about var_loss

[LiuJF1226]

Dear authors, what is the purpose of the variable var_loss? I notice that you retain its gradient in the rendering process. But it seems that you don't use it after rendering.

[ForMyCat]

Ah thanks for pointing out. It was something we tested in the pass and we forgot to remove it. You can disregard it for now. I'll remove it in a future version.