包括随机梯度算法，相对梯度算法，可以广泛的应用于数据预测及数据分析,包括最后计算压缩图像的峰值信噪比和压缩效果的源码。- Including stochastic gradient algorithm, the relative gradient algorithm, Can be widely used in data analysis and forecast data, Including the final calculation of the compressed image peak