Distance by closeness
a numeric matrix where the distance is calculated by rows
For two rows in the matrix, assume x_1, x_2, ..., x_n1 are the column index of none-zero values in row 1 and y_1, y_2, ... y_n2 are the column index for non-zero values in row 2, the distance between the two rows based on the closeness is calculated as:
d_closeness = sum_i sum_j(|x_i - y_j|) / (n_1*n_2)
Zuguang Gu <firstname.lastname@example.org>
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