Improving Performance of Multiplication of Scipy Sparse Matrices

Question

Given a Scipy CSC Sparse matrix \"sm\" with dimensions (170k x 170k) with 440 million non-null points and a sparse CSC vector \"v\" (170k x 1) with a few non-null points, is the

Answer 1

Recently i had the same issue. I solved it like this.

def sparse_col_vec_dot(csc_mat, csc_vec):
    curr_mat = csc_mat.tocsr()
    ret curr_mat* csc_vec

The trick here is we have to make one version of the matrix as row representation and the other version as column representation.