密集和稀疏向量
一个向量(1.0,0.0,3.0)它有2中表示的方法。
密集:[1.0,0.0,3.0] 其和一般的数组无异。
稀疏:(3,[0,2],[1.0,3.0]) 其表示的含义(向量大小,序号,值) 序号从0开始

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