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将numpy数组的组名映射到索引的最快方法是什么？
我正在使用激光雷达的3D pointcloud。这些点由numpy数组给出，如下所示： points = np.array([[61651921, 416326074, 39805], [61605255, 416360555, 41124], [61664810, 416313743, 39900], [61664837, 416313749, 39910], [61674456, 416316663, 39503], [61651933, 416326074, 39802], [61679969, 416318049, 39500], [61674494, 416316677, 39508], [61651908, 416326079, 39800], [61651908, 416326087, 39802], [61664845, 416313738, 39913], [61674480, 416316668, 39503], [61679996, 416318047, 39510], [61605290, 416360572, 41118], [61605270, 416360565, 41122], [61683939, …