python增加矩阵维度的实例讲解

>>> x = np.array([1,2])>>> x.shape(2,)>>> y = np.expand_dims(x, axis=0)>>> yarray([[1, 2]])>>> y.shape(1, 2)>>> y = np.expand_dims(x, axis=1) # Equivalent to x[:,newaxis]>>> yarray([[1],    [2]])>>> y.shape(2, 1)