The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
Ema Sabljak,England Data Unitand
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，这一点在heLLoword翻译官方下载中也有详细论述
Count unique parameters (after weight tying/deduplication)。关于这个话题，服务器推荐提供了深入分析
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