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arXiv 1003.5474cs.DS
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角度树:高维低内禀距离最近邻搜索

Angle Tree: Nearest Neighbor Search in High Dimensions with Low Intrinsic Dimensionality

Ilia Zvedeniouk, Sanjay Chawla

摘要:

我们提出了一个扩展的基于树的空间分区索引结构的数据具有低内在维数嵌入在一个高维空间。我们把这个扩展称为角度树。我们的扩展可以适用于经典的kd-树以及最近的rp-树。我们的方法的关键思想是存储数据区域(这是一个低维流形)和分割区域的随机超平面(“分割器”)之间的角度(“二面角”)。我们表明,二面角可以用来获得一个严格的下限之间的距离查询点和任何点的相对侧的分裂。这又可以用于有效地修剪搜索空间。我们引入了一种新的随机化策略,以有效地计算二面角的高精度。在真实数据集和合成数据集上的实验和分析表明,角度树在预处理和空间使用方面是最有效的最近邻查询索引结构,同时实现了高精度和快速搜索时间。

英文摘要:

We propose an extension of tree-based space-partitioning indexing structures for data with low intrinsic dimensionality embedded in a high dimensional space. We call this extension an Angle Tree. Our extension can be applied to both classical kd-trees as well as the more recent rp-trees. The key idea of our approach is to store the angle (the "dihedral angle") between the data region (which is a low dimensional manifold) and the random hyperplane that splits the region (the "splitter"). We show that the dihedral angle can be used to obtain a tight lower bound on the distance between the query point and any point on the opposite side of the splitter. This in turn can be used to efficiently prune the search space. We introduce a novel randomized strategy to efficiently calculate the dihedral angle with a high degree of accuracy. Experiments and analysis on real and synthetic data sets shows that the Angle Tree is the most efficient known indexing structure for nearest neighbor queries in terms of preprocessing and space usage while achieving high accuracy and fast search time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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