# Pp

* Level 5, 4:
$$
\mathcal{Loss}=\mathcal{L}_{MSE}
$$

* Level 3, 2, 1:
$$
\mathcal{Loss}=10\times\mathcal{L}_{MSE}+\mathcal{L}_{VGG19}
$$

* Level 0:
$$
\mathcal{Loss}=\mathcal{L}_{MSE}+\mathcal{L}_{VGG19}-0.4\times SSIM(pred, target)
$$