Scipy.sparse矩阵的存储，读取和转化为稠密矩阵

import numpy as np
import scipy.sparse as sp

m = sp.lil_matrix((7329,7329))
np.save(path,m)   #用numpy的load方法存储矩阵，path为存储的路径

mat = np.load(path)[()] #读取存储的矩阵，注意[()]这个符号可以抽取对象

mat = mat.toarray() #将稀疏矩阵转为稠密矩阵