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Random Grids: Fast Approximate Nearest Neighbors and Range Searching for Image Search

机译:随机网格:快速近似的最近邻居和范围搜索,用于图像搜索

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We propose two solutions for both nearest neighbors and range search problems. For the nearest neighbors problem, we propose a c-approximate solution for the restricted version of the decision problem with bounded radius which is then reduced to the nearest neighbors by a known reduction. For range searching we propose a scheme that learns the parameters in a learning stage adopting them to the case of a set of points with low intrinsic dimension that are embedded in high dimensional space (common scenario for image point descriptors). We compare our algorithms to the best known methods for these problems, i.e. LSH, ANN and FLANN. We show analytically and experimentally that we can do better for moderate approximation factor. Our algorithms are trivial to parallelize. In the experiments conducted, running on couple of million images, our algorithms show meaningful speed-ups when compared with the above mentioned methods.
机译:对于近邻和范围搜索问题,我们提出了两种解决方案。对于最近邻问题,我们针对具有受限半径的决策问题的受限版本提出了c近似解,然后通过已知的约简将其简化为最近邻。对于范围搜索,我们提出了一种在学习阶段学习参数的方案,将其用于嵌入高维空间的一组具有低固有维数的点的情况下(图像点描述符的常见情况)。我们将我们的算法与针对这些问题的最著名方法进行比较,例如LSH,ANN和FLANN。我们通过分析和实验表明,对于中等近似因子,我们可以做得更好。我们的算法很难并行化。在进行了数百万张图像的实验中,与上述方法相比,我们的算法显示出有意义的加速效果。

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