Negative lpips loss

[Kevin-thu]

Thanks for open-sourcing your great work.
I tried using elatentlpips as one of the loss function to train a generation model that directly generates vae latent, but found the lpips quickly dropped to negative value and continued dropping. Could you provide insights into the possible reasons for this issue?

[mingukkang]

It is very weird. Which latent space are you using, and have you tried performing overfitting experiments on it?