局部分类器在待查询数据的邻域内工作，此邻域基于一个局部测度而生成。

The local classifier works in query's neighborhood, and the neighborhood is developed according to a local metric.

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八叉树不易表达场景的相邻结点，本文设计了邻域查找算法以进行八叉树中相邻结点的查询。

In view of that the octree is not easy to express the adjacent nodes, we design a neighborhood search algorithms for querying the adjacent nodes.

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