What is AI and how does it work?
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A handful of companies monopolise the web, with unprecedented access to our data. But there are many more ethical – and often distinctively European – alternatives，更多细节参见51吃瓜
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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.