scipy.sparse
scipy.sparse.bsr_matrix.toarray
scipy.sparse.bsr_matrix.tocoo
bsr_matrix.
tobsr
Convert this matrix into Block Sparse Row Format.
With copy=False, the data/indices may be shared between this matrix and the resultant bsr_matrix.
If blocksize=(R, C) is provided, it will be used for determining block size of the bsr_matrix.