1.删除列
column_to_delete = [0, 1, 2] arr = np.delete(arr, [0, 1, 2], axis=1)
2.归一化
arr = normalize(arr, axis=0, norm='max')
3.取某几列
column_to_get = [1, 3, 5]arr = np.array(arr[:, column_to_get], dtype=np.float)
