Design an algorithm to calculate any two of the string edit distance.
设计一个算法，计算任意两个字符串的编辑距离。
Compared to the 0-1 polynomial kernel, our newly designed string kernel based on edit distance can effectively measure the similarity between sequences.
相比先前基于0 - 1编码的多项式核，采用新的字符串核能较好地度量序列之间的相似度。
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