numpy中轴的概念是可以认为是数组的维度的概念
a = np.arange(24).reshape(2,3,4) a array([[[ 0, 1, 2, 3], [ 4, 5, 6, 7], [ 8, 9, 10, 11]], [[12, 13, 14, 15], [16, 17, 18, 19], [20, 21, 22, 23]]]) np.max(a,axis=0) array([[12, 13, 14, 15], [16, 17, 18, 19], [20, 21, 22, 23]]) np.max(a,axis=1) array([[ 8, 9, 10, 11], [20, 21, 22, 23]]) np.max(a,axis=2) array([[ 3, 7, 11], [15, 19, 23]])