本文认为其原因是我国区域在梯度推移过程中存在着粘性，并分别建立简单的粘性模型和灰色聚类粘性模型进行分析。
The author attributes the phenomena to the stickiness in the economic gradient process and sets up simple stickiness model and grey clustering model to explain it.
传统的模糊c -均值(FCM)聚类是一种基于梯度下降的优化算法，该方法对初始化较敏感，且易陷入局部极小。
The traditional fuzzy C-means (FCM) algorithm is an optimization algorithm based on gradient descending. it is sensitive to the initial condition and liable to be trapped in a local minimum.
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