know why certain pages are offered as the best results. Google is well aware o

Google is replacing PageRank with RankBrain and when this is complete they won’t know why certain pages are offered as the best results. Google is well aware of the problems of machine learning: http://research.google.com/pubs/pub43146.html http://research.google.com/pubs/pub43146.html