(for image):shape[0]: Height; shape[1]: Wide; shape[2]: channel 对于二维图片，shape【0】：图片高度；shape【1】：图片宽度；shape【2】：通道数； (for matrix): shape[0]: row; shape[1]:column; 对于矩阵而言：shape【0】：行数；shape【1】：列数；