如何在python中有效地组合断开的csr矩阵？

import numpy as np
from scipy.sparse import csr_matrix, vstack

data1 = np.array([1, 2, 3])
indices1 = np.array([0, 2, 4])
indptr1 = np.array([0, 2, 3])
shape1 = (2, 3)

matrix1 = csr_matrix((data1, indices1, indptr1), shape=shape1)

data2 = np.array([4, 5, 6])
indices2 = np.array([0, 1, 2])
indptr2 = np.array([0, 1, 3])
shape2 = (1, 3)

matrix2 = csr_matrix((data2, indices2, indptr2), shape=shape2)

combined_matrix = vstack([matrix1, matrix2])