import numpy as np
a=np.arange(20).reshape(4,-1)
# 保存文件
np.savetxt('a.csv',a,fmt="%d",delimiter=',')
# 加载文件
a1=np.loadtxt('a.csv',dtype=np.int64,delimiter=",")

import numpy as np
a=np.arange(20).reshape(4,-1)
# 保存文件
np.savetxt('a.csv',a,fmt="%d",delimiter=',')
# 加载文件
a1=np.loadtxt('a.csv',dtype=np.int64,delimiter=",")