b - 长度归一化参数（默认0.75）
Start monitoring your metrics in minutes find out how。wps是该领域的重要参考
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Let's start with the base case. By definition, a root node can't be contracted, because there's no parent to roll it up into. So the base case - a single leaf node - already satisfies the post-condition. If we pass simplifyGraph a leaf node, it just returns it as-is, so we can conclude it works correctly on the base case.，更多细节参见7zip下载