In this algorithm, sample region density is introduced. Weight vectors are updated under the condition of selecting samples with different probability according to their density.
该算法引入样本区域密度的概念，根据密度大小按不同的概率选取样本，以修正权矢量。
The surface morphologies in different regions are obviously non-uniform, and the material density of the aggregates near the sample edge is larger than that in the centre region of the sample.
在样品的边缘与中心区域形貌不一致，样品边缘区域的凝聚体的数密度要大于中心区域的数值。
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