但是，由于顾客向量的平均值很稀疏，算法的执行更倾向于接近o (M + N)。

However, because the average customer vector is extremely sparse, the algorithm's performance tends to be closer to o (m + n).

youdao

对于矩阵来说，MEAN (X)是包含了每列平均值的行向量。

For matrices, mean (X) is a row vector containing the mean value of each column.

youdao

顶点的法向量通常是包含这个顶点的所有三角形法向量的平均值。

The vertex normal is usually calculated as the average between the triangle normals of all triangles that include that vertex.

youdao