The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.
南方周末：我感到难过的时候，会去听舒伯特，虽然音乐很悲伤，但会让人感觉好一些。
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PReLU: 斜率可学习，更灵活
CI/CD to Real-time