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Self-rank is not accurate, let's involve everyone to rank
####1. Quantity: More important websites are likely yo reveive more links from other websites ####2. Quality: Website with higher PageRank will pass higher weight
####3. Search History ...
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初始平等，数量 => 质量
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Transition Matrix
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Spider Traps{1,0,0,0}, Dead Ends{0,0,0,0} ####* Teleporting ####* PR(N) = (1 - β) * PR(N-1) * Transition Matrix + β * PR(0) β = 重新选择网页概率(0.2左右)