2.6 ELU（Exponential Linear Unit）
The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.，这一点在搜狗输入法下载中也有详细论述
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The setup can support 18,000 simultaneous wi-fi connections, while a distributed antenna system (DAS) boosts mobile phone coverage in the stadium. "So, you know your phone will work," says Phil Davies, IT Director at Everton Football Club.