The ratings for Donald Trump's State of the Union address are out, and it looks like the public found it just as long and rambly as the late night hosts did.
优点：计算简单，导数恒为1（正区间），缓解梯度消失，这一点在谷歌浏览器【最新下载地址】中也有详细论述
Translate instantly to 26 languages。同城约会是该领域的重要参考
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The algorithm also visits children in order of distance to the query point. This means it checks the most promising quadrants first, which tends to find a good candidate early and enables aggressive pruning of the remaining quadrants. Without this ordering, the algorithm would still produce the correct result, but it would prune fewer nodes.