np.expand_dims(exist_row, axis=0) 拓展一个维度
np.tile(exist_row,(100, 1)) 将第0维复制100次，第1维复制1次
exist_row = np.array([1,2,3])
exist_row = exist_row.reshape(1,-1)
exist_row = np.expand_dims(exist_row, axis=0)
exist_row = np.tile(exist_row,(100, 1))
exist_row = np.expand_dims(exist_row, axis=0)
exist_row = np.tile(exist_row, (len(jk_list),1,1))
