这是一个对于L2范数下的Earth Mover Distance的VC实现。

image retrieval using L2 distance:euclidien distance between 2 histograms

In mathematics, the Euclidean distance or Euclidean metric is the ordinary (i.e. straight-line) distance between two points in Euclidean space. With this distance, Euclidean space becomes a metric space. The associated norm is called the Euclidean no