【Numpy】行矩阵转列矩阵

使用.reshape(-1, 1)，如：

In [1]: import numpy as np

In [2]: arr = np.array([1,2,3,4,5])

In [3]: arr.reshape(-1, 1)
Out[3]:
array([[1],
       [2],
       [3],
       [4],
       [5]])

In [4]: