$$\text{均方误差}=\underset{我=1}{\overset{R}{{\displaystyle \sum }}}\frac{{(t_{我}-y_{我})}^2}{R},$$

$$\text{损失}=\frac{1}{2}\underset{我=1}{\overset{R}{{\displaystyle \sum }}}{(t_{我}-y_{我})}^2。$$

$$\text{损失}=\frac{1}{2}\underset{p=1}{\overset{HWC}{{\displaystyle \sum }}}{(t_p-y_p)}^2,$$

$$\text{损失}=\frac{1}{2\mathrm{年代}}\underset{我=1}{\overset{\mathrm{年代}}{{\displaystyle \sum }}}\underset{j=1}{\overset{R}{{\displaystyle \sum }}}{(t_{我j}-y_{我j})}^2,$$