Running into a gradient computation runtime error

[disturbed-mystic1]

RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation: [torch.cuda.FloatTensor [1, 512, 4, 4]] is at version 2; expected version 1 instead. Hint: the backtrace further above shows the operation that failed to compute its gradient. The variable in question was changed in there or anywhere later. Good luck!

Running into this error, while training

[railgun-zyy]

Metoo!!! so do you know how to solve it?

[railgun-zyy]

I've fixed the problem,
def backward(self, unet_loss, dis_loss):
dis_loss.backward(retain_graph=True)
unet_loss.backward()
self.dis_optimizer.step()
self.unet_optimizer.step()