a mistake has been found

[ForawardStar]

Hello! very great project, it gives me a lot help. But I think I found a mistake in model.py, line291, which is 'mupp, logvarpp = self.encoder(xp.detach())'. I suppose that 'xp' should not be detached when updating the parameters of decoder, since it would stop the gradient of backpropagation to decoder, or the generator. Does someone found the same mistake? Thanks, I have given a star.