RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation

[sunkymepro]

RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation

[sunkymepro]

I add the code 'kernel, kernel_flip = ctx.saved_tensors' before the code 'ctx.save_for_backward(kernel, kernel_flip)' in forward function of class BlurFunction.
And there occurs a new error:

ValueError: not enough values to unpack (expected 2, got 0)

It seems that the variable kernel and variable kernel_flip aren't saved successfully. I don't know why this problem occurs, is there anyone who can help me?

[rosinality]

Hmm I can't reproduce the error. And I don't have clue as inplace operations is not happened over these two tensors.

[sunkymepro]

Hmm I can't reproduce the error. And I don't have clue as inplace operations is not happened over these two tensors.

It may be because the version of cuda and cudnn are mismatch? I do experiment in a 3090 NVIDIA GPU and use torch 1.8.1 and cuda 11.2.

[rosinality]

Hmm, I use torch 1.8.1 and cuda 10.2. But I don't know cuda version could affect these kind of problems.

[superAa]

I have solved ，You can see that [(https://zhuanlan.zhihu.com/p/409117481)]